BANGS: CHIRIQUI MAMMALIA. or 
Zygodontomys cherriei (ALLEN). 
One youngish 9, Bogaba, July 3. 
I have compared this example with topotypes, kindly loaned by Dr. Allen, 
and can find no differences. The type locality of the species is Boruca, Costa 
Rica, in the low lands. 
The present specimen, not full grown, measures, total length, 195; tail ver- 
tebre, 75; hind foot, 23; ear, 13. 
Zygodontomys chrysomelas (ALLEN). 
_ Three specimens, Bogaba, July. 
It is possible that the Chiriqui form may prove to be suospecifically different 
from true Z. chrysomelas of Costa Rica (type locality Suerre). One specimen 
loaned by Dr. Allen from San Carlos, differs from the Bogaba examples in 
being smaller, with smaller skull, lighter rostrum, and broader palatal slits. 
Additional material, however, may show these differences to be individual. 
The Vesper rats, related to Z. chrysomelas, of which there are several in 
South America, form quite a distinct group in the genus Zygodontomys, dif- 
fering from the more typical members, in their very dark coloration, reddish 
bellies, nearly naked, dusky feet and hands, with white nails, and in their 
wider skulls — especially wide between the orbits — with strongly marked, over- 
hanging superciliary beading. 
Measurements (of the three Bogaba skins) — 
No. Sex. Total length. Tail vert. Hind foot. Ear. 
10,290 & old ad. 240 100 27 
10,291 9? ad. 230 90 28 
10,292 & yg. ad. 215. 90 27 14 
Reithrodontomys australis ALLen. 
Two specimens, adult g and 9, Boquete, 4,000 feet, April 30. 
These I have compared with the type of R. australis from Volcan de Irazu, 
Costa Rica, loaned by Dr. Allen. In color they exactly agree, except that the 
upper surface of the feet is darker, more grayish — the feet being whitish in 
the type. The skulls of the two Boquete specimens, are heavier throughout 
especially the rostral part, and in this character they are intermediate between 
true &. australis and the form described below from the summit of the Volcan 
de Chiriqui. 
Measurements (of the two Boquete skins) — 
No. Sex. Total length. Tail vert. Hind foot. Ear. 
10,282 Q ad. 165 85 18 14 
10,283 fd ad. 155 75 19 12 
