440 THE COCCIDAE 



middle, edges obscurely crenulate; pectinae large, narrow, 

 longer than lobes, arranged 2, 11, those of each lateris 

 close together; anus circular, located near proximal ends 

 of lobes; second and third incisurae with densariae. Mex- 

 ico on Cupressus. cupressi Ckll. 



cc. Pygidium with pectinae in median incisura, pectinae distinct, 

 comb-like, not notched, form of rounded knife-blades, arranged 

 2, 10, those of median incisura and of each lateris formed and ar- 

 ranged so as to make perfect contour with lobes; median pair 

 of lobes large, others wanting; cephalic end of pygidium with 



three transverse calles. Senegal, Africa on Balanites 



vuilleti Marchal. 

 bb. Pygidium without pectinae or plates in median incisura. 



c. Pygidium with about eight plates, adjacent to median lobe, on 

 each lateris; median pair of lobes quadrangular, distal end 

 truncately rounded, distinct mesal and lateral notches; den- 

 sariae marking position of second and third incisurae, mesal 

 margin of densariae of second incisurae much longer than lat- 

 eral; mesal and lateral calles distinct, subequal in length, eqi- 

 distant from each other. Illinois, New York, Kansas, Japap 

 on elm, Catalpa, Cycas. ulmi Johns. 



cc. Pygidium never with eight plates on each lateris adjacent to 



third lobe, usually few in number. 



d. Pygidium with median pair of lobes large, two prominent 

 lateral notches, mesal angle of each protuberant and round- 

 ed, mesal notches wanting; second and third pairs of lobes 

 marked by densariae; mesal margin of densariae of each sec- 

 ond incisura but little longer than lateral; much broader, den- 

 sariae of third incisurae not prominent; plates inconspicuous; 

 mesal calles subhyaline, inconspicuous, lateral calles dis- 

 tinct. Transcaspian Russia on Populus. transcaspiensis Marl. 

 dd. Pygidium with median pair of lobes large, each with single 

 prominent lateral notch, mesal margins straight, distant, dis- 

 tal ends bluntly rounded; plates and pectinae inconspicuous, 

 not as long as lobes, arranged 0, 2, those of each lateris ar- 

 ranged 1-1, cephalic one a pectina; densariae large, mesal and 

 lateral margins subequal; setae large, prominent, longer than 



lobes. not Aspidiotus alni Marchal. Austria on Quercus 



alni Lindgr. 



aa. Pygidium with densariae of second incisurae with mesal side great'y 

 elongated, straight, enlarged at apex, club-shaped, lateral margin 

 shorter and only slightly enlarged, mesal margin inversely carrot- 

 shaped; densariae of third incisurae subequal; median pair of lobes 

 with two small proximal processes; median pair of lobes rather long, 

 rounded, sometimes notched; second pair of lobes usually slightly 

 doubly concave; setae fairly large; plates minute, spine-like, hardly 

 to be seen, not detectable according to Newell; anus near caudal 

 margin, transverse; dorsal oraceratubae present. Mexico on Caesal- 

 pina. sttbstmiHs Ckll. 



