8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 



RHIPIDOMYS SCANDENS, new species 



Type from near head of Rio Limon (altitude 5,000 feet), Mount 

 Pirri, Eastern Panama. No. 178937, female old adult, U. S. 

 National Museum (Biological Survey Collection), collected by E. A. 

 Goldman, April 25, 1912. Original number 21640. 



General characters. — Similar to R. Venezuela:, but upper parts 

 darker colored ; under parts pure white as in Venezuela:; skull with 

 broad braincase and narrow frontal region. Somewhat like R. cocal- 

 ensis, but color less tawny, and skull differing especially in nar- 

 rower more depressed frontal region. 



Color. — Upper parts pale cinnamon rufous lined with black, be- 

 coming paler on the cheeks, shoulders and sides where the black- 

 tipped hairs are less numerous ; pelage of under parts, including 

 lips and inner sides of limbs, pure white to roots ; feet white except 

 the usual clouded metapodial areas ; tail brownish above and below, 

 scantily clothed with short hairs to near tip which is slightly tufted. 



Skull.— In general form closely resembling that of R. Venezuela:, 

 but braincase decidedly broader; inner sides of parietals longer; 

 frontal region narrower posteriorly as in R. Venezuela:. Compared 

 with the skull of R. cocalensis the braincase is similarly broad, but 

 the frontal region is depressed anteriorly and much narrower, especi- 

 ally posteriorly, the maxillary arm of the zygoma is heavier, and the 

 interparietal is larger. 



Measurements. — Type : Total length, 330 millimeters ; tail verte- 

 brae, 198; hind foot, 32. Skull (type) : Condylobasal length, 32.3; 

 zygomatic breadth, 19.2 ; interorbital breadth, 5.3 ; interparietal, 10.2 

 x 4.8 ; incisive foramina, 7.3 ; length of palatal bridge, 5 ; maxillary 

 toothrow, 5.7. 



Remarks. — This form is closely allied to R. Venezuela:, and the 

 two may intergrade, but until the various forms of this unrevised 

 group are better known it seems preferable to treat the Panama 

 representative of the genus as a distinct species. 



Specimens examined. — One, the type. 



HETEROMYS AUSTRALIS CONSCIUS, new subspecies 

 Type from Cana (altitude 2,000 feet), Eastern Panama. No. 



178699, male adult, U. S. National Museum (Biological Survey 



Collection), collected by E. A. Goldman, March 8, 1912. Original 



number 21468. 



General characters. — Closely allied to H. australis australis and 



H. a. lomitensis, but darker colored than the former and with the 



