44 



bulletin: museum of compaeative zoology. 



Skull, type, No. 10,381, ^ old ad. (not quite so large as some of the very- 

 old specimens) basal length, 64 ; occipitonasal length, 67.8; zygomatic width, 

 45.8; mastoid width, 33.4 ; interorbital width, 11 ; length of nasals, 28; length 

 of palate to palatal notch, 44.6; upper molar series, 15.4; length of single half 

 of mandible, 51.2. 



Old adult 9 ) topotype. No. 10,389, basal length, 61.4; occipitonasal length, 

 63.4 ; zygomatic width, 40 ; mastoid width, 32 ; interorbital width, 10 ; 

 length of nasals, 25.4; length of palate to palatal notch, 41.4; upper molar 

 series, 15 ; length of single half of mandible, 48. 



Remarks. — This very distinct new species, was abundant on the slopes of 

 the volcano from 4,000 to 7,000 feet, but was not seen below 4,000 feet. It 

 hardly needs comparison with any of the four previously known species from 

 Costa Kica. 



Macrogeomys pansa,^ sp. nov. 



Type. — Mas. Comp. Zool., No. 10,364, old ad. 9 , Bogaba, July 6, 1901. 



Eight specimens, both sexes, Bogaba, July. 



Characters. — Much smaller than the alpine, M. cavator ; hind foot propor- 



FiG. 26. Macrogeomys pansa. Type, old 9- X li- 



tionally much larger (actually nearly the same size) ; colors duller and browner, 

 more grayish white on belly ; pelage short, close, very sparse on under parts, 



1 Pansa, broad-footed. 



