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ID for a bee on Phacelia? - Filacus

ID for a bee on Phacelia? - Filacus
Claremont, Los Angeles County, California, USA
March 16, 2011
Size: Approx. 7-8 mm
This bee (oops, sawfly!) was seen on Phacelia distans at about 5:00 pm at the Claremont Colleges' Robert J. Bernard Biological Field Station. The Phacelia is just coming into full bloom, and several different types of bees were visiting. I didn't recognize this particular visitor, and I think this is the only photo I have of it. The size was estimated by comparison to the Phacelia flower. Any information about it will be greatly appreciated!

Moved from Tenthredininae.

Tenthredinidae, Tenthredininae
Filacus sp. There are 4 species in the West. Photos seldom show characters needed for species identification. Adults are known to visit Phacelia and other flowers. The larva of at least one feeds on Phacelia.

sawfly, not a bee; maybe a Macrophya --let's wait for Dr Smith

Thanks! I see I need to educate myself! I've never photographed a sawfly before, so I'll be looking forward to learning about them. Once you pointed it out, however, I remembered that Harmut Wisch had photographed this sawfly on Phacelia at the field station in April 2010.

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