28 



BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



Skull type, ^ adult, basal length, 35.4; occipitonasal length, 40.2 ; zygomatic 

 width, 19.6; mastoid width, 15; length of nasals, 17.8; width of nasals, 4.8; 

 length of palatal slits, 7.4 ; width of palatal slits, 3.4 ; length of palate, to 

 palatal notch, 17 ; to end of pterygoid, 24.4; length of upper molar series 

 5.6 ; length of single half of mandible, 21.8. 



5. X 1| 



6. X 1| 



7. X IS 

 Figs. 5, 6, and 7. Megadontomys fiavidus. Type. 



Remarks. — The Volcan de Chiriqui is thus far the southernmost point from 

 which a species of this well-marked group of Vesper Eats has been recorded. 

 Megadontomys flavidus was common in the upland forest from 3,000 to 5,000 



