Dec, 1915] Zoocecidia on Species of Hicoria 47 



enchmya layer. This gall is very distinctive no other forms 

 having the peculiar angular structure which it possesses. Not 

 abundant. 



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 Y2~k 

 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, 23/^-33^ 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, pi. I. 



Collected in Hocking County, Ohio, on H. alba. July. 



Type specimens at Ohio State University. 



12. Caryomyia caryaecola 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. sangiiinolenta 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. 



On leaf, beneath, stoutly conical, varying in size from 13^2 

 mm. to 4 mm. high. Tip erect or often bent to one side. 

 Smooth, green to purplish-red and finally a brown when old. 

 Attached to smaller veins by short pedicel, hidden from view, 

 however, by the rounded base of the gall. Walls medium in 

 thickness, possessing the rather soft texture of charcoal when 

 dry; brown in color. 



This form is often found in enormous numbers on certain 

 trees, bringing about early disintegration of the affected leaves. 



