200 Mr. O. Thomas on small MaynmaJa 



In addition, his material o£ the short-tailed mole-like 

 burrowing rats lias p;reatly advanced our knowledge of these 

 interesting and litlle-knowu animals, which now prove to 

 belong to two diatinct genera, of which, again, one needs 

 description as new\ 



Our thanks are due to the kind friends who gave Sr. Budin 

 help and hospitality, and to Sr. Budin himself for the keen 

 and successful mauner in which he has curried out the mission 

 entrusted to him. 



1. Lasiurus horealis, Miill. 

 ? . 60, &(S. Beatriz, Nahuel Huapi. 800 m. 



2. Oryzomys magellanicxis miziirus, Thos. 



S • 195, 197, 200, 212, 215 ; ? . 175, 191, 192, 196, 198, 

 199, 220. Maiten, Upper Chubut R. 700 m. 



(?) S- 58, 102, 105, 113, 118, 119. Beatriz, Nahuel 

 Huapi. 800 m. 



" The most common species at Maiten. Called ' Coludo.' " 

 —E.B. 



3. Reithrodon cuniculoides, Waterh. 



? . 173. Maiten. 700 m. 



Being a single specimen only I am not able to satisfy 

 myself as to what subspecies of R. cuniculoides this should 

 be referred to. All the forms that have been named in this 

 difficult group are .distinguished by somewhat intangible and 

 more or Jess variable characters. 



4. Phyllotis xanthopygus, Waterh. 



cJ. 128, 129, 132, 133, 134, 136, 147, 148, 151, 153; 

 ? . 130, 131, 137, 138, 140, 146, 149. Pilcaueu. 1400 m. 



In these specimens the bulfy wash on the under surface is 

 far more marked than would be supposed from either Water- 

 house^s or Allen's description. But the type — no. 55.12.24.185 

 — shows clearly the same general buffy tone to the hairs of 

 the belly, none of them being really tipped with white. 



" Oaugiit among the cactus-plants.^^ — E. B. 



5. Irenomys longicaudatus, Phil. 



(J (imm.). 73. Beatriz, Nahuel Huapi. 800 m. 

 This most interesting specimen represents the re-discovery 

 of Philippi's Reithrodon longicaudatus, whose identity has 

 ong been a mystery. It proves, as miglit be expected, to 

 belong to an uudescribed genus, which may be called 



