288 THE COCCIDAE 



second pair of lobes, those of each lateris in two distant 



groups, two and one; genacerores 2-4(6-9)1-6. Australia 



defecta Mask. 



bb. Pygidium with median and second pair of lobes close together, 

 not as far apart as width of one of second lobes. 

 c. Pygidium with second pair of lobes distinctly narrower than 



median pair. 



d. Pygidium with median pair of lobes large, broadly rounded, 

 not notched, finely serrate; second pair of lobes minute, tri- 

 angular, adjacent to first lobe, margin irregular; plates 

 large, arranged 0, 0, 4, those of each lateris arranged two 

 adjacent to each second lobe, shorter than other plates, one 

 near middle, and fourth at cephalic end; genacerores 8-10 



(14-15)16-24. Australia on Banksia grandiloUs Mask. 



dd. Pygidium with median pair of lobes triangular. 



e. Pygidium with median pair of lobes with margin broad- 

 ly crenulate, triangular in outline with distal end bluntly 

 rounded; second pair of lobes broadly rounded, subtrian- 

 gular, near but not adjacent; plates apparently wanting; 



genacerores 4-6(6-8)8-10. Japan on Machilus 



machili Mask. 



ee. Pygidium with median pair of lobes with margin entire, 

 triangular in outline, apex nearer mesal margin, mesal 

 and lateral margins forming unbroken curve with distal 

 margin, lobes separate but close together, lateral mar- 

 gins oblique; second pair of lobes with mesal half al- 

 most as large as median lobe and of much same shape, 

 lateral half about one-half as broad, shorter and rectan- 

 gular; plates arranged 0, 1, 2-2-2, plates of median in- 

 cisura diverging caudad; altaceratubae arranged 1-2-2-1; 

 genacerores present; body with triangular process on 

 each side projecting cephalad of mouth-parts and margin 



slightly bulged out. Ceylon on Mesua ambigua Ruth. 



cc. Pygidium with second pair of lobes broader or subequal in 

 length with median pair, broadly rounded at distal end, mesal 

 margin notched; plates arranged 0, 1, 3, those of each lateris 

 placed equidistant from each other, all large; genacerores 



3-4(7-11)7-10. Australia on Casuarina casuarinae Mask. 



aa. Pygidium with second pair of lobes incised. 



b. Pygidium with median pair of lobes broadly rounded, entire; 

 second pair of lobes incised, mesal lobelet largest, both lobelets 

 notched; third pair of lobes rudimentary, incised, notched, irregu- 

 lar in outline; plates arranged 0, 2, 2, 1, situated on each lateris 

 near third lobe; genacerores 4-5(10-13)11-15. Australia on Eu- 

 calyptus, Acacia grisea Mask. 



bb. Pygidium with median pair of lobes with single mesal notch 

 and several lateral notches, bluntly pointed between notches; 

 second pair of lobes incised, entire, mesal lobelet twice as large 

 as lateral; third pair of lobes very small, entire, not incised; 



