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ID for a wasp on Horkelia? - Gasteruption kaweahense - male

ID for a wasp on Horkelia? - Gasteruption kaweahense - Male
Claremont, Los Angeles County, California, USA
April 27, 2011
Size: 10 - 15 mm?
This small wasp was spotted on Wedge-Leaf Honeydew, Horkelia cuneata ssp. puberula, at the Claremont Colleges' Robert J. Bernard Biological Field Station, by a University of California, Riverside, graduate student who is helping to develop a conservation plan for this plant species.

H. cuneata ssp. puberula is seriously endangered and in decline in California, but the factors contributing to its decline and are not known. Nothing is known about the pollination biology of this species, so identifying key pollinators could be important in developing an effective conservation plan. There appeared to be quite a few of this species of wasp on the Horkelia (e.g., see here), so we will be most appreciative of any information about its identity!

I did not have my macro lens with me, so I will try to get better photos this weekend. Any tips on what parts are most useful for identification will be appreciated.

Images of this individual: tag all
ID for a wasp on Horkelia? - Gasteruption kaweahense - male ID for a wasp on Horkelia? - Gasteruption kaweahense

Moved from Gasteruption.

Gasteruption kaweahense (Bradley), male. Specimens examined.

Ok for a male Gasteruption sp. There are a number of species in CA, and I can't identify them from photos, especially males. If you want to send me some specimens, I'll gladly put a name on them and let you know what is known about them. There is no substitute for actually seeing the specimens.


Looks like Gasteruption with an especially long neck, but that genus prefers carrots to simple flowers like this.

Agree with Gasteruption (male)
There are some in the Guide having especially long necks and hanging out on simple flowers:

Thanks for the very speedy ID! The one in the thumbnail in your comment was photographed not far from here.

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