COCCIDAE FROM LOWER CALIFORNIA 



103 



Pseudodiaspis magna n. sp. 



Figs. 23, 24, 25, 26B. 



Type from an undetermined shrub on the beach at La Paz. 



Habit. Occurring on the stem and twigs of the host. Scale of 

 the female 3.5-4 mm. in diameter, nearly circular, flat, white or gray 

 and of very firm texture; exuviae submarginal, the first naked, the 

 second normally covered with secretion. Scale of male resembling 

 that of the female in color and texture, slightly elongate with the 

 exuvium at one end. 



Fig. 23. Pseudodiaspis magna n. sp. : A, adult female ; B, pygidium of first stage ; 

 C, extremity of microduct; D, antenna of first stage. 



Morphological characteristics. Adult female (Fig. 23 A) 2.5 mm. 

 long, form somewhat elongate, the cephalothorax not separated from 

 the abdomen by a constriction. Derm at maturity everywhere heavily 

 chitinized. Abdominal segments with at the most a single gland spine, 

 but with many small ducts at each lateral margin and with submedian 

 groups of ducts on the dorsum. 



Pygidium (Fig. 24) large and heavily chitinized, with two pairs 

 of lobes which, relatively to the rest of the pygidium, are very small. 

 Median pair (Fig. 26B) rather widely separated, their mesal margins 

 diverging somewhat, the apex deeply notched. Second pair much 

 smaller than the first, tooth-like. Between the first and second pairs is 



