MAMMALS 



311 



4. Neofiber True. Size very large; tail long; plantar tubercles 5; 

 mammae 6; skull massive: i species. 



iV. alleni True. Color dark brown ; belly pale buff; length 320 mm. ; 

 tail 121 mm.; hind foot 40 mm.: Florida; in marshes and bogs. 



5. Synaptomys Baird. Lemmings. Each upper incisor with a 

 longitudinal groove in its outer surface; lower incisors extend back along 

 the inner side of the molars (Fig. 171), which are without roots; tail very 

 short, covered with short hairs: about 4 species in the United States. 



5. coo peri Baird (Fig. 172). Body small and mouse-like, but with 

 a very much shorter tailthan the house-mouse, grizzled 

 gray in color; length 120 mm.; tail 18 mm.; hind foot 

 18 mm.; plantar tubercles 6; head very large: northern 

 and central States and Canada; in woody marshes and 

 swamps; Boreal and Transition zones. 



Subspecies of S. coo peri 



S. c. coo peri Baird. Minnesota to the Atlantic; 

 south through New York and Michigan. 



5. c. helaletes Merriam. With larger head and feet, 

 and longer tail: length 130 mm.; tail 21 mm.; hind foot 

 20 mm.: Dismal Swamp in Virginia and North 

 Carolina. 



5. c. stonei Rhoads. Like the above, but smaller: 

 central Wisconsin and Illinois to the Atlantic; Massa- 

 chusetts to North Carolina. 



S. c. gossii (Coues). Like S. c. helaletes, but 

 redder: northeastern Arkansas and southern Illinois 

 into Iowa and Dakota. 



5. sphagnicola Preble. Color sepia brown mixed 

 with black; under parts grayish white; length 132 mm.; 

 tail 17 mm.; hind foot 17 mm 

 New Hampshire. 



6. Phenacomys Merriam. Similar to Microtus; molars with 2 roots 

 (Fig. 169) and large and strong; front teeth without grooves; body 

 short and thick; tail short; ears just appearing above the fur: 14 species 

 and subspecies, in Canada and the western mountains of the United 

 States. 



F. inter medius ]\Ierriam. Color yellowish brown, whitish below; 

 length 142 mm.; tail 30 mm.; hind foot 17 mm.: western States and 

 Canada, in the mountains. 



Fig. 172. — Sy- 

 naptomys cooperi 



Mount Washington, ^«^^^ ^^°'"= ^ 



