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. 
Fig. 1. Pygidium of female. 
Fig. 2. Dorsal marign of the pygidium of female. 
This species was found on Aesculus glabra on Ohio State 
University campus, March 24, 1!)05. 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 s])ines. 
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 micylus 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. 
