22Q Mr. 0. Thomas on 



Structurally this species of Nemesia may be distinguished 

 by the \yide space separating the lateral eyes and the presence 

 of a few cusps on the labium. In the strong procurvature 

 of the eyes of the anterior line it resembles the Chinese 

 N. sinensis, Poc. (P. Z. S. 1901, p. 212). 



The most remarkable feature connected with it, however, 

 is the habit of constructinp; its dwelling on the trunks of trees 

 instead of burrowing in the ground like the species of the 

 genus hitherto discovered. 



The nest much resembles that o^ Moggridgea and other 

 allied genera. It consists of a subcylindrical silk tube, 

 stiffened and concealed with chips of bark and other debris. 

 The largest measures 52 millim. in length and 15 in width. 

 The shape of the tube, however, is not constant. The door 

 is fairly thick and strong, somewhat bevelled towards the 

 margin, and fits into the orifice when closed. One of the 

 nests contained the carcase of a fly and the leg of a bee 

 belonging, as I learn from Col. Bingham, to a male of the 

 genus Anthophora. 



XXVI. — New Species of Oxymycterus, Thrichomys, and 

 Ctenomys/rom S. America. By Oldfield Thomas. 



Oxymycterus qucestor, sp. n. 

 One of the large reddish forms allied to 0. nasutus, but 

 larger. 



Size fairly large. Median dorsal area yellowish tawny, 

 heavily lined with black, gradually passing on sides and 

 rump into deep reddish tawny, and from that again on the 

 belly into rich ochraceous^ the hairs slaty grey at their bases. 

 Crown and middle line of face more heavily black-lined than 

 the back. Cheeks like sides. Ears rather large, their fine 

 hairs uniformly blackish. Front of forearms and upper 

 surface of hands brown ; inner surface of arm dull greyish 

 buffy, a marked dark brown patch on each wrist. Legs dark 

 rufous; upper surface of feet brown. Tail finely haired, 

 blackish throughout. 



Skull long and narrow, markedly narrower in the brain- 

 case than in the more northern 0. hispidus. Muzzle long, 

 narrow, parallel- sided ; the nasals elong^ited, broadened, and 

 slightly retroiisses. Palatal foramina reaching to the level of 

 the first third of m^ ; posterior nares level with the back 

 of m\ 



