Thick-walled, particularly the distal end, covered with heavy tawny pubescence. (21). 20. Thinner walled, pubescence very short, puberulent. 21. 20. Very smooth. (22). 21. Depressed (not over 3 mm. high) with column extending through center of chamber. (23). 21. Globular, 4-5 mm. high. (24). 21. Definitely balloon-shape. (25). 22. Base embedded in socket. 23. 22. Base not embedded in socket. 24. 23. Round-conic at tip. Caryomyia tubicola. (26). 23. Tapering to point, horn-like. (27). 24. Small gall, 2-2½ mm. high, with flaring base, attached by minute pedicel at center. (28). 24. Large gall, 5-6 mm. long, gradually constricted proximally to very narrow neck at point of attachment. (29). 25. Distal face with fovea containing a central nipple. Leaf not projecting on side opposite gall. (30). 25. Distal face with fovea, leading into central pore; no central nipple. Prominent convexity of leaf on side opposite the gall. (31). 25. Distal face flaring out at edge into radiate bracts; these sometimes strongly incurved. (32). ERIOPHYIDÆ. 1. =Eriophyes?= sp. =Cecidium= nov. Small galls in the axils of the lateral veins of the leaflets. Above marked by a light colored angular area 1-1½ mm. dia. Below a small mass of tissue (the gall proper) fills the angle, covered by a fine close pubescence. Chamber within of small diameter, irregular in shape. The characteristic mites were definitely observed. They are white in color. On some leaflets every angle made by the mid-vein branching into the lateral ones was occupied by a gall. On _H. cordiformis_, in Athens County, Ohio, August. Type specimens at Ohio State University. 2. =Eriophyes?= sp. Leaf edge gall; edge inrolled involving little more than the teeth. Variable in length from .5-2 cm. or longer, 1 mm.-2 mm. thick. Outer surface of affected area finely roughened; color of under side of the leaf. Thompson states that mites live within the fold. His report is the first one on this gall. Species of hickory on which specimens were found not determined. Thompson, Illus. Cat. Am. Ins. Galls. 1915. p. 57, pl. 10, Fig. 260. ITONIDIDÆ. 3. =Caryomyia nucicola=, O. S. “Irregular swelling in the husk produced by the reddish larvæ. Reference to Caryomyia provisional.” Felt. “Contain thick walled cells. On Carya (Hicoria) alba.” Jarvis. Osten Sacken, Trans. Am. Ent. Soc. 3:53. 1870. Felt, Jour. Econ. Ent. 4:457. 1911. Jarvis, 39th Ann. Rept. Ent. Soc. Ont. 1908. p. 84. 4. =Cecidomyia cynipsea= O. S. “Rounded, irregular, hard swelling on the under side of the hickory leaf, on the mid-rib near the base of the leaf about half an inch long. In July, pale yellowish and contained in several small hollows, minute whitish larvæ, with breast bone narrowed anteriorly and ending in a point.” Osten Sacken.