28 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. X. 



and in specimens in slightly worn pelage is scarcely distinguishable 

 from the grizzled central part of the tail, especially when viewed from 

 the under side. General color of upperparts mixed "peppery," 

 clay color and blackish ; orbital ring and sides of nose clay color to 

 ochraceous; chest and belly clear ochraceous rufous; upper side of 

 tail from a point about 50 mm. from its base to the black of the tip 

 mostly clear ochraceous instead of hazel or ferruginous as in chap- 

 mani; tip of tail black with few ochraceous hairs intermixed and a 

 few of the black hairs faintly tipped with ochraceous. Skull practi- 

 cally as in chapmani. 



Measurements. Type (dry skin): Total length 330; head and 

 body 165 ; tail vertebrae 165 ; hind foot (c. u.) 45. 



Remarks. The heavy black tip of the tail is the principal character 

 distinguishing this form from 5. chapmani. A complete revision 

 of this group of squirrels with ample material is necessary before it 

 will be possible to decide how many of the various described forms 

 should be regarded as species and how many as subspecies. 



Dasyprocta variegala colombiana Bangs. 



One specimen, Orope, Zulia, Venezuela; collected by N. Dear- 

 born. Comparison of this and other specimens of the same form 

 with those belonging to allied forms from Panama to Peru shows 

 sufficiently complete intergradation to convince that at least colom- 

 biana and isthmica should be regarded as subspecies of variegata. 



Hydrochoerus capybara Linnaeus. 



One specimen (skull only), Lake Valencia, Venezuela; collected 

 by N. Dearborn. 



Sylvilagus cumanicus Thomas. 



One specimen, Maracay, Venezuela; collected by J. F. Ferry. 

 This is by no means typical, being considerably larger and more 

 rufescent than the type of cumanicus. It is also decidedly larger than 

 5. orinoci but agrees closely with that species in color. Its external 

 resemblance to the insular form margarita also is marked. Without 

 a series of typical cumanicus, however, it does not seem safe to sepa- 

 rate it from that species. Possibly it should be regarded as inter- 

 mediate between orinoci and superciliaris , since it agrees in color with 

 one and in size with the other. 



Sylvilagus nigronuchalis (Hartert). 



Three specimens, Aruba Island, collected by J. F. Ferry; one 

 specimen, Curacao, collected by N. Dearborn. The single adult 



