SYNAPTOMYS 175 



?»' with a large posterior loop, about two-tliirds the size of the 

 middle loop. 



For extei-iuil ami cranial measurements, see tables at end of 

 volume. 



8. Synaptomys (Mictomys) chapmani Allen. 

 1903. Synaptomys (Mictomys) chapmani Allen, Bull. Amer. Mus. 

 N.H., 19, p. 555. 



Ti/pe. — American Museum N.H. ; adult male, collected July 

 1901.' 



Type locality. — -Glacier, Selkirk Range, British Columbia. 



Characters. — A short-tailed, large-eared species of greyish- 

 brown general colour; hind-foot 20 mm. 



Upper parts greyish-brown, with a slight suffusion of buff 

 which is strongest on the front of the head, the whole region in 

 front of the eyes being conspicuously washed with buff; under 

 surface dark grey, the j^lumbeous underfur very slightly tipped 

 with whitish, not sharply defined laterally. Ears large, prominent 

 above fur, coloured like the surrounding pelage. Feet dusky 

 greyish-brown. Tail very short, darker above than below, 

 well pencilled. Flank-glands in front of hijxs, covered by con- 

 spicuously lighter, almost whitish fur. 



Skull much larger than that of S. andersoni, narrower, with 

 relatively narrower braincase and more elongated rostrum ; 

 anterior palatal foramina longer and narrower ; auditory bullae 

 much smaller and less inflated. Cheek-teeth as in *S'. andersoni ; 

 j«3 with deej) re-entrant outer fold ; m^ with large posterior 

 loop. 



For external and cranial measurements, see tables at end of 

 volume. 



Remarks. — No material examined. 



9. Synaptomys (Mictomys) truei Merriam. 



1896. Synaptomys (Mictomys) truei Merriam, Proc. Biol. Soc. Wash- 

 ington, 10, p. 62. 



Type. — U.S. National Museum; subadult. 



Type locality. — Skagit Valley, north-western Washington. 



Range. — Known only from the type locality. 



Characters. — CTcnerally resembling *S'. irrangeli in outward 

 ajipearance and size; distinguished by its slightly longer ears, 

 more reddish-brown colour and the form of m^. 



Upper parts dull umber brown, fading gradually to plumbeous 

 of under parts ; belly hairs tipped with whitish. Tail bicoloured, 

 dark above, whitish below. Type and only known specimen 

 in moult and in very poor condition, hence the colours may not 

 be as in the normal animal. 



Skull characters unknown. Cheek-teeth with enamel loops 

 both above and below much fuller and more bluntly rounded 



