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



upper side of the leaf to mark the location of the gall beneath. 

 Resembles Caryomyia tiibicola O. S. but is certainly a different 

 species. 



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



Type specimens at Ohio State University. 



28. Cecidomyia sp. Cecidium nov. 



On leaf, generally upper side, delicate, small, sub-cylindric 

 galls, standing erect, 2-23^2 rnm. high, less than 1 mm. wide, 

 constricted proximally to the slightly flaring base. Distal end 

 marked off by a circular ridge, in the center of which is a rounded 

 nipple. This latter turns dark early. Gall light green, at 

 length turning brown. Arises from intervenal areas between 

 the smaller veins. On the under side of the leaf the gall above 

 is indicated by a minute dark area. Attached to leaf by minute 

 central pedicel. 



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



Type specimens at Ohio State University. 



29. Cecidozoon (Type undetermined.) Cecidium nov. 



On leaf, under side, rather large, pouch-like gall (5-6 mm. 

 long) arising from a principal vein. Shaped like a stout gourd, 

 it is bent over nearly recumbent against the blade of the leaf. 

 2-23/^ mm. wide. The proximal end is sharply constricted at 

 the minute point of attachment. The walls when collected 

 were light brown in color, sparsely covered with short white 

 hairs. Walls very thin and when dry brittle. Interior surface 

 smooth. Inconspicuous on the upper side of the leaf, except for 

 the minute pore next the vein. Two specimens from the same 

 leaflet. 



This gall differs so markedly from all the other cecidomyidous 

 galls of the hickories, that I am not certain just where to place it. 

 They contained no occupants of any kind. 



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



Type specimens at Ohio State University. 



30. Cecidomyia sp. Cecidium nov. 



On leaf, under .side, obconic gall resting in firm collar-like 

 base. Somewhat similar to 31, but differs in definite constant 

 characters to make it distinct. Proximal end not rounded but 

 definitely conic, distal broad end with prominent fovea in the 



