258 SYNAPTOMYS. LEMMUS. 



626. Synaptomys dalli Mcrriam. 



Synaptomys dalli Merr., Proc. Biol. Soc. Wash., x, 1896, p. 62. 

 Elliot, Syn. N. Am. Mamm., F. C. M. Pub., n, 1901, p. 206. 

 Zool. Ser. 

 BALL'S LEMMING VOLE. 



Type locality. Nulato, Alaska. 



Geogr. Distr. Valley of the Yukon, western Alaska. Range 

 unknown. 



627. Synaptomys bullatus Preble. 



Synaptomys bnllatns Preble, Proc. Biol. Soc. Wash., xv, 1902, 



p. 181. 

 PREBLE'S LEMMING VOLE. 



Type locality. Trout Rock near Fort Rae, Great Slave Lake, 

 Mackenzie, Canada. 



Geogr. Distr. Unknown. 



Genl. Char. Skull similar to that of 5. dalli, but pelage less red- 

 dish; hind foot smaller. 



Color. Above black and reddish brown, black predominating; 

 sides lighter; beneath ashy plumbeous; feet dusky brown; tail above 

 dusky, beneath ashy. 



Measurements. Total length, 130; tail vertebrae, 24; hind foot, 

 18. Skull: occipito-nasal length, 26; zygomatic width, 16; inter- 

 orbital constriction, 3 ; length of upper molar series, 7. 



628. Synaptomys truii Mcrriam. 



Synaptomys tnici Merr., Proc. Biol. Soc. Wash., x, 1896, p. 62. 

 Klliot, Syn. N. Am. Mamm., F. C. M. Pub., n, 1901, p. 207. 

 Zool. Ser. 

 TRUE'S LEMMING VOLE. 



7 V/H- locality . Skagit Valley, northwestern Washington. 

 Geogr. Distr. Northwestern Washington. Range unknown. 



Genus 84. Lcmmiis. Lemming. 



Lemmus Link, Zool. Beyt. Xatur., i, Pt. 2, 171)5, P- 75- T>T C ' ^^ ns 



IciiiDins Linnaeus. 

 My>>ilcs Pallas, Zoog. Rosso-Asiat., I, 1811, p. 1 172. 



Rocherb., Actes Soc. Linn. Bordeaux, xn, 1841, No. 42, 

 i. 216. 



29. Lemmus trimucronatus (Richardson). 



A i trimucronatus Rich., J<urn. Parry's 2d Voy., 1825, 



Appeml.. ]>. 309 



