Genera of FeYidsd and Canidse. 99 



The absence of the second inferior tubercular molar is also not 

 uncommon in the " black-and-tan " terrier. 



I do not see the propriety of retaining the generic name 

 Nyctereutes, Temm., for the Cam's proeyoninus of Japan. 

 The peculiarity it presents in the form of the first superior 

 tubercular molar, the only one* on which the genus reposes, 

 I would regard as specific only. 



VULPES. 



I would, with Gill, refer to this genus the species men- 

 tioned by Gray and others under the generic names Pseuda- 

 lopex, Fennecus, and Leucocyon. The form of the postfrontal 

 process certainly does not furnish generic characters. 



Urocyon, Baird. 



The peculiar cranial ridges, in which this genus resembles 

 one of the extinct genera of Mustelidse, appear to me to be 

 the character which warrants its separation from Vulpes. 



Enhydeocyon, Cope. 



(Bulletin U.S. Geological Survey Terr. v. 56, 1879.) 



Two species from the "White-River beds of Oregon are 

 known. 



Tomaectus, Cope. 



(Ann. Report U.S. Geol. Surv. Terrs. 1873 (74), p. 519; 

 Paleontological Bulletin, 1873, Aug. 20.) 



One species known from the Loup-Fork beds of Colorado. 

 It is uncertain whether this genus has two or three premolars. 

 Should it have three, it must be compared with the Brachy- 

 cyon of Filhol. But the inferior sectorial tooth of that genus 

 is as yet unknown. 



Seeothus, Lund, 1843. Cicon, Hodgs. 



One extinct species of this genus was found by Lund in 

 caves in Brazil. Another species, Sjyeothus jprima>vus, is now 

 living in the Himalaya region. Several other recent species 

 have been named, but they are said by some authors to be 

 varieties only of the S. primaivus. 



Synagodus, Cope, gen. nov. 



The characters of this genus have been pointed out in the 

 analytical key. They are evidently as important as those 



* According to the figures of Temminck and Schlegel. 



