Calosota longivena

Description. FEMALE (Figs 15, 35). HOLOTYPE: length about 5.1 mm. Color. Head (Fig. 4) primarily dark but with slight purple, bluish or greenish lusters under some angles of light, including obscure greenish spot below anterior ocellus. Maxillary and labial palpi, antenna, and tegula dark. Mesoscutum and scutellar-axillar complex dark (Fig. 15) with slight purple, bluish or greenish lusters under different angles of light similar to head. Acropleuron dark with slight metallic lusters similar to mesonotum under some angles of light. Legs (Fig. 35) with femur and tibia of front leg extensively dark brown, but trochantellus, knee, tibia apically, and tarsus mostly yellowish; middle leg with trochantellus yellow, femur brown except apically, tibia mostly yellowish with more brownish tinge subbasally and more distinctly yellow basally and apically, and tarsus yellow; hind leg similar to middle leg except trochantellus yellow only ventrally and femur darker brown. Fore wing hyaline; setae uniformly brown. Gaster (Figs 15, 35) dark brown. Structure/setation. Head in dorsal view about 2× as wide as long, with IOD about 0.35× head width; IOD: MPOD: OOL: POL: LOL = 60: 14: 8: 18: 15; in frontal view about 1.2× as wide as high, with dorsal margin of torulus at level of lower orbits; malar space about 0.57× eye height. Head (Fig. 4) with frontovertex and parascrobal region meshlike reticulate to about level of dorsal limit of interantennal region, medially the reticulations tapered ventrally between dorsal limits of smooth and shiny scrobes; lower parascrobal region and interantennal region more meshlike coriaceous-reticulate; clypeal region microcoriaceous and paraclypeal region obliquely alutaceous-reticulate. Head with brownish setae on frontovertex and more conspicuous white setae on parascrobal region, interantennal region and lower face. Antenna (Figs 15, 35) with flagellum clavate; length of flagellum + pedicel about 1.6× head width; scape: pedicel: fu1–fu8: clava = 78(17): 30(11): 13(9), 22(10), 22(10), 23(10), 22(10), 19(10), 19(11), 18(12): 52(16). Mesoscutum (Fig. 15) meshlike reticulate, the reticulations somewhat larger medially than laterally where more similar to vertex, and with whitish, hairlike setae; anteroadmedian lines and notauli obscurely developed on inclined anterior surface and not extending posterodorsally; parapsidal lines more distinct lines of microsculpture. Axillae elongate-triangular, separated by about 3.5× own width. Scutellum low convex, about 1.15× as long as wide (dorsellum covering frenal area); meshlike reticulate, the reticulations anteromedially similar to lateral lobes but more elongate-reticulate laterally and posteriorly; with white setae. Mesopleuron with exposed, bare lower mesepimeron (cf. Fig. 55); acropleuron very shallowly and inconspicuously reticulate anterodorsally near tegula, but mostly meshlike coriaceous to obliquely coriaceous-alutaceous anterior to oblique microsculptured region and longitudinally coriaceous-alutaceous posteriorly. Fore wing (Fig. 62) with cc: mv: stv: pmv = 61: 41: 10: 14, and perpendicular distance between apex of stigmal vein and anterior margin of wing 1.1× length of stigmal vein; basal cell entirely setose; cubital area bare except anteriorly along mediocubital fold, including along posterior margin; disc uniformly setose, without distinct bare band adjacent to basal fold. Metacoxa setose along dorsal, ventral and basal margins, but outer surface broadly bare mediolongitudinally. Propodeum with callus setose to posterior margin; bare anteriorly between spiracle and foramen. Gaster (Figs 15, 35) about 2.2× as long as mesosoma; with white setae, the setae denser and more conspicuous laterally than dorsally; penultimate tergum with posterior margin extending to level of cerci; syntergum with medial length about 2.6× transcercal width, obviously compressed beyond cerci, and subequal in length to penultimate tergum. MALE. Unknown. Variation. Females vary in length from about 3.7−5.1 mm. The head sometimes has a more distinct green spot below the anterior ocellus and/or a reddish-coppery luster along the inner orbit ventral to the posterior ocellus, but only two specimens from Texas (Kerr, Sanderson) of 14 females have an obvious M-like coppery region below the anterior ocellus. The scape sometimes has a slight greenish luster, the mesoscutum has variably distinct reddish, bluish-green or purple lusters, and the meso- and metatibiae are sometimes more extensively dark brown medially than for the holotype. The marginal vein varies from about 3.6−4.2× the length of the stigmal vein, and fu1 from about 1.3−1.8× as long as wide. The penultimate tergum sometimes extends quite distinctly beyond the level of the cerci, and the syntergum varies from about 1.8−2.7× the transcercal width.

Distribution. Nearctic: southern USA east of New Mexico (Map 2).