Reprinted with permission from: Mitchell, T.B. 1962 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 152. |
FEMALE—Length 9-10 mm., breadth of abdomen 4 mm.; black, the mandibles reddish at base, testaceous on outer surface apically; antennal flagella brownish-piceous, legs more piceous, apical tarsal segments becoming testaceous, spurs pale yellow, tegulae yellowishhyaline; wings whitish-hyaline, veins testaceous to piceous; cheeks much narrower than eyes; clypeus quite flat, its median length about half the distance between eyes below; eyes very slightly convergent below; mandibles rather short, rounded apically; labrum broadly triangular and quite densely pubescent, its median length about half the basal width; basal segment of flagellum somewhat shorter than 2nd and 3rd combined; clypeus dull, quite coarsely and densely punctate, the supraclypeal and lateral areas of face somewhat more finely and less densely punctate, punctures becoming minute and sparse on each side above, quite coarse and close medially, surface shining between eyes and ocelli; cheeks very finely and closely punctate beneath quite dense pubescence; scutum shining, punctures quite coarse, close in general but somewhat separated in median area posteriorly, those on scutellum somewhat finer and uniformly close, almost contiguous; pleura coarsely, closely and deeply punctate; posterior face of propodeum shining, punctures rather fine, irregularly scattered and sparse, dorsal area dull, obscurely rugose along upper margin, lateral faces quite closely and deeply punctate; abdominal terga finely and closely punctate beneath dense tomentum; pygidium elongate triangular, apex rather narrowly rounded; pubescence entirely white, rather short but copious and dense on head and thorax; legs largely white pubescent, outer surfaces of front and mid tibiae densely white tomentose, becoming somewhat yellowish at apex, basitarsi with yellowish pubescence beneath; hind tibial scopa white, hairs rather sparsely plumose; basal abdominal tergum somewhat more thinly covered with elongate greyish-white pubescence, apical margin narrowly yellow, following terga densely and completely white tomentose, hiding the surface, apical margins of the terga apparently narrowly yellow apically, faintly evident through the tomentum; apical margin of tergum S becoming yellowish tomentose medially; tergum 6 with yellowish-brown pubescence on each side of pygidium.
MALE—Length 8 mm., breadth of abdomen 3.5 mm.; black, the clypeus and labrum entirely bright yellow, and mandibles yellow at base; antennal flagellum brownish-testaceous beneath, piceous above; legs chiefly black, but apical tarsal segments becoming brownishtestaceous, spurs pale yellow; tegulae yellowish-hyaline, wings whitish-hyaline, veins yellowish to piceous; apical margins of abdominal terga narrowly yellowish-hyaline; cheeks much narrower than eyes; clypeus quite flat, its median length about half the distance between eyes below; eyes slightly convergent below; mandibles short, simple; labrum rather broadly rounded, its median length about half the basal width, densely covered with pubescence, hiding the surface; tergum 6 with a triangular apical process on each extreme side; clypeus quite coarsely and closely punctate, punctures rather vague on the yellow surface; supraclypeal area rather closely punctate, lateral areas of face below antennae very finely and closely punctate, punctures becoming minute and quite sparse above laterally, but deep, distinct and relatively coarse medially, surface shining between eyes and ocelli; cheeks somewhat shining, punctures close and fine; scutum somewhat shining between quite coarse and rather close punctures, these more distinctly separated medially over posterior half; scutellum with somewhat finer, quite crowded punctures; pleura quite coarsely and closely punctate throughout; propodeum rather dull, quite closely and rather coarsely punctate, becoming more finely rugose on dorsal area laterally, and lateral surfaces very finely and closely punctate; basal abdominal tergum quite deeply and rather coarsely punctate toward base, punctures slightly separated, becoming finer and closer laterally and toward apical margin; following terga uniformly, finely and closely punctate beneath the tomentuni; pubescence of head, thorax and legs rather short but dense and copious, entirely white, that on basal abdominal terguni rather thin but more elongate and erect, following terga with dense white tomentum; margins of pygidial plate carina.te, convergent apically, apex rather narrowly rounded; sterna 7 and 8 and genital armature as shown (fig. 86).
DISTRIBUTION—Colorado and Texas to Illinois, June and July.
FLOWER RECORD—Robertson (1929) records this species on Petcaostemum purpureum.