NO. 36 NEW MAMMALS FROM PANAMA — GOLDMAN Q 



HETEROMYS PANAMENSIS, sp. nov. 



Type from Cerro Azul (altitude 2800 feet), near the headwaters 

 of the Chagres River, Panama. No. 171 107, male adult, U. S. 

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

 Goldman, March 23, 191 1. Original number 20999. 



General characters. — Allied to repens, but color still darker ; fore 

 feet blackish, instead of white, to near base of toes ; ankles dusky 

 all round ; an ochraceous buffy lateral line sometimes present ; sole 

 of hind foot naked, six-tuberculate. 



Color. — Ground color of upper parts blackish, nearly clear black 

 on lower part of rump and outer sides of hind legs, becoming slaty 

 grayish along fianks and outer sides of fore legs, the slender ochra- 

 ceous bufify hairs abundant and producing a grizzled effect ; ochra- 

 ceous bufif lateral line present in some specimens, absent in others ; 

 under parts white, sometimes suffused with pale buff; fore 'feet 

 slaty grayish to -near base of toes ; ankles and proximal third of 

 metatarsus dusky all round ; distal two-thirds of metatarsus, and 

 toes of fore and hind feet, whitish ; tail varying from blackish above 

 and whitish below to dark nearly unicolor all round. 



Skull. — Similar to that of repens. but rostrum broadening more 

 abruptly to zygomata ; interparietal broader ; lateral wings of supra- 

 occipital narrower, less developed over mastoids. 



Measurements. — Type : Total length, 283 mm. ; tail vertebrae, 148 ; 

 hind foot, 35. Skull (type) : Greatest length, 35.5 ; zygomatic 

 breadth, 17.1 ; interorbital breadth, 9.4; nasals, 14.4; width of brain- 

 case, 15.2; interparietal, 10 x 5.5; maxillary toothrow, 5.2. 



Remarks.— On the mountains near the headwaters of the Chagres 

 River this very dark spiny pocket mouse was found inhabiting the 

 forests from 2000 feet upward to the summit at about 3000 feet 

 altitude. The same species was also obtained at about 2000 feet 

 altitude on Cerro Brujo, near the north coast. It is more nearly 

 related to repens of Chiriqui, than to sonalis, a near geographic 

 neighbor of the lowlands in the Canal Zone. 



Specimens Examined.— ^i:^, all from Panama, as follows : Cerro 

 Azul (type locality), 5; Cerro Brujo, i. 



HETEROMYS ZONALIS, sp. nov. 



Type from Rio Indio (near Gatun), Canal Zone, Panama. No. 

 170976, female adult, U. S. National Museum (Biological Survey 

 Collection), collected by E. A. Goldman, February 15, 191 1. Origi- 

 nal number 20885. 



