430 NEOTOMA. PHENACOMYS. SYNAPTOMYS. 



Genl. Char. Similar to N. c. drummondi, but darker; beneath 

 pure white. Skull: sphenopalatine vacuities open; ventral surface 

 of occipital with a high trenchant median ridge; front of incisors 

 pale; nasals long, narrow. 



Color. Above grayish fawn and black, brighter on sides; under 

 parts and feet pure white; around eyes sooty; cheeks ashy; tail slate 

 above, white below. 



Measurements. Total length, 452; tail vertebrae, 192; hind 

 foot, 46. 



Sub. Fam. IV. Microtinae. 

 51. Phenacomys. 



236. a. Phenacomys celatus crassus. Bangs, Proc. New Eng. Zool. 

 Club, 1900, p. 39. 



Tyfe locality. Rigoulette, Hamilton Inlet, Labrador. 



Genl. Char. " Like true P. celatus, except very much larger, 

 with a similar, but bigger, skull." 



Color. "Upper parts rich cinnamon brown, much mixed along 

 back and on head with dark brown hairs; sides and usually region 

 behind ear paler — approaching wood brown; rump and flanks rather 

 more russet; snout, back and base of whiskers and eye clear cinna- 

 mon to cinnamon rufous; under parts grayish virhite; under fur slate 

 color; feet and hands grayish white; tail bicolor — whitish below, 

 brown above." 



Measurements. " Total length, 160; tail vertebrae, 37; hind foot, 

 20; ear, 15." (Bangs 1. c.) 



54. Synaptoinys. 



307. a. Synaptomys innuitus, medioxinus. Bangs, Proc. New Eng. 

 Zool. Club, 1900, p. 40. 



Type locality. Lance au Loup, Labrador. 



Genl. Char. "Larger than true .S. innuitus; skull larger in every 

 way except that it is proportionally flatter; rostrum less deflected; 

 visible portion of posterior end of frontals much larger; edge of the 

 maxillary portion of zygoma bounding the anteorbital foramen, much 

 more convex, so that the anteorbital foramen, viewed from the side, 

 is more rounded and larger; incisor teeth and molar teeth heavier 

 and the molar series longer." 



