DISCUSSION OF GENERA AND SPECIES 19 



Morphological characteristics. Spines rather few but present over 

 the entire surface of the dorsum, not arranged in definite rows. The 

 spines are of various sizes, but the largest of the marginal spines are 

 scarcely or not at all larger than those of the dorsum. In form (Fig. 5) 

 they vary from moderately to very stout and are for the most part 

 straight or very slightly curved, slightly expanded at the base and then 



Fig. 5. Eriotoccus pcenulatus n. sp. ; types of spines. 



tapering in a smooth curve to the bluntly rounded apex. Anal lobes 

 weakly chitinized, each with two slender setae on the ventral side and 

 three spines on the dorsal side, these somewhat more slender but about 

 the same length as the largest of the body spines. Antennas 7-segmented. 

 Legs with the tarsus slightly longer than the tibia, the claw with a tooth, 

 the posterior coxae without pores. Tubular ducts with the cup quite deep, 

 nearly symmetrical. Anal ring with eight setae, the longest of which are 

 about half as long as the anal lobe setae. 



Notes: I have found this species in but a single restricted locality and there 

 in but small numbers. It somewhat resembles E. villosus n. sp., the description 

 of which follows, but the spines are consistently stouter, larger and more bluntly 

 tipped and the posterior coxae are destitute of all but a very few minute pores. 



Eriococcus quercus (Comst.) 



Fig. 6. 



1915. Ericoccus quercus (Comst.) ; Essig, "Injurious and Beneficial Insects of 

 California," ed. 2, p. 121, fig. 103. 



Within this area this species has been taken only from Quercus agri- 

 folia at Palo Alto. It is a widely distributed species, occurring through- 

 out the United States on various species of oaks. 



Essig (ref. cited) has given an excellent figure of the sac, and a de- 

 scription of this may be omitted, but I append the following notes on the 

 insect itself. 



Adult female with the dorsum uniformly beset with numerous rather 

 large, slender, tapering, curved, and slightly pointed spines (Fig. 6C), 

 those along the margins being somewhat larger than the others. Anal 

 lobes (Fig. 65) heavily chitinized, rather cylindrical, their mesal margins 



