THE COCCIDAE OF SOUTHWESTERN UNITED STATES 



67 



Scale. Scale of the female high convex, circular, with the exuviae 

 subcentral and covered with secretion. The secretion covering the exu- 

 viae is white, that of the remainder of the scale brown. Ventral scale 

 quite thick. Scale of the male resembling that of the female in color and 

 texture, but oval in form and with the exuvium near one end. 



Fig. 38. Chrysomphalus covilleae n. sp. : pygidium. 



Female. Length 1 mm.; of ordinary form; derm membranous 

 throughout, except for the pygidium, which is heavily chitinized. Mar- 

 gin of the pygidium with four pairs of lobes or lobe-like projections, 

 these all more or less irregular in form and appearing somewhat like 

 teeth. Each lobe with a small spine at its outer basal angle. Plates 

 lacking. A short thickening extends into the pygidium from the inner 

 basal angle of each median lobe and the margins of the first and second 

 poriferous furrows show similar, but longer thickenings. Dorsal pores 

 very abundant, their ducts long and filiform, arranged for the most part 

 in three furrows as indicated by the figure. Ventral side of the pygidium 

 with three rows of small pores which perhaps communicate with ducts. 

 Circumgenital pores lacking. 



Notes : A considerable number of species of this type have been described 

 from Mexico and this may perhaps be one of them. However, few of these spe- 

 cies have been figured and from the descriptions alone I cannot connect this with 

 any of them. The bicolored scale of both male and female is quite striking. 



