DISCUSSION OF GENERA AND SPECIES 



15 



available is not large, but it is sufficient to indicate that there is either an 

 extraordinary amount of variation or that an indefinite number of species 

 separated by infinitesimally small characters must be recognized. The 

 examination of a large mass of material is needed before very definite 

 conclusions may safely be formed. 



Eriococcus adenostomae Ehrh. 



Fig. 2. 



Originally described from this area where it is quite common on 

 Adenostoma fasciculatum. It has been recorded from this host in the 

 southern part of the state also. 



Adult female with spines present both on dorsum and margins of 

 the body. Spines rather few, of varying sizes, those of the margins not 



Fig. 2. Eriococcus adenostoma Ehrh.: A, antenna of adult female; B, anal lobes, 

 dorsal aspect left, ventral aspect right ; C, types of spines ; D, wax duct. From 

 specimen from topotype material. 



or but. little larger than those of the dorsum, all small but relatively 

 stout and for the most part slightly curved, tapering regularly to the 

 blunt apex (Fig. 2C). On each abdominal segment there is a group of 

 three or four spines at each lateral margin, a median group and a sub- 

 median group of two or three spines on each side. Anal lobes (Fig. 25) 

 but little, or not at all, chitinized, each with three spines on the dorsum, 

 which are smaller than the largest body spines, and with two slender 

 setae on the ventral side. Ducts (Fig. 2D) with a deep and rather narrow 

 cup at the inner extremity. Antennae (Fig. 2A) noticeably short and 

 stout, normally 7-segmented. Legs likewise rather short and stout, the 

 claw with a distinct tooth beneath. Posterior coxae bearing numerous 

 rather large pores. 



