RACCOONS OF NORTH AND MIDDLE AMERICA 73 



Distribution. — Known only from Maria Madre Island. Tropical 

 Zone. 



General characters. — Closely resembling P. i. incinus of Maria Mag- 

 dalena Island, but dorsum less conspicuously overlaid with black, and 

 top of head grayer; cranial characters distinctive. 



Color. — About as set forth for the species as a whole, differing only 

 slightly from P. i. vicinus in the somewhat lesser amount of overlying 

 black. 



Cranial characters. — Skull very similar to that of P. i. vicinus, but 

 brain case less highly arched; lambdoid crest more broadly spreading, 

 not rising so high over foramen magnum; basioccipital, basisphenoid, 

 and palatal shelf broader; palatal ridges (extending posteriorly to 

 pterygoids) more widely separated; pterygoids thicker, the posterior 

 ends more strongly everted and knob-like; maxillary arm of zygoma 

 with lower external border projecting as a distinct process separated 

 from outer alveolar border of molars by a deep notch (process absent 

 in incinus) ; zygomata very broad and heavy as in vicinus; foramen 

 magnum more decidedly wider than high (more nearly circular in 

 ricinus) ; dentition about the same. 



Measurements. — Type: Total length, 854 mm.; tail vertebrae, 286; hind foot, 

 132. An adult male topotype: 840; 264; 128. Skull: Type and an adult male 

 topotype, respectively: Greatest length, 121.8, 119; condylobasal length, 114.6, 

 114; zygomatic breadth, 86.4, 82.5; interorbital breadth, 27.8, 27.2; least width of 

 palatal shelf, 15.4, 14.3; maxillary tooth row, 43.6, 42.2 (alveoli); upper carnas- 

 sial, crown length, 8.6, 8.6, crown width, 9.3, 9.1. 



Remarks. — P. i. insularis requires close comparison only with P. i. 

 vicinus of Maria Magdalena Island. While cranial details appear to 

 be quite distinctive these insular forms are much alike in external 

 appearance. In the few specimens available, however, the black over- 

 lying the dorsum — rather thin in vicinu.^ — is further reduced in 

 insularis, leaving a coarsely grizzled effect. 



Specimen ft examined. — Six, all from the type locality. 



PROCYON INSULARIS VICINUS Xelsoin and Goldman 

 Maria Magdalexa Island Raccoon 



Procyon insularis vicinus Nelson and Goldman, Biol. Soc. Washington Proc. 44: 

 20, Feb. 21, 1931. 



Type locality. — Maria Magdalena Island, Tres Marias Islands, 

 Nayarit, Mexico (altitude 250 feet). 



Type.— No. 88982, male adult, skin and skull. United States National 

 Museum (Biological Surveys collection); collected by E. W. Nelson 

 and E. A. Goldman, May 27, 1897. 



Distribution. — Known only from Maria Magdalena Island. Trop- 

 ical Zone. 



876119°— 50 G 



