XO. 2 NEW MAMMALS FROM EASTERN PANAMA — GOLDMAN 



tion between upper and under parts ; under parts, including' lips and 

 under sides of forearms, white, the fur pure white to roots on throat, 

 becoming somewhat duller and faintly plumbeous basally on hell}'; 

 forearms brownish above near wrists, and ochraceous butty along 

 outer sides: inner sides of hind legs pale buffy; nose and orbital 

 rings dusky ; feet white : tail dark brown above, lighter below to near 

 tip which is dark all round. Young (half-grown) : Similar to 

 adults, but darker, less rufescent. 



Skull. — Larger than that of pusilhts; brain-case bulging posteriorly 

 well behind plane of occipital condyles; temporal ridges extending 

 pi steriorly along lateral margins of parietals to supraoccipital ; nasals 

 reaching posteriorly beyond premaxillse. 



Measurements. — Type: Total length, 159 mm.; tail vertebra?, 

 83; hind foot, 21.5. Average of three adult topotypes : 160 I 158- 

 163) ; 84 (83-87) : 20.8 (20.5-21). Skull (average of four adult.-. 

 including type): Greatest length. 21.4 (21.3-21.5) ; condylobasal 

 length, 18.6 (18.2-19) ; zygomatic breadth, 11. 2 (11.2-II.3) : nasals, 

 8.6 (8.3-9) > interorbital breadth, 4.4 (4.3-4.7) ; interparietal, 8.3 x 

 2.2 (8.2 x 2.3-8.5 x 2.2) ; incisive foramina, 3 (3-3.2) ; length of 

 palatal bridge, 3.8 (3.7 x 4) ; maxillary tooth row, z.y (2. 7-2. Si. 



Remarks. — This handsome little spinv mouse seems to require 

 comparison only with pusillus. The adults present remarkably 

 slight variation in size or color. A half-grown young individual is 

 in a comparatively soft pelage corresponding to the immature coat 

 seen in Heteromys and other genera. 



Specimens examined. — Five, four adults and one young, all from 

 1.800-2.000 feet altitude at the type locality. 



RHEOMYS RAPTOR, sp. nov. 



Type from near head of Rio Limon (altitude 4,500 feet). Mount 

 Pirri, eastern Panama. No. 179028, male adidt. U. S. National 

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

 man, April 28, 1912. Original number 21658. 



General characters. — Size small; color dark; fur short and glossy, 

 the longer hairs of back about 9 mm. in length ; probably most like 

 tnehotis. but still smaller, with darker upper parts, and without 

 white markings on under parts or tip of tail. 



Color. — Upper parts from nose to base of tail mixed black and 

 cinnamon, producing a finely grizzled effect, the black predominating 

 e>pecially on head and rump; sides paler and somewhat grayer; 

 entire under part> varying from pale smoky gray to pale mouse gray. 



