1899-] Allen, New Rodents from Colombia and Venezuela. 199 



Skull (of type), total length, 60 ; basal length, 47 ; zygomatic width, 27 ; 

 mastoid width, 21 ; interorbital width, 13 ; length of nasals, 23 ; width of 

 nasals at middle, 6.3 ; crown length of upper toothrow, 8.5 ; palatal length, 

 8.5 ; length of lower toothrow, 9.2. 



This species is based on 102 specimens, of which 87 were taken 

 at Minca and 15 at Bonda ; the series includes quite a number of 

 young of various ages, ranging from those in first pelage to young 

 adults. 



Echimys minca belongs to the same group as E. trinitatis, hav- 

 ing the same pure white belly, the same general proportions, and 

 practically the same dentition. It is, however, very much smaller 

 and very different in coloration, being golden brown above 

 instead of dark chestnut brown. 



Echimys urichi, sp. nov. 



Type, No. 14798, $ ad., Quebrada Secca, Venezuela, Nov. 23, i8g8 ; F. W. 

 Urich. 



Similar in color and proportions to E. trinitatis, but much smaller. 



Measurements. Type, total length, 370 mm. ; tail vertebrae, 171; hind foot, 

 43, with claws, 46; ear, 25. Ten adult males measure as follows: total 

 length, 390 (344-409); tail vertebrae, 162 (140-186); hind foot, 44 (42-46); 

 ear, 25 (24-27). Two adult females average slightly less. 



Sktill, type, total length, 48 ; basal length, 33 ; zygomatic width, 23 ; mas- 

 toid width, 20 ; interorbital width, 10.3 ; length of nasals, 16 ; width of nasals 

 at middle, 4.5 ; crown length of upper toothrow, 8 ; palatal length, 8 ; length of 

 lower toothrow, 8.6. 



Named in honor of Mr. F. W. Urich, so well known through his natural 

 history work in Venezuela and Trinidad. 



This is an almost exact miniature of E. trinitatis, but the differ- 

 ence in size is so great that the separation seems unquestionably 

 necessary, E. urichi being nearly one third smaller than E. trini- 

 tatis. The comparative measurements of E. trinitatis, E. mincce, 

 and E. urichi are shown in the following table, based on adult 

 male' specimens, from which it appears that the largest specimens 

 of E. urichi do not very closely approach even the smallest 

 specimens of E. trinitatis. 



