ERETHIZON. 333 



Geogr. Distr. State of Sonora, Mexico, into New Mexico, east- 

 ward to Missouri, west to the Pacific and north to Alaska and the 

 limit of trees. 



((. Ert'ihi~ini rf>i.\-(nitJn(7u coitesi Mearns. 



Erethizon epixanthits couesi Mearns, Proc. U. S. Nat. Mus., 1897, 

 p. 723. Elliot, Syn. N. Am. Mamm., F. C. M. Pub., n, igoi, 

 p. 265. Zool. Ser. 

 COUES' TREE PORCUPINE. 



Type locality. Fort Whipple, Yavapai County, Arizona. 

 Geogr. Distr. Arizona and New Mexico. 



l>. Ert'tldzon epixanthum imjops Merriam. 



Erethizon epixanthus my ops Merr., Proc. Wash. Acad. Scien., n, 



1900, p. 27. Elliot, Syn. N. Am. Mamm., F. C. M. Pub., n, 



1901, p. 266. Zool. Ser. 

 ALASKA PORCUPINE. 



Type locality. Portage Bay, Alaska Peninsula, Alaska. 

 Geogr. Distr. Range unknown. 



c. E'i't'i ///-/>// 1'fii.VftnfJiunt ///o'/Y',svv'/?s Allen. 



Erethizon epixanthus! nigrescens Allen, Bull. Am. Mus. Nat. Hist. 



N. V., 1903, p. 558. 

 DUSKY PORCUPINE. 



Type locality. Shesley River, British Columbia, Canada. 



Genl. Char. Skull markedly depressed at fronto-parietal region; 

 lateral border of interorbital region forming a high obtuse knob. 



Color. Front and sides of head, black, lightest on the nape; 

 sides of lower back and thighs with tips of hairs yellowish; under- 

 parts sooty black; long -hairs on top of head and nape broadly tipped 

 with pale yellow; on shoulders and lower back the long hairs are 

 mostly black ; long hairs on thighs and sides of tail broadly tipped 

 with yellowish white; spines white tipped with black except on the 

 shoulders where they are plumbeous at tips. 



Measurements. Total length, 740; tail vertebrae, 210; hind foot, 

 90; ear, 27. Skull /total length, 105; basal length, 99; zygomatic 

 breadth, 67; mastoid breadth, 42; upper molar series, 26. 



834. Erethizon dorsatum (Linnaeus). 



Hystrix dorsata Linn., Syst. Nat., i, 1758, p. 57; i, 1766, p. 76. 

 Hystrix pilosus Richards., Faun. Bor. Amer., Mamm., i, 1829, p. 



214. (nee Peale.) 



Hystrix hudsoniits De Kay, N. Y. Zool., i, 1842, p. 27, pi. xxv, fig. 

 i, pi. vin, 2, a. b. c. 



