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Tachinid Fly (Tachinidae, Diptera) on Palmer's Goldenbush
Nikon D300
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Tachinid Fly (Tachinidae, Diptera) on Palmer's Goldenbush

11/11/09
This is not a great photo, but the fly is so camera shy that I probably won't get a better one. It's a bristly Tachinid Fly (Tachinidae in the order Diptera) working new composite flowers of Palmer's Goldenbush (Ericameria palmeri var. pachylepis) growing on the dry flood plain by the river. The distinctive fly has whitish "windows" on its abdomen. I've seen the same flies lately on composite flowers of Coyote Bush (Baccharis pilularis) and Bush Groundsel (Senecio douglasii) shrubs. (Paradise, Santa Ynez River, 10 November 2009)

Checking at BugGuide, this fly might be in the genus Peleteria. See http://bugguide.net/node/view/53639.

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