TRIBE DIASPIDINI 327 



gg- Pygidium with eight altaceratubae on each side; 

 lobes normal in position, not crowded onto Bub- 

 truncate caudal portion; median pair of lobes 

 slightly divergent, bluntly pointed or rounded, long; 

 second and third pairs of lobes incised, second pair 

 slightly larger than third, lobelets all similar in 

 form, distal end bluntly rounded, mesal lobelet larg- 

 er than lateral; plates long, much longer than lobes, 

 arranged 0, 1, 1, 5-6, those of each lateris arranged 

 l-l-3or4; genacerores 14-16(22-28)15-20; mesospira- 

 cerores and metaspiracerores present; anus superim- 

 posed over vulva or slightly cephalad. Ceylon on 



Hedyotis. hedyotidis Green. 



dd. Pygidium with median pair of lobes adjacent at least at 

 proximal end. 



e. Pygidium with median pair of lobes as long as or longer 

 than broad. 



f. Pygidium with four to nine plates on each lateris, rare- 

 ly with only three. 



g. Pygidium with mesal margins of median pair of 

 lobes straight, parallel, adjacent, distal margins 

 rounded, sides obscurely serrate; second and third 

 pairs of lobes incised, mesal lobelet of each lobe 

 three times size of lateral lobelet, entire or obscurely 

 serrate; plates not long, arranged 0, 1, 1-2, 7-9, those 

 of each lateris arranged 2-2-4-5; anus located dis- 

 tinctly cephalad of vulva; dorsal oraceratubae ar- 

 ranged in transverse rows; genacerores 10-25(18-35) 

 16-24. Massachusetts, Ohio, Missouri, Kansas, Ne- 

 braska, New Mexico, southern California on willow, 



cottonwood, poplar, honey-locust, butternut 



ortholoMs Comst. 



gg. Pygidium with mesal margins of median pair of 

 lobes distinctly divergent distad. 



h. Pygidium with genacerores arranged 37-37(41-43) 

 43-43; median pair of lobes large, adjacent at 

 proximal end, strongly divergent caudad, mesal 

 and lateral margins of each lobe convergent, meet- 

 ing in right angle, entire or slighly notched; sec- 

 ond and third pairs of lobes incised, mesal lobe- 

 lets of third pair larger than lateral; plates of 

 second incisura shorter than lobes, others longer, 

 arranged 0, 1, 2-3, 11-12, those of each lateris ar- 

 ranged 3-4-4or5; each lateris with three small 

 pyramidal projections between two caudal groups 

 of plates; dorsal oraceratubae conspicuous, ar- 

 ranged in rows. Japan on Elaeagnus 



difficilis Ckll. 



hh. Pygidium with genacerores never more than 

 19(44)30. 



