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



it appeared as if the rim of the gall had developed by pushing 

 out beneath the original apical tissue. After the disk falls, 

 only a minute dark spot marks the apex of the gall. The 

 surface of the under half of the gall, below the flaring, lacerate 

 rim, is more or less pubescent. 



Chamber comparatively large; walls thin. 



This very striking gall has thus far only been collected by 

 Mr. Sears and myself, both times in northern Ohio and occurring 

 on H. ovata. 



Some specimens, all occurring on the same leaf varied in 

 that they were not so depressed (almost sub-hemispheric) and 

 had the rim strongly inturned against the very convex distal 

 half of the gall. 



Sears, Ohio Nat. 15:380. 1914. 



33. Cecidomyia? sp. 



On leaf, blister-like, irregularly circular in outline, 23/2~33/^ 

 mm. diameter, 3^2 mm. thick. Extends above and below about 

 equally. Sometimes a slight central nipple is formed below 

 Greenish to brownish with discolored margin. 



Collected in Vinton County, Ohio, on //. cordijormis. 



Probably same as Felt's "Leaf blister gall, irregular, dull 

 greenish or black margined with small nipple. Diameter 3mm." 



This type of gall is so different from all the other cecidomyid 

 forms that it is doubtful if it is a member of that group. It may 

 possibly be an immature or small Phylloxera gall. The writer 

 found white larvae within his specimens, but was unable to 

 determine them as cecidomyid larvae. This gall is thus intro- 

 duced here, provisionally. 



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



