TRIBE DIASPIDINI 351 



distant; altaceratubae not prominent; brevaceratubae 



not numerous. South Africa on aloe, grass 



humilis Brain, 

 ff. Species found in other parts of the world. 



g. Pygidium with anus located cephalad of vulva. 



h. Pygidium with four plates on each lateris, plates 

 stout, arranged 0, 1, 5-6, caudal plates much short- 

 er than cephalic, those of each lateris arranged 

 l-l-lor2-2or3 ; median pair of lobes small, di- 

 vergent, serrate; second pair of lobes incised, 

 mesal lobelet larger than lateral, entire, rounded, 

 spatulate; brevaceratubae with two oraceratubae 

 in each second row, third row with 4 in mesal 

 and 3 in lateral group, fourth row with 5 mesal 

 and 4 lateral; anus nine times its width from 

 caudal margin and less than once cephalad of 

 vulva; mesospiracerores present; genacerores 4-8 

 (9-16)11-18. Ceylon on Eurycles, Myristica, 



mango. dilata Green. 



hh. Pygidium with three plates on each lateris, plates 

 dagger-like, arranged 0, 1, 3, those of each lateris 

 arranged 1-1-1; median pair of lobes broad, not 

 prominent, confluent at proximal end, divergent, 

 slightly constricted at middle, distal end truncate, 

 entire or faintly serrate; second pair of lobes in- 

 cised, small, mesal lobelet largest, triangular; 

 anus located eleven times its width from caudal 

 margin and four times cephalad of vulva; breva- 

 ceratubae with three mesal oraceratubae and five 

 lateral; genacerores 4-5(11-13)15-17. Australia on 

 Leptospermum. angusta Green. 



gg. Pygidium with anus and vulva superimposed. 



h. Pygidium with seven or more plates on each lat- 

 eris. 



i. Pygidium with genacerores 6-8(10-12)8-12; me- 

 dian pair of lobes large, oblique, confluent at 

 proximal end, mesal margin serrate; second 

 pair of lobes incised, mesal lobelet three times 

 size of lateral; plates slender, arranged 0, 1, 

 7, those of each lateris arranged 1-1-1-4; anus 

 and vulva superimposed, anus five times its 

 width from caudal margin. North Carolina on 



Nyssa nyssae Comst. 



ii. Pygidium with genacerores 7-8(14-19)14-16; 

 median pair of lobes large, oblique, confluent 

 at proximal end, mesal margins serrate; sec- 

 ond pair of lobes incised, mesal lobelet larger 

 than lateral, margins entire; plates longer 

 than lobes, arranged 0, 1, 8, those of each lat- 



