608 Mr. 0. Thomas im 



As to wlictlier or not these larva? are parasitic in tlicir 

 habitat is a matter o£ some doubt. It is probable that they 

 live in salt or brackish water, and that their presence in the 

 branchial chambers of crabs is purely accidental. The 

 structure of their bucco-pharyngeal organs, and especially 

 their possession of well-developed longitudinal pharyngeal 

 ridges, show that they are, to some extent at least, sapro- 

 phagous (see Keilin, 1915, I.e. pp. 127-132). They pro- 

 bably feed Qji the detritus of variable nature, which they 

 find in the branchial chamber of crabs, but it cannot be 

 denied that they may also obtain food, in the form of blood or 

 mucus, from the gills of the crab, by inflicting wounds with 

 their M'ell-developed lateral hooks and the dentate process 

 on the ventral surface of the head. 



LX. — On a furiler Culhction of AlammaJs front Jujvy 

 obtained hy Sr. E. Budin. By Oldfield Thomas. 



(Published by permission of the Trustees of the British Ma?eum.) 



During April, May, and June of this year Sr. E. Budin 

 returned to the region where his first collection had been 

 made in 1913, as lie knew of a' number of species which he 

 had not succeeded in obtaining, and of which he wished to 

 procure examples. 



In this refpect he was exceedingly successful, as the 

 present collection, consisting of one hundred and seventeen 

 specimens, included examples of no less than five new species, 

 besi<les nice sets of various other forms which had been 

 previously obtained by him in this and neighbouring provinces. 



How much Sr. Budin has contributed to our knowledge 

 of the mammalogy of this region is shown by the fact that of 

 twenty-two species in the present collection no loss than fifteen 

 have been now or previously discovered by him, while of the 

 thirty others from Jnjuy sent in earlier collections he was the 

 discoverer of eighteen, so that he is the first captor of no less 

 than thirt} -tline of the known mammals of Jujuy. 



Of the collection now dealt with tho most interesting are 

 the squirrel, never obtained before in the Argentine *, and 

 the Neotojnys, a swamp-rat congeneric with a Peruvian 

 species, and a very striking addition to the fauna of Jujuy. 



* Though recorded, ou the evidence of natives and of trnawed nut- 

 shells, by JNJatschie, SB. Ges. Nat. Fr. 1894, p. 61. 



