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Extracted from: Swenk, M. H. 1915. The University Studies of the University of Nebraska, Vol. 15.
Female. Length 5.5–7.5 mm. Dark red; mandible tips, subcordate area between
and above insertion of antennae and sometimes extending down into clypeal
sutures, oval spot involving ocelli, cheeks except orbital line, most of pro
pleura, broad median mesoscutal line, depressed sides of mesoscutellum and
metanotum, median band on propodeum, metapleura and contiguous parts
of propodeum and basal half of first abdominal tergite, black. Pubescence
very sparse, white, most obvious on angles of propodeum. Antennae red,
joint 3 three-fifths as long as 4. Tubercles coppery red. Mesoscutellum
prominently bigibbose. Tegulae testaceous. Wings hyaline, the marginal
cell and wing tip in fuscated, nervures and stigma blackish, the basal nerv
ure well basad of transverso-medial, third submarginal much narrowed
above. Legs dark red, the coxae, trochanters and femora behind and at
base extensively blackened, the hind basitarsi wholly blackish. Outer face
of hind tibiae finely tuberculate, the apex of hind tibiae with two fine, dark
setae. Abdomen minutely and feebly punctured, dark red, the apical mar
gins of the tergites becoming obscured, large, oval, clear pale yellow spots
on sides of tergites 2 and 3, tergite 5 with a narrow apical band of short
dense white hair.
Male. Length 5.5–6.5 mm. Head and thorax black; mandibles except tips,
labrum, lower half or more of clypeus, sometimes the supraclypeus, and
lower corners of face varying from yellow to reddish testaceous, the
tubercles, tegulae and legs, except coxae, trochanters and basal half of fem
ora, reddish testaceous. Orbital areas on sides of vertex, sometimes extend
ing down orbital margins, especially anteriorly, sometimes spots on collar,
mesoscutellum, large areas on sides of mesoscutum, a variably sized spot
on mesopleura and sometimes small spots on sides of propodeum, fer
ruginous. Antennae reddish testaceous below, above black for basal seven
joints, last six joints in fuscated above, joint 3 one-half as long as 4 or
slightly more. Pubescence wholly white, appressed and silky on face,
rather copious and erect on cheeks, pleura, angles of propodeum and
thoracic dorsum. Mesoscutellum slightly bilobed. Wings as in the 2, but
nervures testaceous and basal nervure varying from much to slightly or not
at all basad of transverso-medial. Abdomen with first tergite black on
basal half at least, apically reddish testaceous, following tergites reddish
testaceous, the apical margins of tergites 2–4 becoming broadly obfuscated,
tergite 2 with oval, pale yellow spots laterally, tergite 3 usually with similar
smaller spots. Apex sharply notched.
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