326 



The Ohio Naturalist. 



[Vol. V, No. 6, 



surface, a spine slightly laterad of each corresponding dorsal 

 spine, except the one at the base of the median lobe. 



There are five groups of circumgenital glands. Median 

 group 3 to 7, generally 4 to 5 arranged in a single row, sometimes 

 grouped together, anterior lateral 12 to 15; posterior lateral 7 

 to 11. Dorsal pores numerous and quite prominent. 



Pygidiuni of female. 



Dorsal marign of the pygidium of female. 



This species was found on Aesculus glabra on Ohio State 

 University campus, March 24, 1905. While it resembles A. 

 ancylus, it is distinguished from this species by the shape and 

 character of the incisions and chitinous processes, the number 

 and arrangement of the median gland orifices, by the number of 

 spines and by the absence of the spine-like extensions of the 

 margin between the third and fourth pairs of spines. 



Aspidiotus ohioensis is close to A. aesculi and A. aesculus 

 sub. sp. solus. The spines are more numerous, the incisions are 

 not alike, and the median gland orifices more abundant. 



This is one of the several forms that may prove to be varie- 

 ties of Aspidiotus ancylus on a more exhaustive study. 

 A large number of mounts were made and the points men- 

 tioned were observed many times. 



The author is very grateful to Prof. Herbert Osborn for his 

 valuable suggestions in the above description and drawings. 



