176 MICROTIN^ 



than in >S. innuitus and S. wrangeli ; outer infold of W3 very deep, 

 almost clesing off an outer triangle; posterior loop of m^ small. 

 Upper incisors narrower and each with a shallower sulcus than 

 in other species. 



For e.xter)Hil and cranial measureineids of type, see table at 

 end of volume. 



Remarks. — No material in collection; the tyj^e is still the 

 only specimen that has been recorded. 



10. Synaptomys (Mictomys) innuitus True. 

 (Synonymy under subsjiecies.) 



Range. — Labrador. 



Characters. — In the absence of material it is not possible to 

 decide what are the specific characters distinguishing this animal 

 from ;S'. borealis, and I suspect that when all the known forms of 

 Mictomys are revised they will have to be treated as subspecies 

 of S. borealis. 



There are two well-marked forms of S. innuitus in Labrador 

 judging from the descriptions cited below, and to one of them 

 Preble's S. sphaynicola from New Hampshire is ajjparently very 

 closely related. 



10a. Synaptomys (Mictomys) innuitus innuitus True. 



1894. Mictomys innuitus True, Diagnoses of new N. Amer. Mamm., 



p. 3 ; Proc. U.S. Nat. Mus., 17, p. 242. 

 1896. Synaptomys (Mictomys) innuitus Merriam, Proc. Biol. Sec. 



Washington, 10, p. 61. 

 1912. Synaptomys (Mictomys) innuitus innnitus Miller, U.S. Nat. 



Mus., Bull. No. 79, p. 205. 



Type. — U.S. National Museum. 



Type locality. — Fort Chino, Ungava, Labrador. 



Characters. — Size small (hind-foot 17-5); tail short; general 

 appearance much as in S. cooperi, but outwardly distinguishable 

 by slightly longer ears. 



Colour (of alcoholic specimen) : Upj^er j^arts greyish-brown, 

 under surface grey; face pale brown; lips, end of nose, and 

 chin white ; feet pale brown ; tail bicoloured, jiale brown above, 

 white below. 



Skull very broad and flat; braincase strongly depressed; 

 zygomata broadly spreading and standing out squarely from 

 rostrum; auditory bullae strongly inflated anteriorly. Cheek- 

 teeth : m^ with broad posterior loop ; m^ and m^ with moderately 

 deep outer infolds. 



For external and cranial measvrements of type, see tables at 

 end of volume. 



Remarks. — No material examined ; the above account em- 

 bodies the essential part of the description given by Dr. Merriam 

 in his revision of 1896. 



