50 The Ohio Journal of Science [Vol. XVI, No. 2, 



This gall was described from Connecticut in citation below 

 on H. ovata. Rather common in Hocking County, Ohio, 

 on H. microcarpa. July, August. 



Felt's "Cecidomyia sp. Globose, irregular, ovate, granulate, a slight nipple, 

 dia. 2-3 mm." probably belongs here. 

 Felt, Jour. Econ. Ent. 4:456. 1911. 

 Wells, Ohio Nat. 14:291. 1914. 



19. Cecidomyia sp. Cecidium nov. 



On leaf, under side, small, smooth, spherical galls, with a 

 peculiar tip shaped like the end of a bottle, arising abruptly 

 from the globular gall, 2-23^ mm. diameter. The gall reminds 

 one of a miniature bomb. Green to yellowish with dark 

 spots over the distal half. Thin-walled. Attached by a 

 minute obconic pedicel. The pupa in these galls is suspended 

 in the upper part of the chamber by a thread passing from each 

 end of the body to the walls of the chamber. The galls drop 

 from the leaves in late July. Not common. 



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



Type specimens at Ohio State University. 



20. Caryomyia caryae O. S. 



On leaf, under side, sub-spherical gall with more or less 

 prominent apical nipple. 3-33^ mm. diameter, rarely 4 mm. 

 Light green, turning brown, smooth. In many, very definite 

 meridian-like striations can be observed marking the wall. 

 Wall thin, very fragile and dry. Surface of chamber smooth as 

 though polished. Attached by conic pedicel arising from 

 fovea in base of gall. This pedicel with its pointed end attached 

 to the leaf is surrounded by or rests in a cup-like structure. In 

 this respect the gall differs markedly from No. 22, which it 

 superficially very much resembles. • 



Fig. 20a is a large specimen showing the peculiar interlocking 

 base exceptionally well developed. 



Collected from //. alba and H. ovata, July and August. 



Felt, Jour. Econ. Ent. 4:456. 1911. 



21. Caryomyia holotricha O. S. 



On leaf, under side, large tawny, long-haired galls, dis- 

 tributed singly (Fig. 21) or massed (Fig. 21a) on the leaflet. 

 When massed they form a conspicuous brown, hairy structure, 

 suggesting a huge caterpillar. The isolated galls are sub- 

 globular to round-conic with or without a small terminal 



