178 Mr. O. Thomas on 



are also two skins, presumably of 0. antillarum, in the United 

 States National Museum, as appears from Dr. Coues's remarks 

 in his Monogranh of N. -American Muridaj*. They were 

 captured about 1877. 



The fact that no specimen of this or any other indigenous 

 Murine has been taken in Jamaica for the last twenty years, 

 while Mus rattus and decumanus have devastated the island, 

 to be persecuted in their turn by the introduced Indian Mun- 

 goose, renders it highly probable that this animal has been 

 altogether exterminated there, like the Carib inhabitants of 

 the same region. But in the larger islands — Cuba and Hayti 

 — it is very likely that it (or a closely allied species) still 

 persists in the little known interior, where disturbances and 

 misrule have as yet prevented any scientific exploration. 



The second species (that from St. Vincent) may be termed 



Oryzomys victus, sp. n. 



Size and proportions about as in the larger members of the 

 0. longicaudatus group. General colour dark rufous, but 

 evidently affected by the spirit in which the specimen has been 

 preserved. Under surface buffy white, the bases of the hairs 

 slate-colour. Eyes without darker rims. Ears short, the 

 anterior part of their backs brown, not strikingly contrasting 

 with the general colour of the head. Hands and feet thinly 

 clothed with fine silvery hairs. Tail almost naked, brown 

 above, slightly paler below. Mammre 2 — 2 = 8. 



Skull with the general shape of that of South-American 

 0. lonyicaudatus, the brain-case being similarly lengthened 

 as compared with the broadened brain-case of the Central- 

 American 0. melanotis and its allies. Compared with a Rio 

 Janeiro example it is larger, more rounded, the supraorbital 

 edges less sharply square, but the parietal ridges thicker and 

 better developed. Molars larger and stouter, palate ending 

 only just behind the back of m.^. 



Dimensions of the type (an adult female, measured in 

 spirit) : — 



Head and body 96 millim. ; tail 121 ; hind foot without 

 claws 25, with claws 26*7 ; ear 14. 



Skull: basilar length 21*-4; basal length 23'8 ; greatest 

 breadth 15*1; nasals 11-2x^-5 4; interorbital breadth 4-5; 

 interparietal 3"2xl0; palate length from henselion 12'3 ; 

 diastema 7*8; palatal foramina 5 4x1*8; length of upper 

 molar series 4*1. 



Hah. St. Vincent, Lesser Antilles. 



* Mon. N. Am. Rod. p. 116 (footnote), 1877. 



