TRIBE DIASPIDINI 309 



kk. Body with preabdomen asymmetrical, sini- 

 stral margin of four segments of preabdo- 

 men bearing large spine-like setae on 

 tubercle-like swellings of margin, wanting 

 dextral margin. Type, Chionaspis unilater- 



alis Newst. Sinistraspis MacG. 



jj. Pygidium with median pair of lobes located 

 on ends of projections forming lateral limits 

 of pygidial incision. Type, Chionaspis nudata 



Newst. Augulaspis MacG. 



hh. Pygidium of adult female always without plates, 

 i. Pygidium always with one or more pairs of dis- 

 tinct lobes, 

 j. Pygidium with three pairs of lobes. Type, 



Chionaspis africana Newst 



Gramenaspis MacG. 



jj- Pygidium with one pair of lobes. Type, Chi- 

 onaspis subnudata Newst. Contigaspis MacG. 

 ii. Pygidium without lobes, margins undulate. 



Type, Chionaspis simplex Brain 



Natalaspis MacG. 



gg. Insects always living in abnormal growths or galls 

 upon plants; scale of adult female lining cavity of 

 gall, exuviae placed in orifice of gall or wanting; 

 pygidium of adult female with triangular, median, 

 lobe-like projection. Type, Chionaspis galliformena 



Green. Parachionaspis MacG. 



dd. Pygidium with a single transverse group of genacerores 



Parlatoreopsis Lindgr. 



cc. Pygidium always with more than five groups of genacerores, 

 seven or more. 



d. Pygidium with oraceratubae of brevaceratubae arranged in 

 crescentic transverse rows; with at least one pair of lobes; 



scale of adult female pyriform, of male not carinated 



Poliaspis Mask. 



dd. Pygidium with oraceratubae of brevaceratubae promiscuous- 

 ly arranged, not in rows; lobes wanting. Type, Chionaspis 

 simplex Green. Poliaspoides MacG. 



bb. Female always transforming in puparium; scale of adult female 

 not with second exuvia. 



c. Pygidium of adult female with plates between median pair of 

 lobes. Cryptaspidus Lindgr. 



cc. Pygidium of adult female never with plates between median 

 pair of lobes, with deep pygidial incision with oblique distant 

 lobes. Cryptodiaspis Lindgr. 



aa. Pygidium always without groups of genacerores. 



