TRIBE DIASPIDINI 335 



lateral lobelet small, much smaller than mesal, 

 bluntly pointed, lateral notch; lateres irregular; 

 genacerores 3-4(4-9)8-13. South Africa on Cap- 

 paris. capparisi Brain. 



hh. Pygidium with two plates on each lateris. 



i. Pygidium with mesal lobelet of second pair of 

 lobes distinct, never inconspicuous; median pair 

 of lobes triangular, pointed, one or two mesal 

 notches, lateral margin oblique; second pair of 

 lobes incised, mesal lobelet entire, distal end 

 bluntly rounded, nearly twice as large as lat- 

 eral; plates small, slender, longer than lobes, 

 arranged 0, 1, 2, those of each lateris distant; 

 lateres irregular; genacerores 2-4(14-20)19-22. 

 South Africa on Euphorbia.__ettp7iorbiae Brain. 



ii. Pygidium with mesal lobelet of second pair of 

 lobes inconspicuous, narrowed toward proximal 

 end, spatulate, lateral lobelet smaller than 

 mesal, tapering; median pair of lobes conspicu- 

 ous, short, wide, divergent, truncate; plates ar- 

 ranged 0, 1, 2, those of each lateris arranged 

 one near second lobe and the other short dis- 

 tance cephalad; genacerores 4-8(13-15)19-21. 



West Australia on Agonis agonis Fuller. 



ff. Pygidium with four or more plates on each lateris. 

 g. Pygidium with second pair of lobes small and in- 

 conspicuous, mesal lobelet never subequal in size to a 

 median lobe. 



h. Pygidium with median pair of lobes large and 

 conspicuous. 



i. Pygidium with second pair of lobes incised, 

 lobelets subequal, similar, triangular, or slight- 

 ly truncate; median pair of lobes conspicuous, 

 apparently diverging, wide and short, distant, 

 entire; latadentes present cephalad of second 

 pair of lobes, three groups of two each on each 

 lateris; mesal margin of median pair of lobes 

 and median incisura thickened, horse-shoe- 

 shaped; plates long, slender, much longer than 

 lobes, arranged 0, 1, 3, those of each lateris ar- 

 ranged 1-1-1 and placed adjacent to and cephalad 

 of each group of latadentes, genacerores 5-5(11- 



15)15-21. West Australia on Eucalyptus 



ethelae Fuller. 



ii. Pygidium with second pair of lobes incised, 

 mesal lobelet three or four times size of lateral, 

 subtriangular, distal end bluntly rounded; 

 median pair of lobes large, projecting, mesal 

 margins oblique, undulate; plates large, dagger- 



