26 MERRIAM 



darker posteriorly ; rest of animal (including nose, cheek, feet and 

 tail) yellowish white with indistinct fulvous markings as follows: a 

 patch on each side posteriorly, one on pectoral region, reaching up on 

 sides of neck to ears, and a ring around (but not reaching) base of 

 tail ; a dark brownish median stripe reaching from middle of back to 

 ring around tail. 



Cranial characters. — Skull similar to that of unalasce7isis in gen- 

 eral form, form of zygoma and jugal, and in enamel pattern, but 

 smaller, and differing from all known species in the bullae, which are 

 very small and fiarrozv ; incisive foramina short; molars small and 

 rather narrow, but not quite so narrow as in richardso7ii. 



j\Ieasure?7ients. — Type specimen (measured from alcohol by 

 C. H. M.) : total length ii8; tail vertebrcE 13; hind foot 18. 



DICROSTONYX RICHARDSONI sp. nov. Churchill Lemming. 



Type from Fort Churchill, Hudson Bay. No. f yf f $ ad. Merriam 



Collection. July 1859. W. MacTavish. 



Characters. — Size large ; fur long and silky ; 3d nail of forefoot 

 much larger than 4th ; b2illce broadly rounded and somewhat de- 

 pressed. 



Colon. — Type specimen in winter pelage: silky white all over. 



Cranial characters. — Skull large ; zygomata very broad and squarely 

 spreading; rostrum and nasals long, frontals rather narrow inter- 

 orbitally; bullce depressed^ broadly and roundly inflated. Molar 

 series narrow; enamel pattern as in nelsoni and unalascensis (not as 

 in hudsonius'). 



This species resembles nelsoii but differs from all others in the 

 small size and narrowness of the molar teeth, and is distinguishable 

 at a glance from all known species by the broadly rounded and rather 

 depressed bulla;. 



Measurements. — Type specimen (measured from alcohol by C. H. 

 M.) : total length 143; tail vertebrie 14; hind foot 20. 



LEMMUS ALASCENSIS sp. nov. Point Barrow Lemming. 



Type from Point Barrow, Alaska. No. ||^^ 9 ad. Merriam Col- 

 lection. 



Characters. — Size medium (slightly smaller than either lonmus or 

 nigripes) ; ears smaller than in nigripes; feet and nose pale. 



Color. — Type specimen (in alcohol) from Point Barrow, and a 

 skin (alcoholic) from St. Michaels: entire animal golden fulvous, 

 darkest on head, where it is mixed with black hairs; brightest on sides, * 

 where it is almost orange fulvous; palest on feet and around mouth. 



