46 



BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



more overhanging, and not so S-shaped. From the large South American 

 species (//. anomalus Thompson, H. melanoleucus Gray, and H. Jesupi Allen) 

 it can be separated by its shorter, wider skull, — much wider between 

 orbits, and lighter rostrum. 



H. longicaudalus G-ray, from " Mexico," I do not 

 know, and the description is wholly inadequate. Dr. 

 Thomas says it belongs to this group. Possibly it 

 may be somewhat like the present species, though 

 if from Mexico this is improbable. 



Color. — Upper parts, — top of nose and face to 

 eyes grayish dusky; shoulders and sides finely mixed, 

 dark, dusky, brown, and tawny ochraceous ; median 

 parts of rump and lower back darker, more dusky ; 

 no yellowish or fulvous line along lower sides ; under 

 parts, including upper lip, under side of nose, inner 

 side of legs, and under side of arms, pure white ; outer 

 surface of legs dusky ; upper surface of arms gray ; 

 feet and hands white ; ears dusky, sparsely haired, 

 with a slightly perceptible whitish border; tail thinly 

 clothed with short, stiff hairs, dusky above, white 

 below, and with a slight whitish pencil. 



No. 10,360, young 9 , is in the slaty pelage of the 



very young, the whole upper parts being slaty. No. 



10,361 9) ^Iso young, has in the middle of the back 



a large sized patch of hairs colored like those of the 



adult, the rest of the upper parts being slaty. 



In No. 10,358 there are a good many wholly white spines scattered through 



the upper surface, and in the other three adults a very few of these white points 



can be seen. 



Fig. 27. Heteromys 

 repens. Type. 



Skull, type, 9 old adult, basal length, 31.4; occipitonasal length, 35.4; 

 zygomatic width, 16.4; mastoid width, 14.8; interorbital width, 9.2; length of 

 nasals, 14.8; width of na.sals, 4.2; upper molar series, 4.8 ; length of single 

 half of mandible, 17.2. 



Remarks. — From Peters's careful description and plate it is perfectly clear 

 that the Chiriqui Heteromys is distinct from H. adspersus. It is also clear 



1 All with worn teeth. 



