Lebiini
Creators: name: Erwin, Terry L.
Publisher: name: Zenodo
Year: 2004
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae

description: Key to the Costa Rican Groups of Subtribe Agrina (Lebiini) and the Neotropical genera of the Plochionida Group
(Modified in part from Erwin, Kavanaugh & Moore 2004)
1 Elytron at basal third depressed, surface uneven, tuberculate or not, and/or margin of pronotum angulate or subangulate at mid­lateral setiferous pore ................................ ...................................................................................................... Cryptobatida Group
1’ Elytron neither depressed nor tuberculate, surface smooth with normal interneurs and intervals(or interneurs effaced); side of pronotum nearly straight or evenlyrounded ................................................................................................................................... 2
2(1’) Antennae short, barely extended to level of humerus. Head and neck robust, mandible robust, scrobe large, lower margin markedly flanged; ligula quadrisetose ........... ............................................................................................ Plochionida Group ... 4
2’ Antennae longer, extended well­passed level of humerus. Head small to moderately robust, neck narrow, mandible small, scrobe moderate sized, lower margin slightly too moderately flanged; ligula quadrisetose ............................................................ 3
3(2’) Pronotum tubular, elongate, with beaded margins; head with long occiput and well developed gena; antennomere 3 with apical ring of setae and pubescence ................ ...................................................................... Agrida Group ... Agra Fabricius 1801
3’ Pronotum quadrate or rectangulate with lateral margins explanate; head with short occiput, gena present or absent, if present then short; antennomere 3 with apical ring of setae only ...................... Calleidida Group ... Calleida Latreille & Dejean 1824
4(2) Antennomere 4 mostly pubescent. Tarsomere 4 markedly bilobed. Ultimate labial palpomere slightly depressed, subequal in size to that of ultimate maxillary palpomere (Figs. 1 –6) ............................................................................. Epikastea Liebke 1936
4’ Antennomere 4 with pubescence restricted to distal half or third. Tarsomere 4 triangulate, emarginate or moderately bilobed; ultimate labial palpomere securiform or subsecuriform, wider and shorter than that of ultimate maxillary palpomere ......... 5
5(4’) Mentum without dentiform projection on anterior margin, margin moderately produced as short and wide truncate projection; elytral intervals markedly convex, interneurs markedly and densely punctate ... (Fig. 11). Phacocerus Chaudoir 1872
5’ Mentum with well developed dentiform projection on anterior margin; elytral intervals flat or slightly convex, interneurs not or very finely and sparsely punctate ..... 6
6(5’) Pronotum narrowly cordiform, base only slightly broader than head across eyes; body form short and robust; penultimate hind tarsomere triangulate; labrum with anterior margin moderately v­cleft ... (Fig. 9) ...................... Amelus Chaudoir 1872
6’ Pronotum quadrate or broadly cordiform (semicircular), if the latter base much
broader than head across eyes; labrum with anterior margin entire, or very slightly emarginate at most .................................................................................................... 7 7(6’) Body form markedly broad; pronotum broadly cordiform (semicircular), base much broader than head across eyes; penultimate hind tarsomere deeply emarginate, moderately bilobed ... (Fig. 10) ................................................. Menidius Chaudoir 1872
7’ Body form narrow, elongate; pronotum quadrate, side margin slightly sinuate, base only slightly broader that head across eyes; penultimate hind tarsomere emarginate (Figs. 7, 8) ........................................................................ Plochionus Dejean 1821
description: Published as part of Erwin, Terry L., 2004, The beetle family Carabidae of Costa Rica: The genus Epikastea Liebke of the Plochonida Group, with new Neotropical species and notes on their way of life (Insecta: Coleoptera, Lebiini, Agrina), pp. 1-20 in Zootaxa 790 on pages 5-6, DOI: 10.5281/zenodo.158726