Caryomyia tuberculata Gagne, new species

Hosts: Carya texana, ovata, glabra, tomentosa

Gall (Figs. 118-119): Common, on Eucarya hickories; often in groups, on lower leaf surface between veins; 3.5-5.1 mm in height, depressed-spherical to spheroidal, occasionally with slightly pointed apex; surface hairless, bumpy, sticky, green, yellow, or brown to almost purple; base with large, central, deep, circular excavation, leaf without exfoliation surrounding connection; wall uniformly thick, woody, larval chamber ovoid, floccose, white, green, to purplish. The gall is most like that of C. purpurea because of its shape, the thick, woody wall, and the leaf connection but, unlike that of C. purpurea, is bumpy and hairless.

Affinities. — The closest relative among species with long male flagellomeres and an apically convex aedeagus is not apparent. Unlike other such species, such as C. purpurea and C. holotricha with spheroidal galls that occur on the leaf lamina and have a deep, circular, basal recess.

Biological notes. — Tiny, yellow-green, soft galls containing first instars were first noticed in central Maryland on June 10. On June 22 new and full grown galls were found on the same leaf, with first and second instars, respectively. Galls found from late June through mid-August contained second instars, after which third instars were regularly found. The full-grown larva fills the larval chamber. Adults emerge through a hole in the side of the gall.

Range: AL, AR, CT, GA, IN, KY, LA, MD, MA, MS, MO, NH, NC, OK, PA, SC, TN, VA, DC, WV

Cecidomyia sp. [Tentatively assigned to C tuberculata based on Felt's description]

Carya sp.
Globose leaf galls, smooth or nearly so
Thick-walled, irregularly ovate, granulate, a slight nipple, diameter 2 to 3 mm.