FIELD BOOK OF MAMMALS 



many distinct sheep as recent lists would indicate, since the 

 range of individual variation is large and will account for 

 vsome of the supposed differences. 



Rocky Mountain Bighorn. — Ovis canadensis canadensis^ Shaw. 

 As described. Found from Alberta south through Colorado 

 to New Mexico and central Arizona; through eastern 

 Washington and Oregon. Plates I and XL. 



Audubon Bighorn. — Ovis canadensis auduhoni Merriam. 



As large or larger than typical canadensis; dentition much 

 heavier. Weights as given by Audubon, ram 344, ewe 240 

 pounds. Found formerly in the Badlands district along the 

 Missouri, Yellowstone, and Little Missouri Rivers, in 

 eastern Montana, Wyoming, North and South Dakota, and 

 western Nebraska. Said by Bailey, 1926, to be probably 

 extinct. 



Lava Beds Bighorn. — Ovis canadensis calif orniana (Douglas). 

 Darker in color than typical canadensis. Found in 

 "Formerly the Cascade Mountains of southern Washington 

 and Oregon, and Mount Shasta and the mountainous 

 country to the eastward in northern California; now prob- 

 ably extinct." (Allen — 1912) 



Galliard Bighorn. — Ovis canadensis gaillardi Mearns. 



Paler than typical canadensis, with shorter pelage and 

 longer, more pointed ears; rump patch less sharply differ- 

 entiated. Found in "Mountains of northwestern Sonora 

 and southwestern Arizona." (Allen) 



Sierra Nevada Bighorn.' — Ovis ca?iadensis sierrce (Grinnell). 

 Similar to typical canadensis, but "size slightly less, pelage 

 not quite so heavy, coloration very much paler, and horns 

 incross-sectionat base not triangular." (Grinnell) Found 

 in the high Sierras from Mono County south to the vicinity 

 of Mount Whitney, California. 



Texas Bighorn. — Ovis canadensis texiana Bailey. 



Color of- a September specimen: "upperparts, except the 

 usual large white rump patch, dull buffy brown or soiled 

 brownish gray; nose v/hitish; rump patch pure white with 

 median dark line very narrow and not continuous from tail 

 to dark area of back; belly white posteriorly; whitish lines 

 down inner side of hind legs to hoofs, and down front legs 

 usually only to dewclaws (in the type reaching to the 

 hoofs)." (Bailey) Resembling auduboni in heavy denti- 

 tion. Found in the Guadelupe Mountains of Texas and 

 New Mexico. 



^ Since the nomenclature of this field book follows that of Miller in 

 his North American Recent Mammals, no departure from it is made in 

 this case, but there are very good grounds for using the name cervina 

 for canadensis, which would make the first seven forms listed all sub- 

 species of cervina. 



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