1893-] Allen and Chapman on Trinidad Mammals. 223 



This species is based on three specimens, an adult female and 

 two young males one-fourth to one-half grown. The adult speci- 

 men and the larger of the two young ones are unfortunately 

 tailless, the entire tail having been lost apparently in early life, 

 as happens often with the Trinidad species of Echimys, as noted 

 below. The young specimen with a perfect tail shows that this 

 member is relatively of about the same length as in Z. guiance. 



This species differs from L. guiana, apparently its nearest ally, 

 in the general coloration being much brighter and stronger, the 

 dorsal surface being orange-rufous heavily lined with black 

 instead of pale yellow or yellowish gray rather sparingly lined 

 with black, while the ventral surface is many shades darker. 

 The cranial differences consist in the slightly narrower and 

 shorter anterior palatine foramen ; in the slenderer, narrower 

 and posteriorly more extended nasals ; in the palatal emargina- 

 tion being bluntly oval instead of sharply V-shaped ; in the 

 greater breadth of the basi-occipital ; and in the greater slender- 

 ness of the ascending maxillary branch of the zygoma. 



It is probable that the baits used in trapping were not attractive 

 to this species. The two young specimens were trapped, but the 

 only adult secured was caught by dogs near the banks of a small 

 stream. It was called by the natives, Agouti Rat. 



24. Echimys trinitatis, sp. nov. 



Similar in size and proportions, and apparently in color, to E. cayennensis 

 but in cranial characters and in the distribution of the spines more nearly 

 resembling E. semispinosus Tomes. 



Adult. General color above rusty brown, nearly uniform except over a 

 rather broad median dorsal area, where the rusty brown is profusely mixed with 

 black, in some specimens the black prevailing ; whole ventral surface pure 

 white to the base of the hairs, except that occasional specimens show traces of 

 a prepectoral dusky color. Ears narrow, rounded at top, slightly hollowed on 

 the posterior border, nearly naked, flesh-colored, broadly margined with dusky. 

 Tail a little shorter than the head and body, well furred for about an inch at the 

 base, the rest practically naked, the annulations scarcely at all concealed by the 

 very short, much scattered whitish hairs, and there is no tendency to a terminal 

 pencil, as in E. cayennensis. Palms and soles naked, the latter uniform 

 blackish, the former usually mottled flesh-color and dusky, sometimes one color 

 prevailing and sometimes the other. Upper surface of fore feet grayish brown, 

 becoming lighter on the toes ; upper surface of hind feet dusky brown on the 



