Lathrolestes
Creators: name: Reshchikov, Alexey V.
name: Soper, Anna
name: Van, Roy G.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Lathrolestes

description: Key to Nearctic species of Lathrolestes
1. Occipital carina complete dorsally .............................................................................................................................. 2
-. Occipital carina incomplete dorsally ......................................................................................................................... 24
2. Propodeum without carinae or only area petiolaris present. Clypeus towards apex projecting strongly anteriorly. 21
-. Propodeum with carinae more or less complete (Figs 31–36). Clypeus towards apex not strongly projecting anteriorly ............................................................................................................................................................................... 3
3. Face and clypeus separated by a transverse impression or not separated (Figs 53–56) ............................................. 4
-. Face and clypeus separated by a transverse suture or sharp groove (Fig. 57 a) ......................................................... 14
4. Antennal flagellum with median articles white. Ovipositor straight, without notch (Fig. 14) ................................... 5
-. Antennal flagellum with articles uniformly colored. Ovipositor straight (Figs 3, 4, 9) or with shallow notch (Figs 6, 8) .................................................................................................................................................................................. 6
5. Face smooth, not sculptured, punctures weak. Forewing infuscate. Propodeal carinae complete, except costula absent, carinae not strongly raised ......................................................................................... L. erugatus Barron, 1994
-. Face sculptured. Forewing not infuscate. Propodeal carinae complete, strongly raised .... L. asperatus Barron, 1994
6. Lower part of mesopleuron, mat, shagreen or rugose, not punctate. If ovipositor with shallow notch, its apical part to basal part ratio 0.35 (Fig. 6) ......................................................................................................................................... 7
-. Lower part of mesopleuron shiny, distinctly punctate, with distinct sparse deep punctures. If ovipositor with shallow notch, its apical part to basal part ratio 0.5 (Fig. 8) .................................................................................................. 11
7. Tarsal claws pectinate (Figs 41, 42) ............................................................................................................................ 8
-. Tarsal claws short, strongly curved at apex, with one basal tooth or basal lobe (Fig. 43, 44) .................................. 10
8. Ovipositor with shallow notch (Fig. 6)........................................................ L. scutellatus (Ashmead, 1890) stat. rev.
-. Ovipositor without notch (Fig. 1, 2) ........................................................................................................................... 9
9. Ovipositor not stout dorsally (Fig. 1); mesosoma not wide, with mesopleuron not projecting; area superomedia elongate (Fig. 31); 2nd metasomal tergum almost as wide as long, with superficial sculpture ........................................... ...................................................................................................................................... L. syringe Reshchikov sp. nov.
-. Ovipositor stout dorsally (Fig. 2); mesosoma rather wide, with projecting mesopleuron; area superomedia as long as wide (Fig. 32); 2nd metasomal tergum transverse, polished ...................................... L. barroni Reshchikov sp. nov.
10. Costula absent (Fig. 33). First metasomal tergum without median longitudinal carinae and projections at spiracles, evenly granulate, except that basal part of petiole is polished with a longitudinal groove (Fig. 37). Apical margin of male subgenital plate notched (Fig. 40). Face with bulge (Fig. 55 a). Lower part of mesopleuron without punctures, mat, shagreen. Tarsal claws with preapical teeth (Fig. 43). Body from uniformly yellow-pale to dark with pale spots on mesolpeuron and metasoma (Fig. 55 b) ..................................................................... L. fissus Reshchikov sp. nov.
-. Costula present (Fig. 34). First metasomal tergum with projections at spiracle and median longitudinal carinae, entirely granulate, without basal polished part (Fig. 38). Apical margin of male subgenital plate without notch. Face without bulge. Lower part of mesopleuron rugose. Tarsal claws with basal lobe (Fig. 44). Body black with black mesopleuron and reddish-yellow face and maculae on sides of metasomal tergum (Fig. 56 b) .................................... ................................................................................................................................... L. thomsoni Reshchikov sp. nov.
11. Face with punctures deeply impressed. Head not narrowed behind the eyes, long. Tarsal claws with teeth distinctly separated (Fig. 46). Ovipositor straight and thin, without notch (Fig. 9) ............................. L. platynus (Davis, 1897)
-. Face with punctures shallowly impressed. Ovipositor with notch (Figs 8, 23)......................................................... 12
12. Propodeum with area petiolaris and area superomedia confluent. Body black ........................ L. planus Barron, 1994
-. Propodeum with area petiolaris and area superomedia separate by apical transverse carina. Body black or reddishyellow, mostly reddish-yellow or mostly black with yellow metasoma .................................................................... 13
13. Body of female uniformly reddish-yellow, of male reddish-yellow tinged reddish-brown and black. Head narrowed behind the eyes. Propodeum with carinae complete. Clypeus and face separated by impression ................................. ........................................................................................................................................... L. obscurellus (Davis, 1897)
-. Body reddish-yellow and black, dorsally mostly black or dark reddish-brown, ventrally mostly reddish-yellow. Head not narrowed behind the eyes; Propodeum with carinae complete, except costula absent. Clypeus and face confluent, not separated by a groove or impression .................................................................. L. luteolator (Gravenhorst, 1829)
14. Propodeum with carinae complete, costula present (Fig. 36). 5th article of tarsus enlarged (Fig. 52) ......................... ......................................................................................................................................... L. zeugophorae Barron, 1994
-. Propodeum with carinae incomplete (Fig. 35). 5th article of tarsus not enlarged or only slightly enlarged (except L. mnemonicae) (Fig. 51) ............................................................................................................................................... 15
15. Face and clypeus separated by transverse distinct groove.......................................................................................... 16
-. Face and clypeus separated by a transverse suture .................................................................................................... 18
16. Head with yellow maculae (Fig. 58 a). Tarsal claws with preapical teeth or basal lobe (Figs 47–50) ...................... 17
-. Head black. Tarsal claws pectinate with three teeth (Fig. 45). Area basalis and area superomedia present; costula absent (Fig. 35). 2nd metasomal tergum reddish (Fig. 57 b) .......................................... L soperi Reshchikov sp. nov.
17. Tarsal claws with two preapical teeth, one of them apically cloven (Fig. 49). Area basalis and area superomedia distinct but confluent ................................................................................................................. L. dentatus Barron, 1994
-. Tarsal claws with basal lobe (Fig. 47). Area basalis and area superomedia not defined................................................ ....................................................................................................................................... L. nigricollis (Thomson, 1883)
18. Tarsal claws with one preapical tooth or teeth (Figs 48, 50). Body small, 3.0–4.0 mm............................................ 19
-. Tarsal claws pectinate or not pectinate, without preapical tooth. Body medium or large size, 4.0–7.0 mm............. 20
19. Ovipositor curved up (Fig. 24). Tarsi each with 5th article enlarged. Tarsal claws with two preapical teeth (Fig. 48). Occiput at middle acute. Parameres longer then aedeagus. Body dark reddish-brown to black .................................... ..................................................................................................................................... L. mnemonicae (Rohwer, 1914)
-. Ovipositor straight (Fig. 10). Tarsi each with 5th article not enlarged. Tarsal claws with one preapical tooth (Fig. 50). Occiput at middle obtuse. Parameres very short, much shorter then aedeagus, broad medianly. Body mostly reddishbrown ..................................................................................................................................... L. clavipes Barron, 1994
20. Body black with reddish-yellow maculae. Antennal flagellum dark reddish-brown. Clypeus slightly projecting anteriorly. Ovipositor straight (Fig. 11). Body medium size, 4.0 mm....................................... L. euryremus Barron, 1994
-. Body uniformly reddish-yellow or reddish-yellow with black maculae. Antennal flagellum in basal half dark reddish-brown, in apical half pale yellow. Clypeus strongly projecting anteriorly. Body large, 6.0–7.0 mm..................... ............................................................................................................................................... L. protrusus Barron, 1994
21. Occipital carina intercepting hypostomal carinae before base of mandible. Propodeum with carinae absent. Ovipositor with notch and cavity at apex of lower valvae (Fig. 12) ................................................... L. protenus Barron, 1994
-. Occipital carina intercepting hypostomal carinae at base of mandible. Propodeum with carinae partly complete. Ovipositor without notch (Figs 7, 13) ............................................................................................................................. 22
22. Clypeus not separate from face by a transverse groove or impression. Propodeum with area petiolaris defined. Nervellus intercepted slightly below middle. Face, mesopleuron and propodeum roughly rugose, with punctures shallowly impressed. Ovipositor without notch, stout at base (Fig. 13) ....................... L. tomostethi (Cushman, 1935)
-. Clypeus distinctly separate from face by a transverse groove. Propodeum with area petiolaris and apical transverse carina distinctly defined. Nervellus intercepted far below middle. Face, mesopleuron and propodeum granulated, with punctures deeply impressed ................................................................................................................................ 23
23. Metasomal terga smooth, punctures large, deeply impressed. Body black, except face and clypeus of males yellow. Ovipositor short, straight and swollen, without teeth (Fig. 7) ............................................ L. breviremus Barron, 1994
-. Metasomal terga granulate, punctures shallow, slightly impressed. Body black with reddish-yellow maculae. Metasomal terga of females red, except first tergum black, reddish-yellow at apex, that of males black, except second and third terga with broad pale yellow transverse macula. Ovipositor long (Fig. 15 b), longer than metasoma, with apical teeth (Fig. 15 a) ...................................................................................................................... L. ensator (Brauns, 1898)
24. Propodeum with carinae incomplete, area petiolaris and rarely remnants of area superomedia at sides present. Subgenital plate of female large. Ovipositor very short, shorter than height of metasoma (Figs 17, 18) ....................... 26
-. Propodeum with more nearly carinae complete, except costula absent or with only area petiolaris, apical transverse carina, and area superomedia in apical part defined. Subgenital plate of female not large. Ovipositor as long as height of metasoma (Figs 27–30) .............................................................................................................................. 25
25. Clypeus with apical margin subtruncate; at apex projecting slightly anteriorly. Propodeum with carinae complete, except costula absent. Head, mesosoma black, metasomal terga mostly reddish-yellow. Face and clypeus of males black ........................................................................................................................... L. constrictus (Provancher, 1882)
-. Clypeus of females with apical margin at middle strongly concave, that of males less strongly; at apex projecting strongly anteriorly. Propodeum with carinae incomplete, except area petiolaris, apical transverse carina, and area superomedia in apical part defined. Body black, legs reddish-yellow. Face and clypeus of males yellow....................
............................................................................................................................................ L. profenusae Barron, 1994 26. Face very convex, with distinct bulge at middle. Tarsal claws pictinate................................................................... 27
-. Face in dorsolateral profile flat or moderately convex. Tarsal claws each with teeth or pictinate, if pictinate and face moderately convex ovipositor as long as three first terga of metasoma, with apical teeth, or mesosoma reddish-yellow, or parameres of males very broad ...................................................................................................................... 30
27. First metasomal tergum with deep median longitudinal groove from base to near apex. Clypeus of females at apical margin on each side with distinct “tooth-like projection. Propodeum with area petiolaris obscurely defined ............. .................................................................................................................................................. L. messae Barron, 1994
-. First metasomal tergum with shallow median longitudinal impression from base to near apex. Clypeus of females at apical margin on each side without distinct “tooth-like projection. Propodeum with area petiolaris distinctly defined .................................................................................................................................................................................... 28
28. Face at middle smooth, with shallow punctures. Head black, clypeus at apex reddish-brown. Mesosoma entirely black ........................................................................................................................................ L. bullatus Barron, 1994
-. Face at middle granulate. Head of females reddish-yellow with black maculae or black with face, clypeus, orbits reddish-yellow maculae. Head of males pale yellow with vertex, frons at middle black or head black with face, clypeus, orbits, genae reddish-yellow. Mesosoma mostly pale yellow or black with reddish-yellow maculae. [Ovipositor without notch (Figs 27, 28)] ......................................................................................................................... 29
29. Mesopleuron smooth. Head of females reddish-yellow with black maculae; that of males pale yellow with vertex, frons at middle black. Mesosoma of females black with reddish-yellow maculae, that of males pale yellow, in part black. Metasomal terga of females reddish-brown, first tergum black, second, third, fourth terga in part reddish-yellow. Metasomal terga of males dark reddish-brown, in part reddish-yellow ........................ L. gibbosus Barron, 1994
-. Mesopleuron granulate. Head of females and males black with yellow or reddish-yellow maculae. Metasomal terga of females and males black, third tergum of males at base reddish-yellow ........................... L. pictus Cushman, 1933
30. Face flat...................................................................................................................................................................... 31
-. Face moderately convex ............................................................................................................................................ 33
31. Body color uniformly reddish-yellow. Ovipositor straight and not thin in apical part (Fig. 19).................................... ............................................................................................................................................ L. ochraceus Barron, 1994
-. Body color black and reddish-yellow. Ovipositor thin in apical part and slightly angular bent (Figs 20, 21)........... 32
32. Clypeus not separate from face. Females black and reddish-yellow; head, propodeum, metasomal terga mostly black; mesosoma mostly reddish-yellow. Males with head and mesosoma mostly very pale yellow, almost white; metasomal terga mostly black, with pale transverse bands ................................................. L. carinatus Barron, 1994
-. Clypeus separate from face by transverse impression. Females black; third and fourth metasomal terga reddishbrown. Males black with extensive yellow maculae; head mostly yellow, upper face, vertex black; mesosoma dorsally black, laterally and ventrally mostly yellow; metasomal terga black, third and fourth terga reddish-brown ....... .................................................................................................................................................. L. bulbus Barron, 1994
33. Tarsal claws pectinate ................................................................................................................................................ 34
-. Tarsal claws each with teeth (as at Figs 48–50)......................................................................................................... 36
34. First metasomal tergum with median longitudinal shallow impression from base to near apex. Parameres of males not modified, narrow .................................................................................................................................................. 35
-. First metasomal tergum with deep median longitudinal groove from base to near apex. Parameres of males modified, very broad ................................................................................................................................ L. striatus Barron, 1994
35. Ovipositor as long as three first terga of metasoma (Fig. 16 b), with apical teeth (Fig. 16 a). Mesosoma mostly black .............................................................................. L. caudatus (Thomson, 1883) (= L. nasoni Davis, 1897 syn. nov.)
-. Ovipositor shorter, without apical teeth (Fig. 22). Mesosoma reddish-yellow .................. L. periclistae Barron, 1994
36. First metasomal tergum with distinct median longitudinal groove from base to near apex; between lateral longitudinal carina and groove, proximad spiracle, with distinct impression. Ovipositor with notch (Fig. 25)........................... .................................................................................................................................................. L. aquilus Barron, 1994
-. First metasomal tergum with shallow median impression, without median longitudinal carinae. Ovipositor with notch or without notch (Figs 26, 30).......................................................................................................................... 37
37. Ovipositor with notch (Fig. 26). Tarsal claws with two or three distinct teeth. Body of female mostly black. Head black, clypeus at apex, orbits reddish-brown. Metasomal terga black, third tergum in part yellow tinged reddish. Male with body dorsally mostly black, ventrally mostly yellow. Head black, face, orbits, clypeus yellow. Mesosoma black with yellow maculae. Metasomal terga black, apical terga in part yellow tinged reddish ................................... ............................................................................................................................................... L. convexus Barron, 1994
-. Ovipositor without notch (Fig. 30). Tarsal claws with three fine teeth. Body of female and male black and reddishyellow. Head reddish-yellow, vertex, occiput, temple in part black. Metasomal terga reddish-yellow, first tergum at base black ................................................................................................................... L. truncatus (Provancher, 1888)
description: Published as part of Reshchikov, Alexey V., Soper, Anna & Van, Roy G., 2010, Review and key to Nearctic Lathrolestes Förster (Hymenoptera: Ichneumonidae), with special reference to species attacking leaf mining tenthredinid sawflies in Betula Linnaeus (Betulaceae), pp. 1-17 in Zootaxa 2614 on pages 4-6, DOI: 10.5281/zenodo.197875