TRIBE DIASPIDINI 305 



GENERA OF DIASPIDINI 

 a. Pygidium always with one or more groups of genacerores. 



b. Female never transforming in puparium; scale rarely without 

 distinct second exuvia. 



c. Pyigidum never with more than five groups of genacerores. 

 d. Pygidium always with four or five groups of genacerores. 

 e. Pygidium always with plates in median incisura. 



f. Pygidium with plates of median incisura separate, prox- 

 imal ends, even if adjacent, not fused and never form- 

 ing fish-tail-shaped projection. 



g. Pygidium with two or three pairs of lobes, second 

 pair incised; genacerores in five groups.— Type, 



Diaspis juniperi Bouche Carulaspis MacG. 



gg. Pygidium with series of fifteen or more pairs of 

 lobe-like projections or latadentes; genacerores in 



four groups. Diaspidistis Hemp. 



ff. Pygidium with pair of plates in median incisura adja- 

 cent and fused at proximal end and with distal portions 



divergent, forming fish-tail-shaped projection 



Pseudoparlatoria Ckll. 

 ee. Pygidium never with plates in median incisura, frequent- 

 ly with pair of large setae that are plate-like in appear- 

 ance. 



f. Scale of adult female round or oval with exuviae usually 

 located just within or projecting slightly beyond the 

 periphery of the scale. 



g. Pygidium with plates in incisurae or on lateres or on 

 both. 



h. Pygidium with median pair of lobes, even if adja- 

 cent, never fused. 



i. Pygidium with rounded latadentes or plates in 

 incisurae other than median, never with trun- 

 cate lobe-like projections. 



j. Pygidium with oraceratubae of brevacera- 

 tubae arranged in crescentic transverse rows. 



k. Pygidium with caudal margin convex, 

 never concave with median pair of lobes 

 placed in concavity. — Type, Aulacaspis 

 pentagona Targ Pseudaulacaspis MacG. 



kk. Pygidium with caudal margin deeply con- 

 cave on meson, forming pygidial incision 

 with median pair of lobes located in con- 

 cavity. Aulacaspis Ckll. 



jj- Pygidium with oracertubae of brevaceratubae 

 arranged promiscuously, never in crescentic 

 transverse rows. 



