THE COCCIDAE OF SOUTHWESTERN UNITED STATES 



51 



Adult female. Derm membranous throughout except for the pygid- 

 ium. Abdominal segments projecting somewhat at the margins and 

 bearing numerous marginal gland spines and short tubular ducts. Dor- 

 sum of the abdomen destitute of submedian groups of ducts. Median 

 lobes small, wide apart, rounded, projecting but little. Second pair of 

 lobes very small, divided into two lobules, of which the inner is the larger. 

 Third pair of lobes nearly or quite obsolete. Between the first and sec- 

 ond lobes is a low gland prominence ; between the second and third pair 

 a gland spine followed by two low gland prominences ; beyond the posi- 

 tion of the third pair, a gland spine, a gland prominence and a series of 

 six or more single gland spines. The marginal tubular ducts are consider- 

 ably larger than those of the dorsum and their pores are surrounded by 

 chitinous rims. Dorsal ducts few; their arrangement may best be gath- 

 ered from the figure. 



Notes : I would call attention to the close resemblance of this species in all 

 essential characters to Epidiaspis pyricola (Del G.). I shall discuss the validity 

 of the genus Epidiaspis in another paper. 



Diaspis tourney i Ckll. 

 Fig. 26. 



Type host and locality. From Holacantha emoryi, near Maricopa, 

 Ariz. 



Fig. 26. Diaspis toumeyi Ckll. : pygidium of specimen from Holacantha. 



