724 SIX NEW NOirrif AMi:inr.\\ ^rAM^r^l.s—MEAIiNS. 



Description. — Siiialler than Ercthizon cpi.rdntkits, with hirg^er external 

 and internal organs of hearing and a much paler and dnller coloration. 

 Dorsum covered with white (luills, which are narrowly pointed with 

 brown and mixed with \eiy long and rigid haii'S, many of which are 

 broadly tijjped or banded at base with whitish ; color darkest on middle 

 of ramp. Mu/zle, feet, and under surface of body, brown, with more j 

 or less admixture of gray-tipped hairs. j 



Two specimens (Xos. /y,;^ and niiMj, U.S.iST.M.) collected by Doctor j 

 C J>. Iv. Kennerly, on Bill Williams's Fork, an Arizona tributary of the 

 Colorado Ifiver, are in good winter coat, having been killed in Decern, 

 ber or January of the year iS^)'S or 1.S54, The long, coarse hair is yel- 

 lowish instead of grayish white, and the quills of the dorsal surface i 

 are concealed by dense, woolly underfur, which is abseut in the Fort [ 

 \Vhipi)le specimen, which appears to have been killed in summer. A 

 specimen collected by the writer in the ^logollon ^Mountains, Yavapai 

 County, Arizona (No. 2404, Collection of the American ^luseum of 

 Natural History, New York), agrees with the above except that it is 

 l)aler and grayer, having a dusty appearance. 



Cranial characters. — The skull shows the type specimen to liave been 

 nearly adult, the teeth being mature, although the cranial sutures are 

 quite evident and the osseous crests but slightly developed. Selecting 

 for comparison a specimen of similar age from northern California, 

 collected by Mr. Charles II. Townsend, the most striking difterence, j 

 aside from the much larger size of the California specimen — which 

 measures 08 mm. in total leugth against SO in the type of the subspecies 

 coiic.si — is the enormous development of the audital bulla in the Arizona 

 anima], in which it measures 21 by 16.7 mm. against 19 by 15 in the 

 Califoinian. Other skulls from Arizona and New Mexico bear out 

 these characters, though I am unable to detect any other cranial differ- 

 ences. None of the specimens examined were measured when fresh. 



