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Common Oblique Syrphid - Allograpta obliqua - male

Common Oblique Syrphid - Allograpta obliqua - Male
32.13, -97.85, Somervell County, Texas, USA
November 20, 2011
Yellow halteres are visible on each side of body near front of abdomen.

Moved from obliqua or exotica.

Markings on tergite 2 are consistent with obliqua; see:


No argument but a question:
What is it that makes this one ambiguous? I have some other angles of the same individual that I can check, if I knew what I need to show.

It turns out, unfortunately,
It turns out, unfortunately, that the oblique spots on the end of the abdomen are present on both obliqua and exotica. To tell between the two, we're looking for the following two traits, shown here:

First, a yellow katepisternum (obliqua), visible in some side images of the fly. Black here is exotica. Second, a pale facial stripe is obliqua; dark to black is exotica.

Hope that helps!

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