348 



Mr. R. I. Pocock on the 



The r. bevffaktiiis-tyTpe. 



IMosojitcrvgoid fossa parallel- 

 sided, with transverse anterior 

 edj-e. 



Base of cranium short ; bulla 

 more inflated in front ; occiput 

 narrower above, with its lateral 

 margins sloping inwards. 



The II. pardhwides-ty^e. 



Mesoptervgoid fossa narrow and 

 rounded in front. 



Base of cranium long ; bulla 

 narrower in front ; occiput more 

 widely rounded above, its lateral 

 margins more upright. 



Genus Dendrailurus, Severtz. 



Dendrailunis, Severtzow, 1858, p. 385, ; type colocoh, II. Smith 



(=sin'f/ilata, Wagn.). 

 Lynchaihirus, Severtzow, 1858, p. 385 ; type pajeros, Desm. 

 Pajeros, Gray, 1867, p. 269; ty^Q pajevos {=pampanus, Gray). 



Bistr. S. America : Guiana, Chili ; Uruguay to Patagonia. 



Two species, if distinct, namely colocolo and pajeros. 



Skull with the same general features as Rerpailurus, but 

 with widely diflerent bullse, which are not only more inflated 

 and globular, extending posteriorly as far as the inferior edge 

 of the foramen magnum and anteriorly almost as far as the 

 ridge of the condyloid surface of the mandible, but diff'er 

 in addition in the relatively enormous size of the outer or 

 auditory chamber, which recalls that of T. maniil. The 

 groove of the partition runs over the summit of the bulla 

 from the stylomastoid to a point just in front of the basi- 

 occipital suture. The partition itself is nearly vertical with 

 a convex inner wall. The external or auditory chamber is 

 as wide in front as the posterior chamber is behind and 

 projects forwards far in advance of the very narrow anterior 

 end of the posterior chamber. 



The following analytical kev to the genera of Felinae 

 epitomises their main characters ; but, although an attempt 

 has been made to juxtapose related forms, this method has 

 been purposely abandoned in some cases in the interests of 

 expediency in construction. For instance, Ictailurus and 

 Dtndrailurus have been widely separated from their allies, 

 Ictailurus beinsr, in my opinion, most nearly akin to 

 Dendrailunis to Herpailurus, the only 

 which brings DendraUurus and Trichce- 

 the table having been independently 



Zibethailurus and 

 cranial similarity 

 lurus together in 

 acquired : — 



Very long upper canines and immense postcaniue 

 space ; chin long and vertical ; nasals broad 

 throughout ; their maxillo-premaxillary suture 

 aluiust straight ; postorbitai processes very short ; 

 occiput angular above Nenfelis 



"Without that combination of characters a. 



