Extracted with permission from: Onuferko, T.M. 2017. Cleptoparasitic Bees of the Genus Epeolus Latreille (Hymenoptera: Apidae) in Canada. Canadian Journal of Arthropod Identification No. 30: March 30, 2017. doi:10.3752/cjai.2017.30
Diagnosis. Epeolus bifasciatus is unmistakeable among
Canadian species of the genus, and both sexes can be readily
identified by each of the following features that is diagnostic for
the species in Canada: frontal area with pair of conspicuous
granulose protrusions, each located near upper mesal margin
of compound eye; punctures dense, but those of head and
mesosoma sparser in some areas, larger, deep, and distinct;
dorsal surface of pronotum long and distinctly angulate on
anterior margin; mesoscutum without pale tomentum; and
bright yellow tomentum on dorsal surface of mesosoma and
Distribution in Canada: Central Canada (Map 4).
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 7-8 mm.; black, basal segments of antennae testaceous, segments 2 and beyond of flagellum more brownish-piceous; mandibles and labrum more reddish; legs testaceous, hind spurs piceous, mid spurs somewhat darker, the front spurs pale testaceous; pronotum, tubercles, tegulae, scutellum and axillae reddish-testaceous, and disc of basal abdominal tergum more or less red beneath the tomentum; lateral ocelli separated from margin of vertex by a space somewhat greater than their diameter; cheeks very narrow, hind margin carinate, strongly narrowed below; median length of labrum slightly less than basal width, apical tubercles very low and inconspicuous; inner margin of mandibles with a very low and inconspicuous, submedian angle; scutellum rather evenly rounded posteriorly, axillae robust, tips rather strongly divergent from sides of scutellum, lateral margins subcarinate (fig. 110); wings with the usual three submarginal cells, quite deeply infuscated, veins brownish-piceous; pubescence in general very short and inconspicuous, venter of thorax with a small amount of dense, white tomentum along mid-line; pronotum densely covered with bright yellow, appressed tomentum; disc of basal abdominal tergum largely covered with dense yellow tomentum, and tergum 2 yellow tomentose across the apical impressed area, the more apical terga not fasciate; a dense, transverse band of cream- colored tomentum on metanotum just below scutellum; punctures quite fine and close but deep and quite distinct on head, densely crowded between lateral ocelli and top of each eye, but with a conspicuous, impunctate elevation just below this, adjacent to eye margin; pleural punctures very coarse, deep and well separated or sparse below, becoming quite close above, those on scutum quite regularly distributed, coarse and close, becoming somewhat coarser posteriorly, those on scutellum very coarse but rather shallow, as those on axillae; punctures of abdominal terga rather fine but very close, deep and distinct, becoming somewhat finer on impressed, apical areas, tegulae with very fine, close punctures along inner side, these disappearing toward outer margin; pseudopygidium very short but quite broad across apical margin of tergum 5.
MALE—Resembles female in all respects other than the sexual differences. The pygidium is rather broadly sub-truncate, quite coarsely and closely punctate, the margin cannate.
DISTRIBUTION — Northern Mexico, Colorado and Minnesota, to the New England states and Florida; February to April in Florida, June to September in the North.
FLOWER RECORDS — Asclepias, Cirsium, Coreopsis, Erigeron, Helianthus, Melilotus, Nepeta, Rudbeckia and Vernonia. Robertson (1929) records bifasciatus also on Aster, Bidens, Boltonia, Dianthera, Eryngium, Eupatorium, Heliopsis, Lepachys, Lythrum, Petalostemum, Pycnanthemum, Solidago, Trifolium, Verbena and Verbesina.
HOST—Probably Colletes latitarsis.