Oct., 1915. MAMMALS FROM BraziL AND Peru — Oscoop 197 
breadth 33 (30); interorbital breadth 12.2 (12.4); nasals 22.5x8.8 
(22.5 8.8); width of nasal branch of premaxilla 2.7 (1.3); interparietal 
7X 4.2 (11X 5.2); width of audital bulla at point of greatest inflation 
to (8.6); diastema 14.2 (15.8); length of palate 24.5 (25.3); palatine 
foramina 5.7 2 (71.2); upper toothrow (crowns) 13.2 (12.1). 
Remarks:— The external differences between this form and Cavia 
spixt 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 prehé 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 spixt. 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 spixt, Thomas mentions no localities for spixt, 
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 Sa6 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. 
t See Thomas, Ann. & Mag. Nat. Hist., (8), VIII, p. 608, June, 1911. 
