NO. 2 NEW MAMMALS FROM EASTERN PANAMA GOLDMAN 9 



and in front of cars brown instead of -silvery gray; skull more 

 elongated, much narrower posteriorly and differing widely in detail. 



Color.- — Upper parts dull chocolate brown, becoming nearly pure 

 black in fresh pelage; under parts and inner sides of limbs nearly 

 naked, the scattered hairs a lighter brown, becoming grayish on lips 

 and near base of tail ; whiskers brown : feet and tail brownish, or 

 dark flesh color. 



Skull. — Size large, rather elongated, with anteriorly spreading 

 zygomata, narrow brain-case and narrow rostrum : similar to that < f 

 carat or, but less massive, more elongated, narrower posteriorly, 

 with lower lambdoid crest and narrower rostrum; premaxillse 

 extended posteriorly, leaving a wider space for the union of frontals 

 and maxillre between premaxillae and lachrymals ; upper surface 

 premaxillse more constricted near zygomata, the sides of rostrum 

 bulging below ; lambdoid crest low, nearly straight or slightly con- 

 vex posteriorly (not high and sinuous as in cavator and pansa i : 

 squamosals less expanded laterally as postglenoid shelves, the margin 

 deeply notched and exposing much of tubular portion of bulla when 

 viewed from above ; parietals and squamosals less upturned poste- 

 riorly ; mastoid process of squamosal and lateral wing of supraoccipi- 

 tal less expanded vertically ; maxillary and squamosal arms of 

 zygoma more widely separated by jugal (meeting or nearly meeting 

 along upper border of zygoma in cavator), third upper molar shorter, 

 the posterior heel less produced ; incisors narrower. 



Measurements. — Type: Total length, 401 mm.; tail vertebrae, 

 132; hind foot, 53.5. Average of three adult male topotypes : 367 

 (358-376); 129 (122-135); 51.5 (51-53)- Average of four adult 

 female topotypes: 364 (348-388); 121 ( 1 18-128) ; 49.0 (48-52.5). 

 Skull (type): Condylobasal length, 70.7; zygomatic breadth, 44.7: 

 nasals, 27.8 x 8.9; breadth of premaxillary constriction in front of 

 zygoma, 13; interorbital breadth, 10.9; breadth across postorbital 

 processes, 16.2; breadth across mastoid processes of squamosals, 

 39.3 ; breadth between postglenoid constrictions of squamosals, 28. 1 : 

 basion to summit of lambdoid crest, 18.2; alveolar length of maxil- 

 lary tooth row, 14.2. 



Remarks. — The pocket gopher of eastern Panama seem- to be 

 most like cavator of western Panama, but differs in numerous 

 characters from all its congeners. In the general elongation of the 

 skull and low, nearly straight lambdoid crest it is somewhat like 

 dolichocephalus, but the zygomata are divergent anteriorly, and the 

 skull is unlike all the Costa Rican species in the postglenoid con- 



