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Andrena - Andrena dunningi - female

Andrena - Andrena dunningi - Female
Akron - suburban yard, Summit County, Ohio, USA
April 13, 2014
Size: 14mm length
20-50 bees were cruising around an area of open soil. Females were often landing and investigating crevices. Couldn't tell if they were emerging or aiming to dig. Many males as well (see next image), and often tackled females, though it didn't seem that they were ever successful in mating (no photos revealed even correct orientation, let alone visible genitalia). The discoverlife key (using pinned specimens from this area) led me to somewhere near A. dunningi or carlini, but i am fairly new to the species key.

Moved from ID Request.

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