414 THE COCCIDAE 



ft Pygidium with median pair of lobes not or only slightly 

 longer than width of anus. 



g. Pygidium with median pair of lobes quadrangular, 

 close together, two distinct lateral notches, mesal 

 wanting; plates short and inconspicuous; anus large, 

 less than twice its own width from caudal margin; 

 dorsal oraceratubae numerous, confined chiefly to two 

 irregular, double, lateral rows; calles not especially 

 prominent, mesal calles distant from each other and 

 from lateral calles; genacerores (3-9)3-8. New Mex- 

 ico on cottonwood popularum Marl. 



gg- Pygidium with median pair of lobes quadrangular, 

 single large lateral notch; plates small, arranged 0, 

 4-6, those of lateres arranged 2-1 to 3-1 or more, one 

 of second group furcapectina; anus small, two or 

 three times its own width from caudal margin ; dorsal 

 oraceratubae fairly numerous; mesal calles fused; 

 genacerores 0-3(9-14)6-9. Aspidiotus aesculi solus 

 Hunter. Kansas on Juglans solus Hunter. 



cc. Pygidium with single pair of densariae, located in second in- 

 cisurae, subequal in length, if third incisurae with densariae, 

 these very small; lobes subquadrangular, nearly as broad as 

 long, not strongly projecting, distinct lateral notch, mesal want- 

 ing; plates small, inconspicuous, arranged 0, 3, those of each 

 lateris arranged 1-2 in incisurae: setae about as long as or 

 longer than lobes; lateres entire; anus five times its width from 

 caudal margin; calles not fused, not prominent, mesal calles 

 fused, distant from oblique lateral calles; genacerores (5-17) 

 4-11. California on Aesculus. aesculi Johns. 



SPECIES OF CHRYSOMPHALUS 



a. Pygidium never with more than five pairs of paraphyses. 

 b. Pygidium with three pairs of paraphyses. 



c. Pygidium with first pair of paraphyses longest, cephalic end 

 enlarged, knob-like, second pair similar in form, shorter, third 

 pair about one-half length of first pair, not enlarged at cephalic 

 end; median pair of lobes longest, faint mesal and lateral 

 notches, bluntly pointed; second, third, and fourth pairs blunt- 

 ly pointed, second pair smaller than others, much nearer me- 

 dian lobe than third; pectinae small, obscure, arranged 2, 2, 

 3, 3, 0; lateres practically entire; genacerores forming almost 



continuous arc, 75-100 cerores. Ceylon on Murraya 



quadrlclavatus Green. 



cc. Pygidium with first pair of paraphyses about one-half length 

 of subequal second and third pairs, these latter enlarged at 

 cephalic end, club-shaped; median pair of lobes subtriangular, 

 lateral margin oblique, emarginate, serrate; second ind third 

 pairs of lobes similar to median and subequal, serrate; pectinae 

 short, arranged 2, 2, 2, 0; each lateris serrate, bearing many 



