RACCOONS OF NORTH AND MIDDLE AMERICA 25 



Genus PROCYON Storr 



Procyon Storr, Prodr. Meth. Maipmal., p. 35. 1780. Type Ursus lotor Linnaeus. 



Campsiurus Link, Beytr. Natiirg. 1 (2): 87, 1795. Type Ursus Infnr Linnaeus 

 (see Hollister, p. 146, 1915). 



Lotor Geoff roy and Cuvier, Mag. Enc. 2: 187, 1795. 



Lotor Oken, Lehrb. Naturg., 3'" Theil., 2"= Abth., p. 1080, 1816. 



Euprocyon Gray, Zool. Soc. London Proc. 1864: 705 (subgenus). Type Ursiis 

 cancrivorus Cuvier. 



Mamprocyonus Herrera, Sin. Vulg. Cient. Vert. Mexicanos 1899: 18. 



Euprocyon Goldman, Smithsn. Misc. Coll. 60 (22): 16, Feb. 28, 1913 (genus). 



Euprocyon Hollister, U. S. Natl. Mus. Proc. 49 (2100): 146, Aug. 13, 1915 (sub- 

 genus) . 



Distribution. — Southern Canada to southern Brazil and northern 

 Argentina, and some of the outlying islands. 



Generic characters. — Form robust ; head broad, with short, pointed 

 muzzle; ears medium-sized, pointed ; upj)er lip hairy across median line; 

 soles of feet naked, smooth, without well-developed digital pads; digits 

 free, very long, the first more than half the length of the second; claws 

 nonretractile; tail shorter than body, cylindrical, distinctly annulated; 

 baculum long, curved and bilobed distally; mammae 6, arranged in 

 three pairs, as follows: pectoral, 2; abdominal, 2; inguinal, 2. 



Skull broad and massive; rostrum broad; brain case broad posteri- 

 orly, tapering gradually anteriorly; interorbital and postorbital con- 

 strictions moderate; postorbital processes of maxillae usually more 

 developed than postorbital processes of frontals; sagittal crest high 

 and trenchant in some old adults, absent in others, the temporal ridges 

 not uniting along median line. Mastoid processes long, stout, strongly 

 everted, rounded distally; hamular processes rounded, with knob-like 

 ends; auditory bullae large, inflated on inner side, the outer side 

 sloping grathuilly to external auditory meatus. Mandible heavy, 

 inferior border evenly rounded; symphysis short; coronoid process 

 rising high and curving backward over condyle. 



Dental formula: i 3/3 c 1/1 pm 4:14: m 2/2=40. 



Dentition heavy; molar crowns moderately high, with prominent 

 cusps; first and second upper premolars simple luiicuspids; third upper 

 premolar with a high conical principal cusp and a postero-internal 

 shelf-like cingulum sometimes bearing a small cusplet; crown of fourth 

 upper premolar subquadrate, about as long as broad, with five prin- 

 cipal cusps; crown of first upper molar usually slightly broader than 

 long, with four principal cusps; second upper molar sub triangular, w^ith 

 three principal cusps; crown of first lower molar elongated, sub- 

 rectangular, with five distinct cusps. First upper premolar with a 

 single root; second and third upper premolars 2-rooted; fourth upper 

 premolar 3-rooted. Incisors heavy, the crowns more or less distinctly 

 grooved when unworn. Canines oval in cross section at alveoli, 



87G119°— 50 3 



