8 



Annals of the Carnegie Museum. 



orbital plate and the depth of the maxillaries being even less than, 

 those of the latter; the arrangement of the molar cusps is also similar 

 in both forms; on the other hand E. t. endorobcB widely differs from 

 the new genus in totally lacking its peculiar and characteristic 

 development of the orbital and frontal portions of the skull (see 

 Plate II, figs. 6-10, and the following Table of Ratios). 



Table of Ratios. 



Type 

 (No. II). 



Cotype 

 (No. 32). 



Dasymys ^ 

 sp. 



Epimys tiil- 



bergi endo- 



robcE? 



Ratio of anterior width to posterior 

 width of frontals 



Ratio of length of nasals to greatest 

 length of skull 



Ratio of maxillary depth at fronto- 

 maxillary suture to greatest 

 length of skull 



1.40 

 .46 



.22 



1. 10 



•44 



.24 



.8 7-. 79 

 .40-.38 



.27-. 27 



•50 

 .41 



Dentition. — Similar to that of Epimys in the proportions of the 

 molars and in the arrangement of their cusps. 



Pelage. — Of the same general character as that of some of the 

 sylvicoline species of Epimys, soft, exceedingly long and thick, the 

 color of upper and lower surfaces distinctly differentiated. 



I. Stenocephalemys albocaudata sp. nov. 



Type from Inyala Camp, Chilalo Mountains, southern Abyssinia, 

 collected February 18, 191 1. (Original field No. D. G. R. 11.) 



Characters. Skull. — Remarkable interorbital constriction of 

 frontal region, supra-orbital ridges approaching to within I mm., and 

 posterior position of narrowest point; squamosals largely supplanting 

 frontals in formation of brain case; excessive elongation of maxillary 

 nasal region; unconstricted base of suborbital foramina, and compara- 

 tive narrowness of spreading anterior orbital plates; markedly arched 

 superior profile of cranium. 



Dentition. — Incisors ungrooved, yellow anteriorly, upper pair re- 

 curved, lower procumbent; molars worn smooth (see No. 32 for cusps, 

 which are arranged in three longitudinal rows as in Epimys) ; combined 

 length of AP and AP slightly greater than AP. 



"^Dasymys 9, No. 162463 U. S. N. M. and No. 165237 U. S. N. M., the latter 

 specimen figured on Plate I, figs. 6-10. 



3 Epimys iulbergi endorobce Heller, 9 , No. 163402 U. S. N. M., figured on Plate 

 II, figs. 6-10. 



