238 Frerp Musrum or Natura History — Zodétocy, Vor. XI. 
Specimens examined from Wisconsin and adjoining states: 
Wisconsin — Solon Springs, Douglas Co., 1; Sayner, Vilas Co., 1; 
Lac Vieux Desert, Vilas Co., 1; Conover, Vilas Co., 3 = 6. by 
Minnesota — (N. M.) Elk River, 1; not typical but approaching fatuus. 
Michigan — (B. S.) Ann Arbor, 2; intermediate between fatwus and 
coo pert. 
KEEWATIN « s ph 
Ws 
6 
MANITOBA 
palma 
CO Ce RY Area of intergradation 
4 
NAAAANANS J Lec. #)  @)S.«. helatetes 
OKLA. 6 TENN. J © Specimens examined 
ARK. g s. C. O Records. 
Map illustrating the supposed distribution of Lemming Mice belonging to the subgenus Synap- 
tomys, which occur in eastern United States. The map is provisional, as the ranges of the various 
forms have not been determined. No attempt has been made to include all records east of Indiana 
and Michigan. a 
Synaptomys cooperi BAIRD. (Mammals N. Amer., 1857, p. 558.) Type locality —. 
Unknown; supposed to be New Jersey. Color, sepia to tawny brown (more or 
less variable) mixed with scattered black hairs on back; hairs on under parts 
plumbeous, with whitish tips; mamme 6. Total length, about 4.75 in. 
(120 mm.); tail vertebree, .70 in. (17.5 mm.); hind foot, .72 in. (18 mm.). 
Synaptomys c. fatuus BANGs. Type locality — Lake Edward, Quebec, Canada. 
Similar to cooperi, but averaging smaller and somewhat darker than cooperi; 
skull smaller and upper incisors shorter and narrower. Occurs in northern 
Wisconsin and northward. 
Synaptomys c. gossit (MERRIAM). Type locality — Neosho Falls, Woodson Co., 
Kansas. Size averaging larger than cooperi and color more reddish brown; 
skull larger and rostrum narrower; smaller audital bulla. The brain case 
in adult specimens is both actually and relatively longer than cooperi. 
Synaptomys c. helaletes (MERRIAM). (Proc. Biol. Soc. Wash., X, 1896, p. 59) 
Type locality — Dismal Swamp, Norfolk Co., Virginia. Similar to coopert, 
but skull somewhat longer and heavier; tail shorter and feet larger. ‘‘Similar 
to S. cooperi, but with larger head and feet, longer tail, much broader rostrum 
and mandible, and larger and more massive skull and teeth” (Merriam). 
