1914.] 



EEITHKODOITTOMYS TEXUIEOSTBIS GKOUP. 



79 



parts Prout's brown, faintly tinged with ocliraceous; underparts 

 white. 



STcuU. — Slightly smaller than that of tenuirostris, with flatter brain- 

 case and more inflated bullss; palatal foramina longer and slightly 

 broader, extending behind plane of first molars. 



Measurements. — Adult female: Total length, 196; tail vertebrae, 112 

 hmd foot, 22.5. Skull: (See table, p. 81). 



RemavTcs. — This subspecies lives at about the same altitude ' as 

 does tenuirostris and only a short distance away. With the very 

 limited amount of material at hand, it is impossible to say whether 

 the characters distinguishing the two forms will prove to be constant. 



S'pecimens examined. — Two, from type locality. 



REITHKODONTOMYS CREPER Bangs. 

 Chibiqui Harvest Mouse. 

 Reithrodontomys creper Bangs, Bull. Mus. Comp. ZooL, XXXIX, 1902, p. 39. 



Type locality, — Volcan de Chiriqui, Panama (altitude, 11,000 feet). 



Distribution. — KnoT\Ti only from the type locahty. 



Characters. — Size large; colors very dark (similar to R. a. australis 

 above, but darker beneath) ; skull similar to that of R. t. tenuirostris, 

 but smaller. 



Color. ^ — Type: Upperparts mummy-brown, varying on sides to 

 Mars brown; sides of face blackish; underparts russet; ears dark 

 sepia; tail dusky — almost clove-brown — aU around, except terminal 

 fourth which is whitish; feet whitish, palest on toes. 



/SZ^uZZ.— Similar in shape to that of R. t. tenuirostris, but smaller; 

 braincase narrowed posteriorly; palatal foramina expanded in the 

 middle, narrowing anteriorly; zygomata much contracted anteriorly. 

 Compared with R. t. aureus: Skull shghtly shorter and much nar- 

 rower; bullge smaller. 



Measurements. — Type ($ ad.): Total length, 215; tail vertebrge, 

 130; hind foot, 23. Skull: (See table, p. 81). 



Remarlcs.— This very distinct species is known only from a suigle 

 specimen, caught on the cold barren summit of the Volcan de 

 Chiriqui".^ It seems to be nearest related to R. tenuirostris, from 

 Guatemala. 



Specimen examined, — One, the type.^ 



1 Comparisons with Eidgway's *' Nomenclature of Colors " (1886). 



2 Bangs, loc. cit. 



2 Collection Mxis. Comp. Zool, 



