TRIBE DIASPIDINI 333 



rate; second pair of lobes rudimentary, sometimes obso- 

 lete, broader than long, broadly rounded, entire; plates 

 long, slender, longer than median lobes, arranged 0, 1, 3. 

 those of each lateris arranged l-(l-l) ; dorsal oraceratubae 

 in large, well marked groups or bands; anus between pre- 

 genacerores; mesospiracerores 4-5; lateres with irregular 



projections. Southwest Africa on Rhus 



mytilaspiformis Newst. 



dd. Pygidium with median pair of lobes quadrangular, distal 

 margin with mesal and lateral notches, rounded between 

 notches; second pair of lobes longer than broad, bluntly 

 rounded, one-half width of median lobe; altaceratubae in 

 nine pairs, arranged 1-2-2-2-2, their oraceratubae very large; 

 plates arranged 0, 1, 7, those of each lateris arranged 1-2-2-2, 

 placed between altaceratubae; brevaceratubae numerous, 

 prominent; genacerores 2-4(12-16)15-23; anus located about 

 eleven times its width from caudal margin. Australia on 

 Eucalyptus. frenchi Green. 



cc. Pygidium with median and second pair of lobes small and in- 

 conspicuous, delicate; median pair of lobes with sides sub- 

 parallel, distal end rounded, entire; second pair of lobes simi- 

 lar in form to median; plates longer than lobes, sharply point- 

 ed, proximal portion broad, arranged 0, 1, 2, one on each lat- 

 eris adjacent second lobe, other short distance cephalad; lat- 

 eres irregular, dentate; brevaceratubae apparently few; gena- 

 cerores 8-14(13-18)6-14. South Africa on aloe exalbida Ckll. 



aa. Pygidium with second pair of lobes incised. 



b. Pygidium with median pair of lobes with proximal portion of 

 their mesal margins contiguous, sometimes apparently fused. 



c. Pygidium with median pair of lobes smaller than mesal lobe- 

 let of second pair, broad, not prominent; second pair of lobes 

 entire, incised, mesal lobelet large, broadly rounded, broader 

 than long, projecting, three times as large as lateral lobelet; 

 plates on caudal portion about one-half size of those on cephalic 

 portion, arranged 0, 2, 9, those of each lateris arranged 2-2- (1-1) - 

 1-2; tooth-like latadentis near middle of each lateris; anus 

 distant from caudal margin; genacerores 10-10(14-14)10-15. 

 Algeria on Deverra bilobis Newst. 



cc. Pygidium with median pair of lobes distinctly larger than 

 mesal lobelet of second pair, subtriangular in outline, bluntly 

 pointed, crenulate, fused at proximal ends, mesal margins di- 

 vergent, lateral margins oblique; second pair of lobes incised, 

 mesal lobelet much larger than lateral, lobelets triangular, en- 

 tire; plates or furcapectinae, arranged 0, 0, 1; genacerores 

 5-7(8-14)19-25. Transvaal, Africa on Acacia caffra Brain. 



tob. Pygidium with median pair of lobes not with proximal portion of 

 mesal margins fused for short distance. 



c. Pygidium with two plates in each second incisura. 



