1898.] MAMMALS TROM CHUBUT. 211 



numerous in the thick scrub and brushwood in the neighbourhood 

 of the Colony, and universally distributed. It makes a small oval 

 nest of fine grass and any soft material, which it places in the 

 centre of a thick bush. It never burrows in the ground, but is 

 extremely numerous among the thorn-bushes." — H. D. 



3. Eligmodontia geacilipes "Waterh. 



a, h. Ad. $ and yg., Mar. 18, 1878. 



This Mouse is probably the same as the little species from La 

 Plata which I have hitherto identified with i\zara's "Laucha," but 

 owing to the nearness ot Chubut to the type-locality- of B.gradlipes, 

 Bahia Blanca, I provisionally use Waterhouse's name as most cer- 

 tainly pertinent. The species differs from most other S. American 

 Muridae in its larger number of mammae, possessing from 5 to 7 

 on each side of the belly, placed equidistant from each other, and 

 not definitely separable into pectoral and inguinal series. Pro- 

 visionally also I use the generic name EUgmodontia not only for 

 the long-tailed species, such as E. griseoflava, eJegans, and moreni, 

 but also for the short-tailed E. gmcilipes and E. bimacuhtia, to 

 which Eengger's " Alns caUosiis" and my " Oryzomys (?) venustus " 

 may ultimately prove to be allied. Purther examples of all these 

 doubtful forms are very much wanted. 



" IN'ot so common as the other species ; makes a nest in a thick 

 bush about a foot above the ground. The nest is made of grass 

 torn into fine fragments." — R. D. 



4. Akodon CAifEscENS Waterh. 



a, b. Dec. 1877 and Apr. 1, 1878. 



I am not quite satisfied that this Mouse ought to be distinguished 

 from the common A. arenicola of S. Uruguay and Buenos Ayres, 

 although there is a certain amount of difference in colour between 

 the two. The type of A. canescens came from Port Desire, Pata- 

 gonia ; that of A. arenicola from Maldonado. 



" Common in straw-heaps and in granaries." — H. D. 



" Unlike the long-tailed Mouse this animal burrows in the 

 ground, or more usually takes possession of some of the numerous 

 cracks which may be always found in the earth, and appi'opriates 

 them for its home. It has five or six young at a birth. It is pretty 

 common, but not so numerous as the long-tailed Mouse.*' — H. D. 



■■& 



5. Qtenomts MAGELLAsricrrs Benn. (?). 



a. Yevy young. Tombo Point, Jan. 3, 1878. 



" I know nothing of this species. I took it near Tombo Point, 

 almost 60 miles to the south of the Colony, and it is the only 

 specimen of this species I have seen. I found it close to the sea- 

 shore."—- £r. D. 



6. Catia axistealis Geoflfr. 



a, I. Ad. and yg. Mar. 14 & 18, 1878. 



The external resemblance of this Cavy to the skin of C. boliviensis 



14» 



