neio Forms of Saimiri, Oryzomys, ct'C. 249 



190], and presented by Mr. Bernard Hunt. Twelve specimens 

 examined from Caylloma {Hunt and Simons) and live from 

 Titiri {J. Kalinowski). 



An examination of the series ol Fhyllotis hoUvlensis obtained 

 by the late Mr. P. O. Simons at Potosi shows that tliese agree 

 precisely with the type; and as Mr. Bridges is known to have 

 collected at Potosi, that place may very well be considered as the 

 typical locality. Other similar specimens were collected by 

 Mr. Simons at Livichuco in the same region. 



But the skins obtained by JMessrs. Kalinowski, Hunt, and 

 Simons in the Peruvian part of the plateau, at Caylloma and 

 Titiri, are all noticeably more strongly suffused with yellow, 

 the ears more yellow (especially internally), the shoulders and 

 sides more yellow, the yellow patches on the metatarsals, 

 often imperceptible in true boliviensis, always strongly marked, 

 and the underside of the tail^ white throughout and contrasted 

 with the buffy or brownish upperside in holiviensis, is in 

 flavidior either wholly or partly dull yellowish, and is often 

 but little lighter than the upperside. 



Coendou mexicanus yucatanice^ subsp. n. 



General external characters as in true G. mexicanus of S. 

 Mexico and Guatemala, except that the long black fur of the 

 body is somewhat shorter and poorer, so that the spines are 

 more or less visible through it, at least on the head, flanks, 

 and limbs. In other respects I can find no external difference 

 between the two forms. 



Skull markedly swollen and weaker throughout than in 

 true C. mexicanus. Nasals parallel-sided, not expanded an- 

 teriorly. Forehead much inflated, the highest point at the 

 naso-frontal suture, vertically above the first true molar. 

 Interorbital region smooth, convex, broadening posteriorly, 

 where there are well-marked and considerably developed post- 

 orbital inflations. Brain-case small and narrow. Anterior 

 palate flat, not hollowed behind the palatal foramina. BuUse 

 high and narrow, well inflated. 



Incisors weak and narrow. Cheek-teeth comparatively 

 small. Premolar rather, but not conspicuously, larger than 

 the molars. 



Dimensions of the type (measured in skin) : — 



Head and body (c.) 440 millim. ; tail (c.) 380 ; hind foot, 

 s. u. 62, c. u. 74. 



Skull : greatest length 88 ; basilar length 75 ; zygomatic 

 breadth 48"5 ; nasals 30"5 x 19; height of forehead above 

 palate 97 ; interorbital breadth, anteriorly 30, posteriorly 36; 



