Caryomyia caminata Gagne, new species

Hosts: Carya ovata, glabra

Gall (Figs. 7, 108-109): Rare, on Eucarya hickories; on lower leaf surface, between veins; 5 mm in height, columnar, widest near base, tapering to apex, a small aperture present at apex; matte, hairless, green, turning brown; base of gall truncate, leaf with slight exfoliation around connection forming short, tubular socket, a corresponding convexity present on opposite leaf surface; two-chambered, the basal larval chamber about 1/4 length of gall, ovoid, smooth, longitudinally ridged, the apical false chamber also ridged and open or closed apically, the partition between chambers with minute, central perforation. This gall is known from only two specimens, one a figure in Wells (1916).

Affinities. — The gall vaguely resembles an- other bicameral gall, that of C. ovalis, but the wall of the latter is thicker and shiny, not brittle, foliaceous, and matte as in the present species. The gall of C. tubicola is also elongate-cylindrical and set into a leaf socket, but it does not have a false chamber; also the larva of C. tubicola has only 4 dorsal abdominal papillae, while the present species has 6.

Range: IN, OH