44 



SCALE INSECTS OF SANTA CRUZ PENINSULA 



Chionaspis spartinae Comst. 



Fig. 20. 



Found, in this area, only on a salt marsh grass, Spartina stricta, about 

 San Francisco Bay. 



Fig. 20. Chionaspis spartirug Comst. : pygidium of specimen from California ma- 

 terial. 



I present a new figure of the pygidium. The dorsum of the abdomen 

 is practically destitute of ducts, but there are numerous small ducts at 

 the lateral margins and there is a more or less well-defined row of large 

 ducts anterior to those shown in the figure. There are no gland spines 

 anterior to the pygidium. 



Genus DIASPIS Costa. 



With this genus I am uniting Epidiaspis Ckll. In characterizing 

 Epidiaspis originally as a subgenus of Diaspis, Cockerell has stated that 

 D. piricola (the type of the former genus) "has the club-shaped glands 

 at the bases of the lobes, as in Diaspidiotus, and I think that it is related 

 thereto rather than to Diaspis." As a matter of fact, these "club-shaped 

 glands," which are not glands at all, but merely chitinous thickenings, are 

 morphologically very different from the thickenings seen in Aspidiotus. 

 In the latter genus these thickenings bound the margins of the poriferous 

 furrows, while in D. piricola they are the much enlarged thickenings that 



