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Photo#875764
Female Macrosiagon 1 - Macrosiagon flavipennis - female

Female Macrosiagon 1 - Macrosiagon flavipennis - Female
Rialto, San Bernardino County, California, USA
July 20, 2013
Size: BL: Approx. 12mm
This ripiphorid was found here visiting flowers of California buckwheat (Eriogonum fasciculatum). It belongs to the genus Macrosiagon...among other things, from the long, apically-tapering elytra. The monopectinate antennae indicate this is a female.

According to the treatments in Rivnay(1), Vaurie(2), and Linsley & MacSwain(3), this is either M. flavipenne or M. fernaldum, from the conspicuous semi-erect, excavated, "spine"-like process at the postero-medial tip of the pronotum...which is distinctive of those two species alone in Macrosiagon. The latter is only known from southern California...which is unusual in this genus, where species typically have a very large range, often spanning the entire U.S. and beyond. It would be great to get images of M. fernaldum, but apparently the individual here is the more widespread and common M. flavipenne (=flavipennis). According to Rivnay (see pg. 27):

"The female M. fernaldum has the processes of the antennae bifurcate, the elytra yellow with a brownish tinge at apex, the wings hyaline; while in flavipenne the antennal processes are acute or truncate, elytra yellow with posterior half black and the wings are brown."

The female here agrees with the 3 character states given for M. flavipenne above. Moreover, agreement with details of the rest of the key characters, descriptions, and discussions of M. flavipenne in Rivnay(1), Vaurie(2), and Linsley & MacSwain(3) make it clear this is M. flavipenne. Rivnay's description can be read at this link.

In particular, note that females of M. flavipenne have abdomen red and head black (although color is often variable in the genus). Also, the hind tarsi have 2nd and 3rd segments subequal, and the head has vertex much-elevated, coarsely punctate, and (slightly) concave (laterally) on the front. These characters can be seen in the full-size versions of a number of images in this series.

The "excavated (from beneath)" character of the pronotal process can be seen well in the full-size version of the image above.

Images of this individual: tag all
Female Macrosiagon 1 - Macrosiagon flavipennis - female Female Macrosiagon 1 - Macrosiagon flavipennis - female Female Macrosiagon 1 - Macrosiagon flavipennis - female Female Macrosiagon 1 - Macrosiagon flavipennis - female Female Macrosiagon 1 - Macrosiagon flavipennis - female Female Macrosiagon 1 - Macrosiagon flavipennis - female Female Macrosiagon 1 - Macrosiagon flavipennis - female