NO. 36 NEW MAMMALS FROM PANAMA GOLDMAN II 



Color. — Ground color of upper parts cinnamon-rufous, darkened 

 on top of head and along- median line of neck by slender bristles 

 which are replaced from near shoulders to rump by stout, anteriorly- 

 grooved, black-tipped spines projecting beyond and overlying the 

 finer hairs ; cheeks and outer sides of fore limbs grayish brown, the 

 cheeks in a fully adult example suffused with cinnamon-rufous ; outer 

 sides of hind limbs blackish ; under parts white, interrupted in some 

 specimens by a more or less complete pectoral band ; nose and sides 

 of muzzle blackish ; ankles dark all round ; inner side of metatarsus 

 and three inner digits whitish, outer side and two outer digits 

 brownish ; tail blackish above, whitish belov/. 



Skull. — General form resembling that of triiei, but jugal more 

 extended vertically, the inferior border more produced anteriorly, 

 reaching nearer to antorbital foramen, and more prolonged poster- 

 iorly to form a distinct hook. Similar to gyninurus, but parietals 

 more developed below temporal ridges ; squamosal reaching farther 

 along lateral ridges near frontoparietal suture ; audital bullae larger ; 

 zygomata differing in about the same characters as from tniei; 

 dentition the sam.e as in the type species of the genus. 



Measurements.— Type: Total length, 391 mm. ; tail vertebra:, 153 ; 

 hind foot, 54. An old male topotype : 529; 244; 62.5. Skull 

 (type) : Condylobasal length, 51.6; zygomatic breadth, ,29.2; inter- 

 orbital breadth, 13 ; palatal length, 20; length of palatal bridge, 11.8; 

 width of jugal near middle, 3.8 ; maxillary toothrow, 9.3. 



Remarks.— The Isthmian representative of this genus agrees 

 closely with truei and gymnurus in color and remarkably stout spiny 

 armature, but is readily distinguished by the cranial characters 

 pointed out. The posterior prolongation of the lovv'er border of 

 the jugal to form a process or hook is a character present also in 

 some species of Prcechimys, and absent in others. 

 Specimens examined.— Three, from the type locality. 



