480 URSUS. 
Fig. LXV. URSUS HORRIZUS. MEXICAN GRIZZLY BEAR. 
477. horrizus (Ursus), Baird, Mex. Bound. Surv., Mamm., 11, 1859, 
p. 34. Elhot, Syn. N. Am. Mamm., 1901, p. 312: 
MEXICAN GrRizzLy BEAR. 
Type locality. Los Nogales, State of Sonora, Mexico, near border 
of Pima County, Arizona. 
Geogr. Distr. States of Chihuahua and Sonora, Mexico, north to 
Colorado, Utah, and southern California. 
Genl. Char. Size large; frontal region highest between post- 
orbital processes; sagittal crest prominent; skull long, narrow. 
Color. Variable as in northern grizzlies; general hue dark. A 
large specimen from Casas Grandes, Sierra Madre, State of Chihuahua, 
Mexico, has head and back mixed dark brown, black, and yellowish 
gray, and with a jet black patch between the shoulders; rump, legs, 
and sides black; chest and under parts dark brown; nails brownish 
white. 
Measurements. Skull of the Casas Grandes specimen. Occipito- 
nasal length, 310; Hensel, 312; greatest length, 368; zygomatic 
breadth, 197.5; width across postorbital processes, 108; length of 
nasals, 86; width anteriorly, 37; mastoid breadth, 146; palatal length, 
137; anterior margin of foramen magnum to palatal arch, 146; length 
