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 autumnalis is an eastern species that can
readily be identified by the following combination of features:
mesopleuron closely and evenly punctate; axilla and
mesoscutellum all black; and axilla large, but not conspicuously
diverging from side of mesoscutellum, and tip extending well
beyond midlength of mesoscutellum but not attaining apex.
Specimens of E. autumnalls may attain a relatively large size
(>10 mm). In this respect, in its overall dark colouration, and in
general appearance, the species resembles E. lectoides.
However, the integument of E. lectoides is much shinier, due in
part to larger interspaces, and both species exhibit numerous
other structural differences. Epeolus autumnalis is much more
akin to a dark E. scutellaris, but in E. scutellaris the axilla is
larger, ferwginous to some degree, and attains or surpasses
the line of pale tomentum demarcating the posterior margin of
Distribution in Canada: Atlantic and Central Canada (Map 3).
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.; black, legs testaceous to yellowish in large part, tegulae testaceous, tubercles and mandibles more ferruginous, spurs yellow; lateral ocelli separated from margin of vertex by a space about equal to their diameter; cheeks very narrow, subcarinate posteriorly, becoming still narrower below; labrum nearly as broad as the median length, deeply grooved at apex between a pair of carinae, ending in pronounced tubercles; inner margin of mandible with a distinct, median angle; posterior margin of scutellum broadly and vaguely impressed medially, axillae robust, united with lateral margins of scutellum for nearly their entire length, lateral margins carinate and slightly thickened, tips not exceeding posterior margin of scutellum (fig. 110); wings with the usual three submarginal cells, lightly infuscated, veins brownish-testaceous; face with very fine, pale tomentum below, becoming somewhat more elongate and erect above, quite dense between antennal fossae and margin of eyes; pronotum densely yellow tomentose and tubercles with a marginal fringe of yellow tomentum; scutum with a pair of narrow, longitudinal lines of yellow tomentum anteriorly; metanotum and adjacent border of scutellum densely yellow tomentose, and lateral areas of propodeum above densely tomentose; abdominal tergum 1 densely yellow tomentose basally, this continuous laterally with a transverse, subapical, yellow tomentose fascia which is slightly interrupted medially and slightly removed from margin toward the mid-line, the resulting black patch broad, transverse, slightly narrowed at each extreme side; terga 2-4 with transverse, yellow fasciae which are entire, slightly narrowed medially on 2, and slightly removed from apical rims on 2 and 3,tergum 5 with a patch of yellow tomentum on each side of pseudopygidium; punctures close, deep and rather coarse on upper part of face, vertex and cheeks, becoming very fine and quite densely crowded on clypeus and lower portions of face below antennae; tegulae closely, deeply and rather finely punctate throughout; scutum, scutellum and axillae rather coarsely rugose, pleura more finely rugoso-punctate above, lower half with definite shining interspaces between the more distinctly separated punctures; discs of abdominal terga quite deeply, finely and closely punctate, the punctures quite uniform, to considerable degree obscured by dark, appressed tomentum, finer and more densely crowded on tergum 5; pseudopygidium rather extensive, median length about half the apical width.
MALE—Answers quite fully to description of female, but front of face more densely pale tomentose, upper part of pleura quite densely covered with cream-colored tomentum, venter densely covered with silvery tomentum, the femora and hind tibiae darker; pygidium slightly broader at base than the median length, broadly rounded apically, margin cannate, surface rather closely and shallowly pitted.
DISTRIBUTION—Minnesota to Maine, south to North Carolina; September and October.
FLOWER RECORDS—Aster and Haplopappus. Robertson (1929) records this species on Bidens, Helianthus, Rudbeckia and Solidago.