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Osmia? - Osmia montana

Osmia? - Osmia montana
Mill Creek Summit area, ~4970 ft. altitude, San Gabriel Mountains, Los Angeles County, California, USA
April 6, 2007
Size: ~10 mm
In Rhus trilobata (Skunkbrush). I find the large, square head rather striking.

Images of this individual: tag all
Osmia? - Osmia montana Osmia? - Osmia montana Osmia? - Osmia montana

Moved from Osmia montana.

this is a Cephalosmia, named for its striking head
Cephalosmia is a subgenus of Osmia.

This is Osmia (Cephalosmia) montana quadriceps Cresson, 1878, a common species in California.

The smooth, shining, and concave lower face (including clypeus) and nearly black (not green or blue) integument is typical of O. montana.

Thanks, John,
for the ID! I've seen this bee before, possibly Mt. Pinos area, might even have some other photos buried in my files.

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