Reprinted with permission from: Mitchell, T.B. 1960 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.
This species is more western in distribution, occurring in Colorado, Nebraska, South Dakota and Manitoba, but has also been recorded in Wisconsin. It is nearly identical with aestivalis, differing only in size, the relative proportions of the hind basitarsi, and the male genital armature and 7th abdominal sternum.
FEMALE—Length 12-14 mm.; length of hind basitarsi about three and a third times the breadth.
MALE—Length 14 mom.; length of hind basitarsi no more than three times the breadth; wings of sternum 7 with an inner apical angle.
This visits Heuchera and is in flight from mid May to mid July.
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