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Photo#1244375
Hesperapis rufipes - female

Hesperapis rufipes - Female
Santa Fe Flood Control Basin, Irwindale, Los Angeles County, California, USA
May 11, 2016
Size: 6 mm
Found on Navarretia hamata.
Used Michener's description (1936), this morning compared with identified specimens in the collection put together at the L.A. Nat. Hist. Museum by Roy Snelling.
Have male specimens as well, but no photos. All specimens have been deposited in the Biological Collections at Cal. State U. Northridge.

Images of this individual: tag all
Hesperapis rufipes - female Hesperapis rufipes - female

There are undescribed species in this group
However, the type locality of H. rufipes is Los Angeles Co., so you should have the described form which is supposed to be oligolectic on Hugelia

 
Thanks, John,
for looking at this! The plant genus Hugelia, formerly a subgenus of Gilia, is now in genus Eriastrum. Both Eriastrum and Navarretia occur at Santa Fe Flood Control Basin. At least in 2016 Navarretia bloomed in early May, before Eriastrum. Will be interesting to check more carefully next year!
At Tanbark Flat (San Dimas Experimental Station, L.A. County), nests were "found in heavy, hard-packed soil in clearing among pine trees...Navarretia hamata, the pollen source of the bees at this site, was common throughout the clearing." (Gerald I. Stage, unpublished notes made available by Jerome Rozen; NOVITATES 3856).
Oh, a question: Do you know where the English name "Hugelia Evening Bees" comes from?

Moved
Moved from Subgenus Zacesta.

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