DISCUSSION OF GENERA AND SPECIES 



Genus CHIONASPIS Sign. 



43 



This genus has been greatly restricted by Cooley, and in all proba- 

 bility justly so, but no provision has been made for the species that have 

 been excluded from it. Therefore, while accepting this restriction I am 

 still retaining in the genus such forms as C. spartirue Comst. and C. quer- 

 cus Comst., not caring at present to undertake the responsibility of denn- 

 ing new genera for them, however different they may be from the type of 

 Chionaspis. 



Chionaspis quercus Comst. 



Fig. 19. 



Common on the various species of Quercus and also on the tan oak, 

 Pasania densiflora. 



Of this species there are none but the rather crude figures accom- 

 panying the original description and a later note by Essig. I present a 



Fig. 19. Chionaspis quercus Comst.: pygidium of specimen from Quercus agrifolia. 



new figure. The original description is quite accurate, but I may note 

 that the dorsum of the abdomen is almost destitute of ducts and that there 

 are a few ducts and gland spines at the margins of each abdominal 

 segment. 



Chionaspis pinifoliae (Fitch). 



Abundant upon the numerous species of pines grown here as orna- 

 mentals. Also on Pseudotsuga taxifolia and Torreya calif ornica. It is 

 probably to be regarded as native. 



