146 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 49. 



subsectorial. Incisors heavy, normal, crowns slightly grooved in un- 

 worn condition. Canine ovate at alveolus, slightly grooved on edges 

 of outer surface and flattened on inner surface. First upper premolar 

 single-rooted, second and third two-rooted, fourth three-rooted; pnv' 

 unicuspid, with well-developed cingulum shelf; pm* five-tuberculate, 

 with only rarely an indication of supplementary inner cusplet ; lower 

 premolars more rounded, less lengthened, than in Ailurus. Upper 

 molars usually without accessory cusplets, except on posterior border 

 of inner cingulum shelf of m*, which is much less developed than in 

 Ailurus ; first lower molar large, with heavy conical cusps. 



Subgenus EUPROCYON Gray. 



1864. Euprocyon Gray, Proc. Zool. Soc. London, 18C4, p. 705. 



1913. Euprocyon Goldman, Smiths. Misc. Coll., vol. 60, no. 22, p. 16, February 28. 



Type. — Ursus cancrivorus Cuvier. 



Characters. — Pelage short; hair reversed from withers to between 

 ears; claws heavier, straighter, broader, and more bluntly pointed 

 than in true Procyon; os penis only slightly bowed, without sharply 

 recurved distal end. 



Skull essentially as in true Procyon, but with bony palate extending 

 backward beyond plane of last molar a distance less than one-fourth 

 the entire length of palate. 



The teeth of Euprocyon, though obviously most resembhng those of 

 Procyon proper, show some tendencies of differentiation toward 

 Ailurus. Third upper incisor with posterior fold little developed. 

 The upper molariform teeth are broader, with better developed cin- 

 gulum shelves and heavier, more rounded-coniform cusps; pm* has 

 the deep valley between the paracone and hypocone not crossed by 

 a connecting ridge, the hypocone standing as an isolated cusp; m} 

 distinctly five-tuberculate (a well-developed protoconule present), 

 with additional accessory cusplet on posterior border of inner cingu- 

 lum. (Plate 39.) 



Subgenus PROCYON Storr. 



1780. Procyon Storr, Prodr. Meth. Mamm., p. 35. 



1795. Campsiurus Link, Beytr. Naturg., vol. 1, pt. 2, p. 87 (type, Ursus later 



LinnoBus, now selected). 

 1795. Lotor Geofproy and Cuvier, Mag. Enc, 1795, vol. 2, p. 187. 

 1816. Loler Oken, Lehrb. Naturg., 3ter Theil., 2te Abth., p. 1080. 

 1899. Mamprocyonus Herrera, Sin. Viilg. Cient. Vert. Mexicanos, p. 18. 



Type. — TJrsus lotor Linnseus. 



Characters. — Pelage longer than in Euprocyon; hair of neck not re- 

 versed; claws lighter, strongly curved, and sharply pointed; os penis 

 strongly bowed and sharply recurved at distal end. 



The bony palate extends backward beyond plane of last molar a 

 distance greater than one-fourth the entire length of palate, usually 

 nearly one-third. 



