MAMMALS 319 



3. Pit3miys McMurtrie. Like Microtus; cranium flat and wide; 

 plantar tubercles 5; mammae 4; fur short and dense; ears very small; 

 tail very short: 3 species, i in Mexico. 



P. pmetorum (LeConte). Pine mouse. Color bright russet brown; 

 belly dusky; ears concealed in the fur; length 113 mm.; tail 18 

 mm.; hind foot 15 mm.: Georgia and Mississippi to Indiana and New 

 York; common in fields and open woods. The pine mouse has an 

 underground nest and raises several litters of from i to 4 young a year; 

 the runways are also underground, and often resemble mole's tunnels; 

 the food consists of grasses, roots and bark, and great damage is often 

 done to orchards and gardens. 



Subspecies of P. pinetorum 



P. p. pinetorum (LeConte). Georgia and the Carolinas. 

 P. p. scalopsoides (Audubon & Bachman). Size larger; color darker: 

 North Carohna to New York; westward to Illinois. 



Fig. 171. — Lower jaw of Synaptomys cooperi {from Miller). 



P. p. auricularis Bailey. Colors dark and rich; ears large: Missis- 

 sippi to Indiana, between the Alleghany Mountains and the Mississippi 

 River. 



P. nemoralis (Bailey) . Color full chestnut; belly washed with bright 

 cinnamon; length 130 mm.; tail 24 mm.; hind foot 18 mm.: westward of 

 the Mississippi River from Arkansas to Iowa. 



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

 mammae 6; skull massive: i species. 



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

 tail 121 mm.; hind foot 14 mm.: eastern and central Florida; in marshes. 



5. S3maptomys 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. 



6*. cooperi Baird (Fig. 172). Body small and mouse-like, but with 

 a very much shorter tail than the house-mouse, grizzled gray in 

 color; length 120 mm.; tail 18 mm.; hind foot 18 mm.; head very 

 large: northern and central States and Canada; southward to North 



