New Species of Scale Insects. 385 



plates, the one next the fourth spine with two forks, 

 the others with three, as shown in the illustration. 

 Spines prominent ; the first pair near the lateral margin 

 of the base of the median lobes; the second on the 

 lateral margin of the base of the second lobes; the third 

 and fourth on the body margin between the plates as 

 described above. There is a deep incision between the 

 lobes and also laterad of the second lobe. Anal opening 

 conspicuous, and about as far from the base of the me- 

 dian lobes as the lobes are long. 



This species was found on leaves of sugar maple, Acer 

 saccharinum, received from Dr. Jacob Schneck, of Mt. 

 Carmel, Illinois, and from Mr. R. H. Pettit, of Ithaca, 

 New York, and I have found it on sugar maple at 

 Champaign and Decatur, Illinois. 



Types in collections of the Illinois State Laboratory of 

 Natural History and of the United States National 

 Museum, and in the author's collection. 



This insect has been very abundant on sugar maple 

 for the past two years at Mt. Carmel, Illinois. It at- 

 tacks the leaves, living in great numbers on the under 

 side (see Plate XXX., Fig. 1, a), and causing yellowish 

 spots on the upper surface. The spots become more 

 conspicuous as the insects mature, and the leaves fall 

 prematurely. It hibernates in the partially mature state 

 under the leaf buds. I have not found this insect on 

 any other tree than the sugar maple, and as it attacks 

 the leaves and is rarely found on the bi-anches, I have 

 proposed for it the popular name, "maple leaf scale." 

 The specific name proposed is in honor of Prof. J. H. 

 Comstock, of Cornell University, who first gave me in- 

 struction concerning this interesting group of insects. 



A. comstoclii is related to Aspicliotus uvcb Comstocl-:, but 

 its occurrence on maple and the concolorous exuvife 

 should facilitate its recognition. It is also near A. town- 

 sendi Ckll., a species recently described from Mexico. We 

 now have four closely allied forms, which Prof. Cockerell 

 has called the rivm group, and has arranged as follows: 



