46 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
more overhanging, and not so S-shaped. From the large South American 
species (H. 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. longicaudatus Gray, 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 
x 13. very young, the whole upper parts being slaty. No. 
10,361 9, also 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. 
Fic. 27. Heteromys 
repens. ‘Type. 
Measurements — 
No. Sex. Total length. Tail vert. Hind foot. Far. 
10,359 & old ad. 300 155 33 15 
10,355 4 & old ad. 285 150 32 14 
10,358 1 & old ad. 285 .145 33 15 
10,3561 type 9 old ad. 282 150 33 15 
10,361 ? young 247 130 32 15 
10,360 ? young 235 115 30 12 
Skull, type, 2 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 nasals, 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. 
