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Photo#200095
Spilomyia interrupta ? - Spilomyia foxleei

Spilomyia interrupta ? - Spilomyia foxleei
Aromas, San Benito County, California, USA
July 10, 2008
Size: ~14mm
First one of these I've seen on our property, thought it was a yellow jacket at first. After perusing the Syrphids on BugGuide, I think it is Spilomyia interrupta . It was on Heteromeles arbutifolia, but didn't seem interested in the flowers, it was always on a leaf. Saw it or another individual about half an hour later on another Heteromeles arbutifolia bush, but it wouldn't land where I could photograph it. (live oak/chaparral habitat).

Images of this individual: tag all
Spilomyia interrupta ? - Spilomyia foxleei Spilomyia interrupta ? - Spilomyia foxleei Spilomyia interrupta ? - Spilomyia foxleei Spilomyia interrupta ? - Spilomyia foxleei

Moved
Moved from Spilomyia.

The differences between
S. interrupta and foxleei are not evident from these photos. The photo you refer to above was identified from specimen.
The facial shot looks like it could be foxleei, but one would have to see a lateral view.
Note the ventrally produced tubercle on this female S. interrupta from Mt. Pinos (also identified from specimen):

The two species are extremely similar, and easily confused.

 
Can you elaborate?
I can't see any tubercles in that photo. Is it on the head, thorax, abdomen, or one of the legs?

 
The short answer,
its in the face. Either not produced ventrally, with ventral margin of head horizontal = S. foxleei
.
Or face with a weak, but distinct tubercle, produced ventrally so the ventral margin of the head appears angular. Depending on some other characters, this can lead to either S. interrupta
,
or to S. citima
I suggest to also study the key and descriptions in Vockeroth (1996). Full PDF available, see INFO page, where you can also find links to specimen photos from the Flower Fly Survey of L.A. County.

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