RACCOONS OF NORTH AND MIDDLE AMERICA 55 



rows iisiially longer than in mexicanus. Compared with P. I. grinnelli 

 the brain case and interorbital region are narrower, and the anterior 

 frontal outline descends in a more nearly straight line from apex 

 immediately behind the postorbital processes — upper outline of 

 frontals a more evenl}^ convex curve in grinnelli. 



Measurements. — Type: Total length, 855 mm.; tail vertebrae, 295; hind foot, 

 128. Two adult males from Colorado River, Mexican Boundary, Ariz., respec- 

 tively: 950, 875; 405, 340; 135, 126. An adult female from same locality: 845; 

 305; 128. Skull: Type: Greatest length, 117.6; condylobasal length, 111.1; 

 zygomatic breadth, 77.8; interorbital breadth, 25.5; least width of palatal shelf, 

 13.5; maxillary tooth row (alveoli), 43.4; upper carnassial, crown length, 8.8, 

 crown width, 9.6. Two adult males from Colorado River, Mexican Boundary, 

 Ariz.: Greatest length, 133, 126.6; condylobasal length, 122.4, 120.6; zygomatic 

 breadth, 79.1, 78.6; interorbital breadth, 25.3, 24.8; least width of palatal shelf, 

 15.4, 16.8; maxillary tooth row, 46.6, 43.7; upper carnassial, crown length, 9.7, 

 8.6, crown width, 10.4, 9.5 An adult female from same locality: Greatest length, 

 119.6; condylobasal length, 114.1; zygomatic breadth, 77.1; interorbital breadth, 

 23.4; least width of palatal shelf, 14.6; maxillary tooth row, 41.7; upper carnassial, 

 crown length, 8.7, crown width, 9.3 



Remarks. — As the name indicates the present subspecies is charac- 

 terized by light coloration, a featiu'e shared with P. I. mexicanus. 

 The close alliance of P. I. paUidus and P. I. mexicanus is obvious but 

 differing coml)inations of cranial characters seem to warrant their 

 recognition as distinct, but not strongly marked forms. The type of 

 pallidus is an unusiuilly pale s]5ecimen as shown by comparison with 

 others from localities so near that they must be regarded as typical. 

 The type of P. I. ochraceus is a subadult male in rather faded pelage 

 to which the name is doubtless due. It is not satisfactorily separable 

 from P. f. pal/idus. 



Specimens examined. — Total ninnber, 29, as follows: 



Arizona: Colorado River, Mexican Boundary, 3; Fort Apache (25 miles south- 

 east), 1; Lakeside, 1 (skull only); Mellen, 1;-^ Phoenix, 1 ; Springerville (3 

 miles northwest), 2; Tempe, 1; Topock, 1; Wupatki National Monument, 

 Coconino County, 1. 



Baja California: Calexico (11 miles southeast), 1; Cocopah Mountains, 3 (skulls 

 only); New River (5 miles south of Mexicali), 1 (skin onl.y) ; Pascualitos 

 Laguna, 1; exact locality unknown, 1 (skull only). 



California: Colorado River (5 miles below Needles), l;^^ Colorado River (near 

 Pilot Knob), 1;26 Colorado River (20 miles north of Picacho), 1;26 New 

 River, Colorado Desert, 1 (type); Pilot Knob, 1; Potholes, l.^s 



Colorado: Navajo River, Archuleta County, 1 (skin only). 



Sonora: Sonoyta River, near Quitobaquito (type of ochraceus), 1. 



Utah: Pine Valley, 1 (skull only); Saint George, 1. 



28 Mus. Vert. Zool. 



