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© Copyright Laurence Packer 2014
· 7
Eucera atriventris MALE CF |
© Mary Paul
· 1
Eucera atriventris, male, top |
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© Mary Paul
· 1
Eucera atriventris, male, side |
© Mary Paul
· 1
Eucera atriventris, male, face |
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© Mary Paul
· 1
Eucera atriventris, female, top |
© Mary Paul
· 1
Eucera atriventris, female, side |
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© Mary Paul
· 1
Eucera atriventris, female, face |
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Overview |
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 13-15.5 mm., breadth of abdomen 5-6 mm.; black, the legs largely black, spurs testaceous, tegulae brownish-piceous; wings lightly infuscated, veins piceous to black, 2nd recurrent vein reaching 3rd submarginal cell much nearer apex than 1st does to apex of 2nd submarginal; cheeks slightly narrower than eyes; clypeus strongly protuberant, its median length somewhat greater than half the distance between eyes (fig. 87) eyes subparallel; mandibles simple; basal segment of flagellum only slightly shorter than segments 2 and 3 combined; punctures of clypeus rather coarse, distinctly but not widely separated; punctures on labrum close medially, becoming very sparse laterally; supraclypeal area rather dull, sparsely punctate, surface laterally rather dull, with well separated, rather fine punctures, becoming more shining above where punctures become relatively close, but with a shining, impunctate area laterad of each lateral ocellus; cheeks rather dull, very finely, closely and obscurely punctate; scutum dull, punctures shallow but rather coarse, quite sparse in a median area of disc posteriorly; scutellum more shining, punctures fine, distinct, rather close and regular; pleura dull, very finely and closely punctate except along anterior margin where surface is shining and punctures obsolescent; posterior face of propodeum somewhat shining, punctures very fine, shallow and vague, lateral faces dull and tessellate, rather closely punctate posteriorly, the punctures becoming obsolescent anteriorly and below; dorsal surface of basal abdominal tergum rather coarsely and shallowly punctate medially, punctures well separated but hardly sparse, becoming finer but deeper and more distinct, very close at each side, apical margin rather broadly impunctate; apical impressed areas of terga 2-5 very finely and closely punctate, only the very narrow apical rims on 2 and 3 impunctate; pygidium triangular, with rather narrowly rounded apex; pubescence long and copious, entirely pale ochraceous on head and thorax, legs largely pale pubescent basally, becoming fuscous or blackish on the more apical segments, hind tibial scopa black; basal abdominal tergum with copious, elongate, pale ochraceous pubescence basally, disc apically with very short, suberect, fuscous or blackish pubescence evident on each side, median area largely bare; discs of remaining terga rather densely covered across base with short, suberect, blackish pubescence, this becoming much shorter and thinner on impressed areas of 2 and 3, with some more elongate, erect hairs on discs of the following terga.
MALE—Length 13-15 mm., breadth of abdomen 5-5.5 mm.; black, clypeus and labrum yellow, upper margin of clypeus narrowly invaded with black, and lateral and apical margins of labrum narrowly darkened; mandibles somewhat yellowish apically; apical tarsal segments becoming brownish-testaceous, spurs testaceous, tegulae piceous; wings subhyaline, veins testaceous to piceous, the 2nd recurrent vein reaching 3rd submarginal cell much nearer apex than 1st recurrent does to apex of 2nd submarginal; cheeks subequal to eyes in width; clypeus strongly protuberant, its median length somewhat greater than half the distance between eyes (fig. 87); eyes sub- parallel; mandibles obscurely bi-dentate apically, but this often inevident due to wear; basal segment of flagellum fully twice as long as pedicel, and segment 2 three times longer than first; tibial spurs straight and simple; punctures of clypeus rather coarse and evenly distributed, slightly separated, those on labrum finer and closer medially, becoming very sparse laterally; supraclypeal area dull but rather smooth, sparsely punctate, surface on each side below level of antennae dull and tessellate, punctures fine and well separated, somewhat coarser and closer above antennae; cheeks rather smooth but dull, punctures exceedingly minute and obscure; scutum dull, punctures rather shallow and coarse, slightly separated in center of disc posteriorly, becoming much finer and closer laterally and anteriorly; scutellum somewhat shining anteriorly, punctures rather fine, slightly separated, surface finely rugose along posterior margin; pleura dull, very finely and quite closely punctate; posterior face of propodeum rather dull, punctures very fine, shallow and obscure, the dorsal triangle becoming shallowly rugose along upper margin, lateral faces dull, very finely and obscurely punctate; punctures of abdominal terga shallow, rather fine and quite close in general, well separated medially on the more basal terga, becoming very close laterally and much closer on the more apical terga, the apical impressed areas finely and somewhat more sparsely punctate, with only the narrow apical rims impunctate; pubescence of head and thorax very long and copious, entirely pale ochraceous to whitish, and legs largely pale pubescent; basal abdominal tergum with copious, elongate, pale ochraceous pubescence basally, but with some darker pubescence apically, visible on each side; following terga entirely covered with short, erect, rather copious but thin, fuscous or blackish pubescence, that on 6 becoming somewhat paler, with some long pale hairs at each side; median length of pygidial plate considerably greater than basal width, margins carinate, nearly parallel, slightly but abruptly constricted near the subtruncate, rather broad apex; sterna 7 and 8 (fig. 89) and genital armature (fig. 88) as shown.
DISTRIBUTION—Minnesota to Pennsylvania, south to Georgia, March to July.
FLOWER RECORDS — Aesculus, Lupinus, Mertensia, Robinia and Vicia. Robertson (1929) records atriventris (as T. robertsonhi) on Astragalus mexicanus.
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Identification | |
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
Smith described atriventris from a male and recorded the habitat as North America with a question mark.
In 1897 Robertson confused two species under this name, the female of one having the hair of the hind legs black, and the other having the hair fulvous. In 1905 he rejected the name atriventris, proposed to call the former species fuscipes, and recognized that the latter was Cresson's dubitata. He failed to distinguish the males, although he probably had both species, and used the name dubitata for this sex.
Cockerell, on the other hand, believing that dubitata was a Melissodes, continued to employ the name atriventris for the female with fulvous hair on the hind legs and described the dark-haired female asrobertsoni.
This species is common in the eastern part of the United States, with its identity now well established. Mitchell (1962) has given its distribution from Minnesota to Pennsylvania, south to Georgia.
Extracted from: Charles Robertson (1900). Some Illinois Bees. Trans. Acad. Sci. Of st. Louis.
Male. Differs from the normal from (S. dubilata Cr. female) in having the tibiae and metatarsi, especially the scopae of hind legs, fuscous or blackish.
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Updated: 2024-04-24 18:10:08 gmt
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