i28 SCIUROPTERUS. MUS. 



Sub. Fam. II. Pteromyinae. 



51. Sciuropterus. 



141. a. Sciuropterus yukonensis. Osgood, N. Am, Faun., 1900, 

 No. 19, p. 25. 



Ty/e locality. Camp Davidson, Yukon River, near Alaska-Canada 

 boundarj'. 



Geogr. Distr. Possibh" from Chilkoot Inlet, Alaska, north to 

 Canada boundary. 



Genl. Char. Size large; tail long; color dark, base of face 

 bluish black. 



Color. Above pale cinnamon, beneath whitish suffused with 

 cinnamon fawn; sides of head ashy and cinnamon; orbital ring black; 

 tail, above fawn mixed with black. Feet, above dusky, beneath 

 buffy white. 



Measurftnents. Total length, 365; tail vertebrae, 180; hind 

 foot, 41. 



141. hb. Sciuropterus alpiniis (volans)lascivus. Bangs, Proc. N. 

 Eng. Zool. Soc, 1899, p. 6g. 



TyJ>e locality. Tallac, El Dorado County, California. 



Genl. Char. Similar to S. v. taliforniciis, but darker; nasals 

 longer, audital bullae larger. 



Color. Above cinnamon rust; beneath buffy white. Tail like 

 back, darkest at tip. Cheeks smoke gray. 



Measurements. " Total length, 300-320; tail vertebrae, 135-150; 

 hind foot, 37-43; ear, 25.5-27." (Bangs, 1. c.) 



Fam. I\'. ^Iiiridae. 



Sub. Fam. I. Murinae. 



44. Mus. 



149. Mus norwegicus. Erxleb. Syst. Reg. Anim., 1777, p. 38 1. 

 Rehn, Proc. Biol. Soc. Wash., 1900, p. 167. 

 Mus (lecumantis. Pall. Glir., 1778, p. 91. 



Mr. Rehn (1. c.) has shown that Erxleben gave the name of 

 norwegicus to this rat one year before it was called decumanus by 

 Pallas, and therefore the latter appellation will become a synonym. 



