Collected on H. microcarpa in Ohio and H. glabra in Connecticut.
This gall is very close if not identical with Caryomyia similis Felt. It differs from his description in that it is not “depressed.”
- Felt, Jour. Econ. Ent. 4:456. 1911.
- Felt, Bull. Brooklyn Ent. Soc. 8:99. 1913.
25. Cecidomyia sp.
On leaf, generally on upper side, balloon-shaped gall, 3-5 mm. high, 3-4 mm. wide. Terminal nipple arising from slight apical depression. Greenish-brown or sometimes varying toward a very dark purplish tinge, its peculiar color being very constant and characteristic. The surface is dotted over with short, swollen glandular hairs. Trichomes sometimes projecting slightly from apical pore. Walls very thin. Galls attached to short, stout process of the leaf, to be seen only in median, vertical section. Surface of leaf on side opposite the gall not raised. Never numerous on leaflet. Closely related, if not identical, with C. caryae O. S. See No. 20.
Observed on H. glabra, in Hocking County, Ohio, July.
26. Caryomyia tubicola O. S.
On leaf, under side, cylindrical with rounded distal end standing erect from the cup-like base embedded in the leaf blade. 4-6 mm. high, generally very close to 5 mm. 1 mm. dia. Body of gall, yellow to brown in color, distal end reddish to brown, at length almost black. Basal cup, greenish yellow to dark purple. Cylindrical part of gall smooth as though polished. Gall attached to the cup only at its central basal part. Before the end of summer the tube-like portion breaks away with its enclosed larva. On the side of the leaf opposite the gall its position is indicated merely by a dark discoloration. Very common on different kinds of hickories.
- Osten Sacken, Lowe’s Monogr. Dip N. Am. Pt. 1, p. 192, 1862.
- Felt, Rept. Ins. N. Y. 1907. pp. 382, 388, pl. 37, Fig. 5.
- Felt, “Caryomyia tubicola” Jour. Econ. Ent. 4:456. 1911.
27. Cecidomyia sp. Cecidium nov.