254 FIBER. 



Color. Above dull yellowish brown, dorsal region darker; throat 

 yellowish white; cheeks yellowish fawn; middle of chin dusky; under 

 parts yellowish brown. 



Measurements. Total length, 539; tail vertebrae, 225; hind foot, 

 74. Skull: occipito-nasal, 56; zygomatic breadth, 38; interorbital 

 breadth, 6; length of nasals, 20; widest part of nasals, 9.5; length of 

 upper molar series, 13.5. 



615. Fiber spatulatus Osgood. 



Fiber spahdahis Osgood, N. Am. Faun., No. 19, 1900, p. 36. 



Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 1901, p. 214; 



Zool. Ser. 

 Northwest Territory Musk Rat. 



Type locality. Lake Marsh, Yukon, Canada. 



Geogr. Distr. Northwest Canada. Range unknown. 



616. Fiber occipitalis Elliot. 



Fiber occipitalis Elliot, Pub. Field Columb. Mus., iii, 1903, p. 162, 

 fig. Zool. Ser. 

 Oregon Musk Rat. 



Type locality. Florence, Oregon. 



Geogr. Distr. Known only from the type locality: 



Genl. Char. Largest species of the genus. Superior outline of 

 occipital bowed inward at parietal, nearly forming a half circle; 

 interorbital constriction greatly pronounced ; frontal crest marked ; 

 postorbital process pointing downward, acute; brain case narrow 

 posteriorly ; interparietal nearly as long as broad ; parietals pointed 

 anteriorlv, very narrow posteriorly; face of occipital broader in pro- 

 portion to its length than that of F. zibethicits; coronoid process of 

 mandible narrow, acute; condyle broad and heavy; molars smaller 

 than those of F. zibethicus ; incisors short, heavy. 



Color. Above reddish brown with black hairs mixed; top of 

 head, nose, and around eyes blackish; lips white; beneath rufous; 

 inner side of thighs and anal region white; hands and feet blackish 

 brown; tail black. 



Measurements. Total length, 597; tail vertebrae, 295; hind foot, 

 85; ear, 21. Skull: occipito-nasal length, 67; Hensel, 60; zygomatic 

 width, 43; interorbital constriction, 6.5; across postorbital processes, 

 23; length of nasals, 27; width of nasals posteriorly, 2.5; anteriorly, 

 8; greatest width of rostrum, 11 ; palatal length, 22. 



617. Fiber obscurus Bangs. 



Fiber obscurus Bangs, Proc. Biol. Soc. Wash., ix, 1S94, p. 133. 

 Elhot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 1901, p. 214. 

 Zool. Ser. 



