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



light greenish yellow. Interiorly a more or less prominent 

 nipple projects inward from the distal end of the chamber, 

 traversed by the apical pore. Toward maturity the interior 

 wall is reddened. Gall attached by a short, cylindric pillar, 

 extending from the leaf into the base of the globular structure. 

 At the end of summer the galls fall from the leaf, leaving this 

 pedicel on the leaf. Galls when found are apt to occur in 

 large numbers, as many as 50-60 commonly being found on a 

 single leaflet. 



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



Type specimens at Ohio State University. 



23. Cecidomyia sp. Cecidium nov. (?) 



Leaf, under side, depressed (door-knob-shape) closely sessile 

 on leaf attached by a very short stout pedicel. 3-4 mm. wide, 

 2-2}/^ mm. high. Greenish to dull brown, covered with short, 

 thin pubescence or smooth. Interiorally from both the prox- 

 imal and distal sides, truncated, conic processes extend inward, 

 meeting in the center. From the end of the upper one numer- 

 ous, very coarse trichomes radiate into the gall chamber, which 

 are white at first, turning brown. The central tissue and the 

 walls are of a firm, fleshy character. There is commonly a 

 more or less definite fovea, exteriorly at the distal end. 



Collected in southern (Hocking County) and northern (Lake 

 County) Ohio on H. ovata. 



Thompson briefly describes and illustrates a gall similar to 

 the above which Felt as editor called Caryomia thomsoni. The 

 illustration, 'however, shows the gall not be to Felt's C. thomp- 

 soni as he has described it, viz., "Globose, with long, erect, 

 reddish, fuscous hairs." 



Felt, Bull. Brooklyn Ent. Soc. 8:99. 1913. 



Thompson, Illus. Cat. Am. Ins. Galls, p. 56, pi. 12, Fig. 227. 



24. Cecidomyia sp. Caryomyia similis Felt (?) 



On leaf, under side, large, globular, 4-5 mm. dia. Light 

 yellow-green to brown, surface puberulent. A minute nipple 

 terminates the gall. Walls thin. Attached by a short pillar, 

 over which the basal part of the sphere fits like a cap. Surface 

 of leaf not noticeably raised on side opposite the gall. 



Collected on //. microcarpa in Ohio and //. glabra in 

 Connecticut. 



