1. DIDBIPHIS. 321 



a'. Postorbital processes sharp, 

 pointed, prominent. Palate 

 imperfect, a second pair of 



TBCuitiesoppositeorbehindm.?. 2. D. oposmm,^. 329. 

 V. Postorbital processes small or 

 absent. Palate comparatively 



perfect 3. D. nudicaudata, p. 332. 



c^. Muzzle short, the distance from 

 postorbital processes to nasal tip 

 less than to occiput. Orbito- ~ 

 I temporal f ossse very long, their 

 length about equal to the dis- 

 tance between the zygomata. 

 c'. Top of muzzle very convex up- 

 wards. Crests and processes 



much developed 4. Z). crassicaudata, p. 334. 



. Brain-case large, its most constricted 

 part close behind, or even hidden be- 

 neath the postorbital processes. No 

 temporal crests, the temporal ridges 

 widely separate, 

 c^. Size medium, basal length more than 

 45 millim. P.^ minute. Canines 



very long. Broadest point of , [p. 336. 



palate at front corner of m.^ .... III. Subgenus Philanbee, 

 d^. Molars small and rounded. Lower J 5. D. philander, p. 337. 



jaw sharp-edged below ( 6. 2). lanigera, p. 339. 



d^. Size small, basal length less than 45 

 millim. P.^ not minute. Canines 

 medium or small. Broadest point 



of palate at back corner of m.^ ., IV. Subgenus Micottbeits, 

 e^. Nasals expanded behind. [p. 340. 



d^. Supraorbital ledges well deve- 

 loped, even in immature ani- 

 mals. Upper p.' and p.* 

 about equal, 

 o*. Upper ms.i-3 more than 7 

 milHm. Basal length about 



40 millim 7. B. dnerea, p. 342. 



6*. Upper ms.i-s about 6 or 6'5 

 millim. Basal length about 



30 to 36 millim 8. Z). mwrina, p. 343. 



c*. Upper ms.i-8 about 5 millim. 



Basallengthabout26miUim. 9. D. lepida, -p. Si7. 



e". No supraorbital ledges at any 



age. , _ _ 



d^. Upper ms.i-3 about 5 millim. 



Basal length about 24 



millim. Palatal foramen 



reaching to the level of the 



back of the canines 10. D. pusUla, p. 348. 



e". Upper ms.i-3 about 6 millim. 

 JBasal length about 30 

 millim. Palatal foramen 

 reaching to the level of the * 



back of p.^ 11. D. grisea, p. 349. 



/■'. (Cranial characters unknown.) 12. B. velutina, p. 351. 



