124 REPORT UPON A COLLECTION OF 



subcircular, with the exuviae subcentral, covered with secretion ; ventral 

 scale thick, composed in part of the ventral portion of the second exuvium. 

 Scale of male quite elongate oval, with the exuvium at one end, in color 

 and texture resembling that of the female. 



Fig. 4S.Aspidiotus chortinus n. sp. : A, adult female; B, pygidial margin of 

 first stage; C, antenna of first stage. 



Morphological characteristics. Adult female (Fig. 45 A) 1.5 mm. 

 long, of ordinary form; derm membranous or with the anterior portion 

 of the cephalothorax somewhat chitinized. 



Pygidium (Fig. 44) rather short and broad, with the median lobes 

 alone well developed, these large and broad, the lateral margins parallel, 

 the apex truncate and with two deep notches. Second lobes broad and 

 very low. Spines at the bases of the lobes quite long and conspicuous. 

 Plates small but numerous ; one or two that are very small, between the 

 first and second lobes, and as many as ten beyond the second lobes, these 

 variable in form, some being simple, others slightly branched. Dorsal 

 ducts very few, small and slender, arranged as indicated in the figure. 

 Anal opening quite large, scarcely more than twice its own diameter 

 from the posterior margin. Ventral side with a very few small ducts, 

 without paragenital pores. Vaginal opening flanked by a pair of elongat- 

 ed chitinized areas. 



First stage with the antennae (Fig. 45C) 5-segmented, the terminal 

 segment quite elongate and annulate; pygidium (Fig. 45B) with two 

 pairs of widely separated lobes, the outer pair very small. 



Notes: This species is very close to A. graminellus Ckll., a species that has 

 been recorded from Colorado and New Mexico. It differs chiefly in the much 

 greater development of the plates, both in number and size, and in the much 

 fewer and smaller dorsal ducts. It is possible that it will prove to be a sub- 

 species of graminellus. 



