320 BIDBLPHTIDJS. 



j', MammsB three in centre, five 

 lateral pairs. Ears large. 



Sides grey 16. D. domestica, p. 368. 



k'. Mammse not known. Ears 



large. Head, rump, and tail 



red; fore-back and beUygrey 17. D. scahpa, p. 359. 



/■'. Size medium : lower leg 20-25 



millim. 



V. Mammae five in centre, and about 



ten lateral pairs. Ears small. 



Back grey ; sides red 18. 2). herueli, p. 360. 



ff'. Size small : lower leg less tban 

 20 millim. 

 m'. MammK not known. Ears 



medium. Sides rufous ...» 19. D. sorex, p. 362. 

 e'. Back liueated or spotted, 

 /i". Back with dark longitudinal lines. 

 n". Back with three lines. 

 (i*. Size medium. Head and 

 body more than 100 millim ; 



lower leg about 28 millim. 20. D, ammcana, p. 368. 

 e*. Size small. Head and body 

 less than 100 millim. ; lower 

 leg about 18 miUim.. . .... 21. Z). iheringi, p. 364. 



o'. Back with a single central line. 22. D. unistriata, p. 36& 

 i°. Back spotted with white. Size 



small , 23. D. alboguUata, p. 366.. 



II. Cbanial Charactbes. 



A. Size and cranial characters variable. 



Lower p.* generally shorter than p.' 



a. Brain-case small and narrow, its most 



constricted point some way behind 



the postorbital processes. Temporal 



crest present, at least in old age. 



a^. Size large, basal length more than 



75 millim. Temporal crest very 



large, early developed I. Subgenus Didblehyb, p. 322.. 



a' 1. 2). marsupialis, p. 323. 



6'. Size medium, basal length between 

 60 and 76 millim. Temporal crest 



smaller and later developed. H. Subgenus Mbtachibtjs, p. 328'.. 

 6'. Muzzle long, the distance from 

 postorbital processes to nasal 

 tip greater than that to occiput. 

 Orbito-temporal fossse short and 

 broad, their length much less 

 than the distance between the 

 zygomata. P.' much larger and 

 heavier than p.^, markedly sepa- 

 rated from it*. 



P.' not disproportionally larger thari, and nearly or quite 

 touching p.' M8.1-3 12 to 14 millim Chironeotes minimus, p. 368. 



