Reprinted with permission from: Mitchell, T.B. 1960 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.
FEMALE—Length 9-10 mm.; eyes convergent below; malar space short, length about one-fifth its breadth; facial foveae much reduced, both narrow and short; antennae dull reddish-piceous, median segments about as broad as long; clypeus produced about one- third below suborbital line, punctures deep and distinct, rather fine, close above, more sparse and irregular below; supraclypeal area with rather coarse and deep, well separated punctures; face above antennae dull, with close, fine, deep and distinct punctures; vertex between eyes and ocelli shining, punctures fine, close and irregular; punctures of cheeks very fine and close; pubescence of head and thorax ochraceous above, becoming whitish below, without dark admixture; lateral angles of pronotum slightly produced to form short acute spines; metapleural protuberance not carinate; legs dark, spurs yellowish; tegulae piceous, shining, wings hyaline, violaceous apically, veins and stigma ferruginous to piceous; scutum anteriorly closely, deeply and quite coarsely punctate, punctures becoming somewhat coarser and well separated posteriorly, sparse in center; punctures of scutellum coarser, rather close, but anterior margin narrowly impunctate; pleura rather dull, rugoso-punctate anteriorly and above, punctures close, deeper and more distinct below; lateral faces of propodeum somewhat shining, obscurely reticulate above, dorsal face narrow, with short close parallel striae, posterior face reticulate; anterior coxal spines very short and blunt; hind basitarsi about four times longer than broad; basal abdominal tergum shining, distinctly but minutely and quite sparsely punctate, punctures becoming much closer and more minute on the more apical segments; apical margins of terga slightly depressed, narrowly testaceous beneath the entire, narrow, dense, white fasciae, discal pubescence short, thin, erect, largely pale.
MALE—Length 8 mm.; eyes slightly convergent below; malar space nearly as long as it is broad; antennae brownish-fuscous beneath, length of median segments about one and a half times the breadth; clypeus above very finely and closely punctate beneath the dense white pubescence, punctures becoming more sparse and coarse over the shining apical portion; lateral angles of pronotum acute but not spine-like; metapleural protuberance low, not carinate; tarsi dark, spurs yellowish; tegulae ferruginous; wings hyaline, slightly violaceous, veins and stigma ferruginous; scutum shining, punctures coarse and deep, close over most of disc, those on scutellum more coarse, close except along anterior border; pleura rather shining, more closely but otherwise punctured similarly to scutum; dorsal area of propodeum with close parallel striae; basitarsi slender, parallel-sided; abdominal terga shining, punctures deep and distinct, rather fine, well separated but not sparse, apical margins of segments reddish-hyaline, distinctly depressed beneath the entire, white, apical fasciae; pubescence entirely white, without dark admixture.
DISTRIBUTION—This is a boreal species and is recorded in the East only from Maine and Michigan. In Canada it ranges from Nova Scotia to Yukon, and in the United States west to South Dakota, Colorado and New Mexico. It is in flight from late June to September.
FLOWER RECORDS—Sonchus arvensis. Stephen records hyalinus on Achillea, Cirsium, Epilobium, Frasera, Kalmia, Melilotus, Rhus and Solidago.
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