Calyxochaetus hardyi
Creators: name: Runyon, Justin B.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Dolichopodidae
Calyxochaetus
Calyxochaetus hardyi

description: Calyxochaetus hardyi (Harmston & Knowlton)
(Figs 34, 52, 58, 71)
Sympycnus hardyi Harmston & Knowlton, 1940: 397.
Calyxochaetus hardyi: Pollet et al. (2004: 74).
Type material examined. HOLOTYPE ♂, labeled: “ Hooper, Ut./ VI- 15 [18?] -37”; “ D. Elmo Hardy / collector”; “Type No/ 54302/ USNM”; “HOLOTYPE/ Sympycnus / hardyi / n. sp. F.C.H. - G.F.K”; “ Sympycnus / hardyi H. & K./ Det. 1940 F.C. Harmston” (USNM).
Other material examined. USA: Arizona: Apache County: Springerville, 30.v.1972, W.W.Wirth (1♀, USNM); Cochise County: Southwestern Research Station, Portal, 23.v–5.vi.1967, Malaise, C.W. Sabrosky (1♂, USNM); same data except, 5–9.vi.1972, W.W. Wirth (1♂, USNM). Colorado: Larimer County: Fort Collins, 2.viii.1967, FCH (2♂, FSCA); same data except, 29.vi.1973 (1♂, FSCA). Nebraska: Keya Paha County: Burton, 16.vi.1959, FCH (1♂, FSCA); Knox County: Santee, 11.vi.1963, FCH (2♂, FSCA); Morrill County: Redington, 27.v.1963, FCH (6♂, FSCA; 2♂, LACM); Sioux County: Agate, 23.vii.1960, FCH (1♂, FSCA). New Mexico: Lincoln County: West of Capitan, 7.vi.1977, Knowlton & Hanson (1♂, LACM); Santa Fe County: Santa Fe, viii.1889 (1♂, USNM). South Dakota: Pennington County: Rapid City, 28.vii.1970, FCH (2♂, FSCA); Todd County: Rosebud, 1.vii.1964, FCH (1♂, FSCA); Yankton County: Yankton, 11.vi.1963, FCH (1♂, FSCA). Utah: Kane County: Johnson, 17.v.1940, G.F. Knowlton & FCH (1♂, LACM); Kanab, 17.v.1940, G.F. Knowlton & FCH (2♂, USNM); Sevier County: Richfield, 20.vii.1945, FCH (1♂, 1♀, CNC); Uintah County: Vernal, 19.vii.1950, FCH (2♂, FSCA); Weber County: Riverdale, 23.v.1940, G.F. Knowlton & FCH (4♂, MTEC); Ogden, 8.vi.1945 (4♂, 2♀, FSCA). Wyoming: Sweetwater County: Burntfork, 14.vii.1940, G.F. Knowlton & FCH (1♂, USNM).
Diagnosis. This is the only species in the C. cilifemoratus species group in which males lack long ventral setae on apical half of the hind femur (Fig. 52). The very small oval lamella on the arista-like stylus of males (Fig. 34) and conspicuously long calypteral setae distinguish this species from other species of Calyxochaetus.
Redescription. Male. Wing length 2.2–2.5 mm. Head: Frons with thick brown pruinosity that is only slightly thinner on either side of ocellar tubercle, not glabrous. Face silver, narrowly triangular, about 2 ommatidia wide at clypeus. Antenna (Fig. 34) dark brown; scape long, laterally flattened and wide, subequal to combined length of pedicel and postpedicel; postpedicel broadly oval, wider than long; arista-like stylus with apical lamella small and oval to elongate oval. Palpus small, oval, brown becoming yellow apically, with brown-yellow setulae. Thorax: Pleura dark brown with gray pruinosity; metepimeron concolorous with pleura, usually yellow just above hind coxa. Legs: Foreleg: Yellow with coxa sometimes brown at very base, tarsomere 1 narrowly brown apically, tarsus brown from apex of tarsomere 2. Tibia slender, without outstanding setae. Tarsus almost 2X tibia length. Tarsomere 1 very short, about as wide as long. Tarsomere 2 slightly bowed, nearly as long as tibia and subequal to combined length of tarsomeres 3–5, without long fine anterior setae at apex. Tarsomere 3 slightly shorter than tarsomere 4. Tarsomere 4 very slightly bowed, with slightly longer pale dorsal setulae on apical third. Tarsomere 5 dorsoventrally flattened, slightly wider than tarsomere 4. Midleg: Yellow, except coxa infuscated with yellow ground color visible, tarsus brown from apex of tarsomere 1. Tibia slender, very slightly bowed, without specialized setae. Tarsus slender, subequal to tibia length. Tarsomere 1 subequal to combined length of tarsomeres 2–5; apex with 1 long and 1 short fine curved yellow anterior setae. Tarsomere 2 with basal third weakly swollen, bearing 3 fine curved pale anterior setae. Tarsomeres 2–3 subequal in length, tarsomere 4 slightly shorter. Tarsomere 4 with a few slightly longer setae (subequal to tarsomere width) along anterior edge; long (subequal to tarsomere length) fine curved pale anterior seta at apex. Tarsomere 5 about half tarsomere 4 length, with long (subequal to tarsomere length) fine sinuous anterior seta at very base. Hindleg: Yellow, except coxa infuscated at base, femur faintly brown dorsoapically, tibia becoming brown apically, tarsus brown. Femur (Fig. 52) without long ventral setae, with row of very short anteroventral setae on distal half, with posterior preapical seta. Wing (Fig. 58): Posterior margin nearly straight and evenly widening from base to crossvein dm-m, without anal angle, widest part of wing just basal to apex of M 4. Distal section of M 4 about 4X longer than crossvein dm-m. Calypteral setae very long, subequal in length to fore coxa. Abdomen: Tergite 2 usually with lateral surface mostly yellow (mostly brown in 2 specimens). Tergite 3 usually yellow laterally, varying from mostly yellow to nearly brown. Tergite 4 usually brown, rarely yellow at base. Hypopygium: Cercus with narrow, finger-like, rather sclerotized apical lobe. Postgonite apical lobes narrow, apex rounded, light yellow.
Female. Wing length 2.4–2.6 mm. Similar to male except as follows: Head: Face wide, nearly parallel-sided but slightly narrowing to clypeus, gray. Clypeus light gray. Antenna with postpedicel short, wider than long, subrectangular, with flat apex; arista-like stylus unmodified but slightly blunted at apex. Palpus much larger, triangular, rounded apically, brown with slight gray pruinosity and yellow setulae and setae. Thorax: Proepimeron with 3 small white hairs. Legs: Unmodified, without specialized setae. Hind tibia yellow, becoming light brown near apex. Hind tarsomere 1 yellow on basal half. Wing: Elongate oval with posterior margin evenly rounded. Distal section of M 4 about 3X longer than crossvein dm-m. Calypteral setae longer than normal, subequal in length to halter. Abdomen: Tergite 2 mostly yellow laterally. Tergite 3 yellow at base.
Distribution and seasonal occurrence. Known from valley locations in Arizona, Colorado, New Mexico, Utah and southern Wyoming, and eastward into Nebraska and South Dakota (Fig. 71). Adults have been collected May through August.
description: Published as part of Runyon, Justin B., 2024, Revision of the genus Calyxochaetus Bigot (Diptera: Dolichopodidae: Sympycninae), pp. 1-74 in Zootaxa 5539 (1) on pages 29-30, DOI: 10.11646/zootaxa.5539.1.1, http://zenodo.org/record/14240426