24 MERRIAM 



ATcasurcrueftts. — Type, J' ad. : total length 17S ; tail vertebrae 32 ; 

 hind foot 24. Average of 5 females from type locality : total length 

 166; tail vertebrae 26.5 ; hind foot 23.5. Skull of type: basal length 

 31.5; zygomatic breadth 19; mastoid breadth 14; nasals 9.S; molar 

 series y.3. 



MICROTUS MACFARLANI sp. nov. MacFarlane Vole. 



Type from Fort Anderson, north of Great Bear Lake, Arctic America. 



No. -jVjtV ^^- U- S- National Museum. R. MacFarlane. Orig. 



no. 3179. 



Characters. — Size medium or rather large; tail short. Similar 

 externally to operariushwt (apparently) larger; tail decidedly shorter; 

 skull larger; molars small. 



Color. — Upperparts uniform dull fulvous brown mixed with black 

 hairs ; underparts whitish, washed with buffy ; hind foot brown with 

 more or less whitish on toes; tail sharply bicolor, dusky above, soiled 

 whitish below. 



Cranial c/iaracfcrs. — Skull similar to that of opcraritis but brain- 

 case broader; zygomata with outer sides longer and parallel (not 

 broadest in middle); bullae much more fully and roundly inflated ; 

 nasals shorter ; mandible decidedly larger; incisors decidedly thicker 

 (anteroposterior ly) ; molar series slightly if at all longer. Compared 

 with yakutatoK^is the skull is shorter, flatter, and somewhat smaller ; 

 with molars decidedly smaller. 



]\Ieasi(rc>nc)its. — No measurements of fresh specimens are available. 

 In the dry skin of the type the hind foot measures 1S.5 and the tail 

 approximately 32. 



EVOTOMYS ORCA sp. nov. Orca Evotomys. 



Type from Orca, Prince William vSound, Alaska. No. 9S028 9 ad. 



U. S. National Museum, Biological Survey Collection. June 28, 



1899. A. K. Fisher. Orig. no. 2139. 



Characters. — Size medium; coloration dark ; feet and tail dufeky. 



Color. — Dorsal area dark chestnut or hazel ; sides yellowish or 

 buffy drab, intimately mixed with black hairs and darkest on rump ; 

 face very dark, grizzled with buffy-gray and black; underparts deep 

 buffy or buffy ochraceous, the plumbeous underfur showing through ; 

 hind feet dusky; tail above dusky from base to tip, below buffy. 



Cranial characters. — Skull similar to that of dawsoni (with large 

 subquadrate braincase and strongly developed postorbital crest of 

 squamosal) but with decidedly smaller bulla; and decidedly larger in- 

 cisors, particularly the upper ones. The underjaw is thicker and the 

 angular process less flaring. 



