THE COCCIDAE OF SOUTHWESTERN UNITED STATES 



53 



but the type of which is supposed to be related to Aspidiotus. The type, 

 however, needs to be much more thoroughly elucidated before the validity 

 of the genus is at all established. 



Pseudodiaspis atriplicis n. sp. 



Fig. 27. 



Type host and locality. From Atriplex sp., along the river at the 

 foot of the butte at Tempe, Ariz. Also from Atriplex sp., near Barstow 

 and near Lone Pine, Cal. , 



Scale. Scale of the female circular, quite convex, white, with the 

 exuviae central. First exuvium naked, silvery in color; second exu- 

 vium covered by secretion. Ventral scale very thin. Scale of the male 

 resembling the female in texture but more elongate and with the exuvium 

 at one end; exuvium naked, silvery in color as in the female. 



Fig. 27. Pseudodiaspis atriplicis n. sp. : pygidium. 



Female. Length (flattened on slide) .8 mm. General form broadly 

 oval, with the posterior end slightly pointed. Cephalothorax somewhat 

 chitinized. Pygidium with the median lobes alone present, these quite 

 large, prominent, their mesal margins close together and parallel, their 

 lateral margins deeply once-notched. At the mesal, basal angle of each 

 lobe there is a stout spine. A similar spine marks the position of the 

 obsolete second and third lobes and there is another spine farther out 

 along the margin. All of these spines, except that at the base of the 

 median lobes, have their sockets surrounded by a rather large, chitinized 



