THE COCCIDAE OF SOUTHWESTERN UNITED STATES 39 



marginal spines (Fig. 17E). Marginal spines rather large, quite close 

 together and set in a definite, single row. Anal cleft rather short. Anal 

 plates (Fig. 17C) of ordinary character, each with three apical setae, two 

 subapical setae and with a single small fringe seta on each side. Anten- 

 nae (Fig. 17A) long and slender, eight-segmented. Legs well devel- 

 oped, tarsus straight, nearly as wide as the tibia; digitules of the claw 

 but little expanded at the tip (Fig. 17B). 



First stage larva with a single large marginal spine in each stig- 

 matic cleft and with very small, slender marginal spines (Fig. 17D). 



Notes : This determination is based entirely upon general resemblance and 

 community of host. No other species of this genus are available for comparison. 



Genus PHILEPHEDRA Ckll. 



The original description of this genus mentions few or no characters 

 of generic value. The type of the genus, P. ephedrae (Ckll.), has the 

 appearance of a much elongate Pulvinaria and departs structurally from 

 the type of the latter genus only in the entire absence of differentiated 

 stigmatic spines, differing in this respect, however, no more than does 

 P. bigeloviae. Unfortunately no first stage larvae of P. ephedrae are 

 available and a comparison of this stage cannot be made. The species 

 described by Green as Philephedra theobromae has distinct stigmatic de- 

 pressions, but the stigmatic spines appear to be but little differentiated. 

 Whether it is truly congeneric with P. ephedrae remains to be seen. 

 Green has suggested that it might possibly be the same species, but this 

 unquestionably is not the case. 



Philephedra ephedrae (Ckll.). 

 Fig. 18. 



Type host and locality. From Ephedra sp., near Mesilla Park, N. 

 Hex. 



Material examined. From Ephedra sp., near Lancaster, Los An- 

 geles County, Cal. 



Habit. Before the formation of the ovisac the insect is quite flat 

 and of a mottled pinkish and greenish color. At maturity it forms a 

 smooth, white ovisac, 10 to 20 mm. long, of firm texture, not at all cov- 

 ering the dorsum. Cockerell speaks of the presence of some white secre- 

 tion on the dorsum, but this is not present in any of my specimens. 



Morphological characteristics. Length (flattened on slide) 7 to 8 

 mm. Width 2 to 2.5 mm. Derm membranous throughout. Stigmatic de- 



