TRIBE DIASPIDINI 347 



dd. Pygidium with plates of each lateris arranged in less than 

 three groups. 



e. Pygidium with plates of each lateris arranged in two 

 groups. 



f. Pygidium with plates of incisurae and lateres at least 

 twice as long as lobes. 



g. Pygidium with genacerores 4-8(12-18)14-16; median 

 pair of lobes rather small, divergent, distal ends 

 broadly rounded, hardly projecting, confluent; sec- 

 ond and third pairs of lobes greatly reduced in size, 

 incised, lobelets distinctly separated, broadly rounded, 

 entire, mesal lobelet larger than lateral; plates long, 

 stout, three or more times as long as lobes, arranged 

 0, 1, 1, 2, those of each lateris arranged 1-1; altacera- 

 tubae four on each side. Chionaspis pinifoliae 

 heterophyllae Cooley. Florida, Rhode Island on 

 Pinus. heterophyllae Cooley. 



gg. Pygidium with genacerores 5-8(20-25)21-21; median 

 pair of lobes large, prominent, divergent, confluent at 

 proximal end, distal portions broad, broadly rounded, 

 serrate; second and third pairs of lobes incised, 

 mesal lobelet much larger than lateral, truncate, en- 

 tire; plates long and slender, longer than lobes, ar- 

 ranged 0, 1, 1, 3, those of each lateris arranged 1-2; 

 altaceratubae at least four times its width from 

 caudal margin, probably cephalad of vulva. Japan on 

 Quercus. kinshinensis Knw. 



ff. Pygidium with plates of incisurae and lateres distinctly 

 shorter than lobes, lobe-like, arranged 0, 1, 1, 2, those 

 of each lateris arranged 1-1; cephalic one very broad 

 with margin serrate; median pair of lobes long, deeply 

 recessed, divergent, not confluent, coarsely serrate; 

 second and third pairs of lobes incised, constricted at 

 proximal end, distal portion dilated, broadly bluntly 

 rounded, subequal in size, entire; latadentes in second 

 and third incisurae and between plates of lateres, bear- 

 ing large oraceratubae ; vulva located between postgena- 

 cerores; altaceratubae apparently three on each side; 

 brevaceratubae small and few in number; genacerores 

 7-8(10-14)8-11. German East Africa on forest tree under 

 fungus. lutea Newst. 



ee. Pygidium with plates of each lateris arranged in a single 

 group. 



f. Pygidium with genacerores 10-10(22-26)19-26; median 

 pair of lobes large, widely divergent, broader than long, 

 confluent, serrate; second and third pairs of lobes in- 

 cised, distal ends broadly rounded, subequal in size, en- 

 tire; latadentes in second and third incisurae, bearing 



