A number of these (both male and female) were intently nectaring on the flowers of "Quenn Anne's Lace" (Daucus carota
), a weedy non-native member the carrot family, Apiaceae. The thumbnails below show posts of two other individuals from the same time and locale:
I recognized them as Gasteruption
from gestalt, but the main characters are: long slender abdomen attached high on the mesosoma, well above the hind legs; long "neck"; and distally swollen hind tibiae. While adults of this genus feed on nectar (and perhaps pollen
) from a variety of families of flowering plants, they are known to be especially fond of Apiaceae.
Using Townes (1950), the short ovipositor (i.e. half or less the length of the fore wings) narrows the candidate species down to G. assectator
, G. kirbii
, or G. amputatum
. The last of those three can be eliminated, since it has a white tip on the ovipositor and its range is southern Arizona into Mexico.
Finally, measuring the length-to-width ratio of the 2nd tarsus of the hind leg and the 4th antennal segment, together with the dull sheen of the head, led me to G. assectator
. Details of the characters separating G. assectator
and G. kirbii
can be found here