DISCUSSION OF GENERA AND SPECIES 23 



Morphological characteristics. Dorsum quite uniformly beset with 

 moderately large spines (Fig. 8C) of various sizes, which are straight, 

 somewhat expanded at the base, tapering thence to the sharp point, those 

 of the margins but little or not at all larger than those of the dorsum. 

 Anal lobes ( Fig. SB ) weakly or not at all chitinized, each with three slen- 

 der setae on the ventral side and three spines on the dorsal side, these 

 resembling the majority of the body spines in form and size. Antennas 

 (Fig. SA) moderately stout, 7-segmented. Legs rather slender, the tibia 

 and tarsus sub-equal, the claw with a tooth, the posterior coxae with many 

 pores on one side. Ducts (Fig. SD} of two sizes, both with the cup quite 

 deep, the smaller with it somewhat asymmetrical. Anal ring with eight 

 setae, which are about half as long as the anal lobe setae. 



Notes : It is possible that this is E. dubius Ckll., which is a species of very 

 similar character, but I can not definitely connect the two and prefer to give this 

 a name. I have at hand specimens from Acacia paucispina, Prosopis velutina and 

 P. glandulosa all taken in Arizona, which are possibly this species. 



Genus GOSSYPARIA Targ. 

 Gossyparia spuria (Modeer). 



Very abundant on elms on the campus of Stanford University and 

 probably to be found in other parts of this area. 



Genus KERMES Boitard. 



This genus seems in general to have been somewhat misunderstood, 

 probably in large part because the adults are difficult to study morphologi- 

 cally and because the immature stages have been studied but little. The 

 genus has been placed by some authors in a distinct subfamily, the Hemi- 

 coccince. It should be pointed out that if such a subfamily be recognized 

 the name should stand as Kermesina, there being no genus Hemicoccus. 

 Cockerell, however, has assigned the genus to the tribe Eriococcini of the 

 subfamily Dactylopiince, a position that is without much doubt correct. 

 At least the genus is a member of the group (whatever value may be as- 

 signed to it) to which Eriococcus belongs. The first stage larva, the 

 wax ducts and the antennae are strictly of the Eriococcine type. 



The separation of the various species of this genus has usually been 

 attempted from a consideration of the adult female without reference to 

 morphological characters. Owing to the extreme chitinization of the 

 derm at maturity it is practically impossible to obtain slide mounts in 

 which anything of value can be seen; but if specimens be taken early in 

 the last instar, before this chitinization has begun, the various structures 



