240 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. III. 



Color: Upper parts and sides varying in individuals from drab 

 gray or pale broccoli brown to hair brown; in some cases this sheep 

 appears almost white; chest and line along ventral surface and front 

 of. legs black or brownish black; head and neck hair brown, darker 

 than back in some individuals; drab-gray in the old ram; back part 

 of legs and inside of hind legs, narrow line in center of ventral sur- 

 face, caudal patch, nose around nostrils, and inside of ears white; line 

 across caudal patch from tail to darker color on rump (as in all moun- 

 tain sheep), and the tail brownish black. 



Measurements Female: Total length, 1450; tail, 120; hind foot, 

 375; ear, 114. Skull: total length, 283; occipito-nasal length, 226; 

 Hensel, 246; width between outer edge of orbits, 156; zygomatic 

 width, 124; length of nasals, 109; palatal length, 148; length of upper 

 tooth row, 84; length of half of mandible, 203; of lower tooth row, 82. 

 Horns: total length along curve, 310; circumference at base, 144; 

 spread at tip, 393. Head of old ram: total length, 330; width between 

 orbits, inner edge, 180; circumference of horn at base, 395; length 

 along outer curve, 850; spread at tips, 485. 



In my paper on the Mammals of the San Pedro Martir Mountains, 

 I referred the specimens of mountain sheep obtained by Mr. Heller to the 

 O. c. nelsoni with a doubt, as I had had no opportunity to compare them 

 with any examples of the form described by Dr. Merriam. By the 

 kindness of my friend D. A. K. Fisher, Assistant Chief of the Bio- 

 logical Survey, who sent me a skin and skull of an old ram from the 

 Chuckawalla Mountains, killed in August, 1902, and referred to O. c. 

 nelsoni, I have been able to compare the two forms. In color this ram 

 is quite different from all of my thirteen specimens from the San Pedro 

 Martir Mountains, being very much darker, the animal being in the 

 "blue" coat, and is a dark brownish drab, with a very large and wide 

 caudal patch, and the legs are brownish in front, and not black or 

 blackish; in fact, more on the Ovis cervina style, while these parts in 

 San Pedro Martir examples are more on that of the Ovis stonii. I 

 regret very much that I am unable to make a comparison of the skulls 

 of the two large rams, but the one from the San Pedro Martir, at pres- 

 ent in my possession, is mounted, and has been loaned to me by Mr. 

 Dupee, of Chicago, who shot it, and the measurements of the head 

 given above are taken over the skin. The horns of the ram are longer 

 and heavier than those of the Chuckawalla Mountains specimen, and 

 stand out from the head more. The differences between the new race 

 and O. c. ndsoni may be summed up as follows: darker legs, more like 

 those of O. stonii, much smaller caudal patch grading so imperceptibly 

 into the color of the back as to leave no dividing line whatever; the 



