80 DIASPINjE I SYNOPSIS OF GENERA. 



D. Puparium of the male coriaceous or horny ; 

 narrowly elongate, with the exuviae terminal. Re- 

 sembles that of the female, but much smaller. 



d. Circumgenital glands in adult female in not more 

 than five groups. Dorsal tubular spinnerets 

 forming irregular bands. Puparium of adult 

 female mytiliform ; exuviae terminal. Male 

 puparium with a hinge-like structure towards 

 the posterior extremity. 



(x) . . . . MYTILASPIS ( ( .)). 



d. d. Circumgenital glands in adult female in not 

 more than three groups. Dorsal tubular spin- 

 nerets absent or quite rudimentary ; their places 

 occupied by a large lattice-shaped thickening of 

 the dermis. Female pupanmn very lonir and 

 narrow ; male puparium not hinged. 



(Xl) . . . ISCHNASIMS (11). 



GENUS ASPIDIOTUS (Bouch). 



Female puparium more or less circular, rarely ovate ; 

 varies from low convex to limpet-shaped, or obconical. 

 Exuviae central or subcentral, invariably occupy the 

 highest portion, and are superposed; secretion a IT 

 covering either thin and transparent or thick and 

 opaque; that which covers the larval exnviie often 

 forms a nipple-shaped prominence. The thin secre- 

 tionary covering rarely remains intact for any length 

 of time, and when absent reveals the true character 

 and colour of the exuviae. 



Ventral scale usually remains attached to the plant, 

 and varies from a delicate farinose secretion to a stout 

 pellicle. 



Male puparium coriaceous or horny, oblong-ovate, is 

 much smaller, but generally resembles that of the 

 female. 



The females show great variation in the character of 



