258 SYNAPTOMYS. LEMMUS. 



626. Synaptomys dalli Merriam. 



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

 Elliot, Syn. N. Am. Mamm., F. C. M, Pub., 11, 1901, p. 206, 

 Zool. Ser. 

 Ball's Lemming Vole. 



Type locality. Nulato, Alaska. 



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

 unknown. 



627. Synaptomys bullatus Preble. 



Synaptomys bullatus 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 Merriam. 



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



Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 1901, p. 207. 



Zool. Ser. 

 True's Lemming Vole. 



Type locality. Skagit Valley, northwestern Washington. 

 Geogr. Distr. Northwestern Washington. Range unknown. 



Genus 84. Leiniiius. Leiiiiiiings. 



Lemmus Link, Zool. Beyt. Natur., i, Pt. 2, 1795, p. 75. Type Mus 



lemm,us Linnaeus. 

 Myodes Pallas, Zoog. Rosso-Asiat., i, 181 1, p. 172, 

 Lemntis Rocherb., Actes Soc. Linn. Bordeaux, xii, 1841, No. 42, 



p. 216. 



629. Lemmus trimucronatus (Richardson). 



Arvicola trimucro)iatus Rich., Journ. Parry's 2d Voy., 1825, 

 Append., p. 309. 



