OCT., 1915. MAMMALS FROM BRAZIL AND PERU OSGOOD 197 



breadth 33 (30); interorbital breadth 12.2 (12.4); nasals 22.5x8.8 

 (22. 5 x 8.8); width of nasal branch of premaxilla 2.7 (1.3); interparietal 

 7X4.2 (11X5.2); width of audital bulla at point of greatest inflation 

 10 (8.6); diastema 14.2 (15.8); length of palate 24.5 (25.3); palatine 

 foramina 5.7X2 (7X1.2); upper toothrow (crowns) 13.2 (12.1). 



Remarks: The external differences between this form and Cavia 

 spixi are very slight and perhaps inconstant, but the cranial characters 

 are numerous and marked. Specimens from the state of Ceara, Brazil, 

 have been used to represent Cavia spixi for present comparisons although 

 Wagler's original description of that species states that the type was 

 obtained by Spix on the Amazon River. The name spixi has been 

 applied invariably by subsequent authors to the species of the arid inte- 

 rior catinga districts of northeastern Brazil in the states of Bahia and 

 Ceara. This region was traversed by Spix and Martius and in fact the 

 only mention of a cavy to be found in the account of their travels occurs 

 in a list of the animals of the Campos Geraes de San Felipe which is a 

 dry catinga region lying just east of the present settlement of Januaria, 

 Bahia. They spent considerable time in this region and especially men- 

 tion hunting there and collecting a number of animals.* The cavy is 

 listed under the native name prehd and is referred to Cavia aperea but 

 it is more than likely that the species of this region is the one which is 

 here regarded as typical spixi. In fact, until evidence to the contrary 

 is forthcoming, it seems necessary to disregard Wagler's statement of 

 locality, and to assume that the type came from this part of the state 

 of Bahia. Without examination of the type, this seems to be the only 

 course possible, for no specimens agreeing with the original description 

 are known from the Amazon Region unless those described as Kerodon 

 palustris, from the lower Tocantins River, be regarded as such. In 

 separating palustris from spixi, Thomas mentions no localities for spixi, 

 but it seems inferred that the name was applied to the animal from Bahia 

 and Ceara. t C. palustris, as described, differs from spixi and wellsi 

 in lacking a postauricular spot and in having small audital bullae. 



Eptesicus diminutus sp. nov. 



Type (dry skin and skull) from Sao Marcello, Rio Preto, Bahia, 

 Brazil. No. 20971 Field Museum of Natural History. Adult male. 

 Collected March 23, 1914, by Robert H. Becker. 



Characters: Similar in general to Eptesicus hilarii but smaller with 

 a particularly small light skull and a relatively slender tragus. Color 



* Spix and Martius, Reise in Brasilien, II, p. 542, 1828. 



f See Thomas, Ann. & Mag. Nat. Hist., (8), VIII, p. 608, June, 1911. 



