Dec, 1915] Zoocecidia on Species of Ilicoria 53 



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 pro- 

 jecting 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 //. 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 pol- 

 ished. 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, Kept. Ins. N. Y. 1907. pp. 382, 388, pi. 37, Fig. 5. 

 Felt, "Caryomyia tubicola" Jour. Econ. Ent. 4:456. 1911. 



27. Cecidomyia sp. Cecidium nov. 



Leaf, under side, arising from a shallow cup-like structure. 

 Shape of a slender horn, slightly curved, 5-7 mm. long, 13<4 mm. 

 wide at base. Light green at base, changing to yellow, the 

 distal f of the gall a deep brown. No demonstrable opening at 

 the end. Walls thin. Surface smooth, under lens minute 

 longitudinal striations evident. Very little discoloration on the 



