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Photo#500129
Chalcid parasitoid of Disholcaspis quercusglobulus - Ormyrus - female

Chalcid parasitoid of Disholcaspis quercusglobulus - Ormyrus - Female
Quabbin Reservation, New Salem, Franklin County, Massachusetts, USA
Size: 3 mm
Emerged today (3/22/2011) from a stunted (5 mm), red, wrinkled Disholcaspis quercusglobulus gall on white oak, which I collected on 2/15/2011. More photos and info here.

Moved
A chalcidologist friend informed me that his is the genus Ormyrus, but he is unable to place it to species. In the 1979 catalog of Hymenoptera in America north of Mexico, two species of Ormyrus are recorded as parasitoids of species of Disholcaspis on oak, but not from quercusglobulus. Given that some species parasitize more than one genus of gallmakers, I would suppose that they might never be host specific to a single species of Disholcaspis.

Moved from "Parasitica" (parasitic Apocrita).

 
Interesting...
It seems it is probably not either of those two species: O. distinctus parasitizes D. simulata, a California species; O. labotus is known from Florida, where it parasitizes D. quercusvirens, which makes galls only on Quercus virginiana. I see now that I had already reared one of these from the same type of gall, six years and two cameras ago:

I'll save the specimen to send to the SEL. I just sent my first batch of specimens there this month, and was told the wait would be about a year...

Ormyrid - femaleā€¦
Thought this might be a male torymid, but it is not. The features are very similar in both of these groups. Nice work, Charlie.

See reference here.

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