Collected at Gypsum, Ohio, August, on H. microcarpa.
Type specimens at Ohio State University.
11. Cecidomyia sp. Cecidium nov.
On leaf, under side, rather large conic gall, whose distal ½-⅓ constitutes a very slender apical process. Through this passes the fine canal leading to the depressed, sub-globular chamber in the proximal part of the gall. The galls are either erect or more generally tilted to one side, always arising from one of the larger veins. 5-8 mm. long, 2½-3½ mm. wide at base. Outline of the flaring sessile base generally angular. Attenuate distal portion turning dark early. Light greenish yellow to brown when old. Smooth. Walls of chamber thick. A slender probable variety of this is figured in 11a, pl. I.
Collected in Hocking County, Ohio, on H. alba. July.
Type specimens at Ohio State University.
12. Caryomyia caryæcola O. S.
On leaf, under side, large galls with globular basal part extending into a point distally. Shape suggests that of a Prince Rupert’s drop. 4-7 mm. long. Surface very smooth, greenish to reddish tinged. Some show a definite blue color over the attenuate apical end. Walls of medium thickness, very firm. Somewhat similar to C. sanguinolenta O. S. but differs from that gall in its larger size and much more attenuate distal end. Common on different hickories.
- Osten Sacken, Lowe’s Mongr. Dip N. Am. Pt. 1, p. 192. 1862.
- Felt, Jour. Econ. Ent. 4:456. 1911.
13. Caryomyia sanguinolenta O. S.