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Two female Macrosiagon - Macrosiagon flavipennis - female

Two female Macrosiagon - Macrosiagon flavipennis - Female
Rialto, San Bernardino County, California, USA
July 20, 2013
Size: BL: Approx. 12mm
These two ripiphorids were found here on flowers of California buckwheat, Eriogonum fasciculatum. They can both be seen to be females from their unipectinate (=one-sided comb-like) antennae. Alice Abela posted images of a female from the same visit:

No males were seen...indeed, males generally seem to be much less frequently encountered in Ripiphoridae.

These keyed clearly to Macrosiagon flavipenne in Rivnay(1), Vaurie(2), and Linsley & MacSwain(3). For more details on the ID, see remarks with the posts linked to the thumbnails below (which show further images of the individuals above).

Nomenclatural Note: All three of the references cited above use endings for specific epithets in Macrosiagon different from those used on BugGuide (i.e. flavipenne vs. flavipennis; dimidiatum vs. dimidiata; cruentum vs. cruenta; etc.).

Vaurie(2) commented that:

      "Although the word siagon, from the Greek meaning jaw or jawbone, is feminine,
        most authors have evidently followed Hentz and considered the name neuter."

BugGuide currently uses flavipennis, which is the ending used in the original species description of LeConte...and the feminine forms dimidiata, octomaculata, etc. (cf. remark on info page here).