Eucera texana (Timberlake, 1969)
  Apoidea   Apidae   Eucera
Subgenus: Synhalonia

IDnature guide
Extracted from: Timberlake P.H., (1969). A Contribution to the Systematics of North America Species of Synhalonia (Hymenoptera, Apoidea). University of California Publications in Entomology Volume 57

The male of texana has genital armature and apical sternites very similar to the same parts of illinoensis, but is easily distinguished by having the labrum and supraclypeal area entirely dark, by distinct light hair bands on abdomen, and by the third antennal joint less than half as long as the fourth.

Male.óBlack; apical joint of tarsi and claws ferruginous; tibial spurs pale testaceous. Tegu-lae fuscous, but reddened at apex. Wings dusky hyaline, nervures piceous, subcosta black. Pubescence of head and thorax rather long, moderately dense, ochreous on notum, and paler beneath and on face. Hair of tergite 1 long and white, and that of tergite 2 short and white, with narrow band of black at apex. Tergites 3 to 5 with apical white band of appressed, feathered hair, that on tergite 3 a little broader than other two and followed by a line of black hairs. Base of tergites 3 to 6 with rather thin, short black hair, apical band on 6 white with overlying ochreous hairs. Hair on tergite 7 and across disk of sternite 5 dark brown or fuscous, the ventral fringes otherwise white. Hair of legs white, ferruginous on inner side of basitarsi.

Head much broader than long; inner orbits of eyes moderately divergent above. Vertex hardly impressed on each side, but ocellar region slightly raised; lateral ocelli their distance apart from nearest eye and their diameter from occipital margin. Proboscis rather long, shining, and almost hairless. Antennae slender, flagellum hardly compressed, probably reaching apex of tergite 2 (3 apical joints missing) ; joint 3 distinctly longer than wide and about two-fifths as long as joint 4. Clypeus moderately shining, with close, small punctures. Frons, vertex, and mesonotum dull, densely punctured, punctures about like those on clypeus and becoming more separated on posterior middle of scutum. Abdomen shining, minutely and densely punctured, but apical margin of tergites 1 to 6 narrowly bare and impunctate. Lateral carinae of tergite 6 terminating in acute tooth. Sternite 6 with rather broad, rounded impression on lateral margins, terminating in small, rounded marginal lobes, and followed by low ridge paralleling margin for short distance; disk duller than usual, with patch of short, erect, and moderately dense hair covering median part of basal half, and submarginal row of longer hair on each side of apical margin. Sternites 7 and 8 as figured. Parameral lobes of genital armature, as in illinoensis, being almost straight, moderately dilated at base and apex, with inner corner of apex more rounded than outer; pubescence on outer face short, thin, and nearly restricted to basal expansion. Length about 12 mm, anterior wing 9 mm, width of abdomen 4.4 mm.

Scientific source:

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