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Extracted from: Brumley R.L., (1965). A Revision of the Bee Genus Epeolus Latreille of Western America North of Mexico. All Graduate Theses and Dissertations. 2682
Female (Holotype). Length 6 mm; forewing length 6 mm; labrum reddish orange, apical� teeth red ; clypeus, scape mahogany; pedicel, flagellomeres reddish orange with apical borders lighter; thorax entirely mahogany; tegulae light reddish orange; legs coppery, except apices of femora, tibiae, tarsi light reddish orange; metasomal tergites reddish mahogany, apices clear, except V reddish orange; pygidium reddish with darkened margins; clypeus with appressed, whitish pubescence, more erect above antennal fossae; vertex with few erect, whitish hairs; pronotum, metanotum, scutal margins except antero-medially, posterior, lateral faces
of scutellum with appressed, off-whitish pubescence; scutum with short, coppery hairs , except white on two-antero-median, longitudinal lines, few scattered hairs between; upper one half mesopleuron with appressed, off-white pubescence anteriorly, more sparse, erect posteriorly, lower one half nude; metasomal tergite I with off-white pubescence, except dark antero-laterally, posteromedially, short, transverse band on disc; tergite II with broad, off-white pubescence on apical band, slightly broadened laterally, interrupted medially; tergite III with a continuous fascia, somewhat sinuate sublaterally; tergite IV similar to III, except strongly constricted; sternite V with a short, golden, apical fimbria; clypeus with shallow, dense, irregular punctures; vertex with larger, more widely spaced punctures around ocelli, on posterior margin of head ; finely , densely punctate between ocelli and compound eye; lower one half of mesopleuron with punctures often separated by slightly more than one puncture diameter, denser above; scutum, scutellum with punctures slightly denser than mesopleuron, separated by less than a puncture diameter; propodeal enclosure moderately rugose dorsally, finely rugose medially, nearly impunctate laterally; forewings with three submarginal cells, faintly pubescent apically, extremely clear basally, veins ferruginous; antennae short, flagellomere II nearly as broad as long; vertex slightly concave laterad of lateral ocelli; axillae short, tips extending less than one half distance to posterior mar gin of scutellum, blunt; scutellum with but a weak median emargination.
Extracted from: Onuferko TM (2018). A revision of the cleptoparasitic bee genus Epeolus Latreille for Nearctic species, north of Mexico (Hymenoptera, Apidae). ZooKeys 755: 1–185. https://doi.org/10.3897/zookeys.755.23939
Diagnosis. The following morphological features in combination (excluding any that
are specific to the opposite sex of the one being diagnosed) can be used to tell E.
barberiellus apart from all other North American Epeolus except E. americanus and E.
asperatus: in females, F2 is not more than 1.1 × as long as wide; the mesoscutum has
distinct paramedian bands; the axilla is small to intermediate in size, not extending
beyond the midlength of the mesoscutellum and the free portion is less than 1/4 as
long as the entire medial length of the axilla, and like the mesoscutellum black; the
mesopleuron is closely (i≤1d) and evenly punctate; T1 has a quadrangular discal patch,
in dorsal view the longitudinal band is at least as wide as the breadth of the apical
fascia; and the T1 and T2 apical fasciae are interrupted or at least greatly narrowed
medially. In E. asperatus the mesopleuron has much denser punctures ventrolaterally
(most i<1d) than that of E. barberiellus and the T3 and T4 fasciae are never complete
but broken or at least greatly narrowed laterally, as well as medially into separated or
narrowly connected oval patches. Epeolus barberiellus is most similar to E. americanus,
but in E. americanus the pronotal lobe and legs are brown or black, not reddish orange.
Redescription. FEMALE: Length 5.7 mm; head length 1.8 mm; head width 2.3
mm; fore wing length 5.0 mm.
Integument coloration. Mostly black; notable exceptions as follows: at least partially
ferruginous on mandible, labrum, antenna, pronotal lobe, tegula, mesopleuron, metapleuron, propodeum, legs, metasomal terga (including pygidial plate), and metasomal
sterna. Mandible with apex darker than rest of mandible; preapical tooth as dark as
mandibular apex (difficult to see in holotype because mandible closed; described from
non-type specimens). Pedicel and flagellum brown and orange in part, slightly lighter
than dark brown scape. Pronotal lobe reddish brown. Tegula pale ferruginous to amber. Wing membrane subhyaline, apically dusky. Legs more extensively reddish orange
than brown or black. T5 and pygidial plate reddish orange.
Pubescence. Face with tomentum densest around antennal socket. Dorsum of
mesosoma and metasoma with bands of off-white to pale yellow short appressed setae. Mesoscutum with paramedian band and moderately dense pale tomentum along
margins. Mesopleuron densely hairy, except for almost entirely bare circular patch occupying much of ventrolateral half of mesopleuron. Metanotum with tomentum uninterrupted, uniformly off white. T1 with median quadrangular reddish-brown discal
patch enclosed by pale tomentum, except for medial separation at apex, and narrow, such that longitudinal band more than half as wide as width of discal patch in dorsal view. T2 with fascia interrupted medially and without anterolateral extensions of
tomentum, although fascia broader laterally with hairs sparser basally. T3 and T4 with
fasciae complete and narrowed laterally. T5 with two patches of pale tomentum lateral
to and separate from pseudopygidial area. T5 with pseudopygidial area lunate, its apex
more than twice as wide as medial length, indicated by silvery setae on impressed disc
of apicomedial region elevated from rest of tergum. S5 with apical fimbria of coppery
to silvery hairs not extending beyond apex of sternum by more than 1/4 MOD.
Surface sculpture. Punctures dense. Labrum with larger and sparser punctures (i=1–
2d) than clypeus (i<1d). Impunctate spot lateral to lateral ocellus absent in holotype,
but shiny spot present in non-type specimens. Mesoscutum, mesoscutellum, and axilla
coarsely and densely rugose-punctate. Tegula densely punctate mesally (i≤1d), less so
laterally (i=1–2d). Mesopleuron with ventrolateral half densely punctate (i≤1d), the interspaces shining; mesopleuron with punctures more or less equally dense throughout.
Metasomal terga with punctures very fine, dense (i≈1d), evenly distributed on disc.
Structure. Labrum with pair of small subapical denticles not preceded by carinae.
Frontal keel not strongly raised. Scape with greatest length 1.9 × greatest width. F2
as long as wide (L/W ratio = 1.0). Preoccipital ridge not joining hypostomal carina,
from which it is separated by about 1.5–2 MOD at its terminal (difficult to see in
holotype; described from non-type specimens). Mesoscutellum moderately bigibbous.
Axilla small to intermediate in size, its lateral margin (L) less than half as long as mesoscutellar width (W) (L/W ratio = 0.3) and tip not extending beyond midlength of
mesoscutellum; axilla with tip visible, but unattached to mesoscutellum for less than
1/4 the medial length of axilla; axilla with lateral margin relatively straight and without
carina. Fore wing with three submarginal cells. Pygidial plate apically truncate.
MALE: Description as for female except for usual secondary sexual characters and
as follows: F2 shorter, nearly as long as wide (L/W ratio = 0.8); S4 and S5 with much
longer coppery to silvery subapical hairs, which individually are often darker apically;
pygidial plate orange and V-shaped but apically rounded, with large deep punctures
closely clustered.
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