Oct., 1915. MAMMALS FROM BrazIL AND Peru — Oscoop 195 
their inferior surfaces.* Numerous less obvious peculiarities of the 
skeleton of Kerodon rupestris appear on close comparison. 
The remaining species may be divided into three groups of sub- 
generic rank, Cavia, Galea, and Caviella. Cavia has long been in use, 
Galea (type G. musteloides) has been regarded as a synonym of Kerodon, 
and Caviella has not heretofore received a name. Although Cavia has 
frequently been regarded as generically distinct from the species now 
included in Galea, the fact that several of the characters of Cavia and 
Galea are combined in Caviella strengthens the conclusion that the con- 
ditions may best be expressed by one generic and three subgeneric 
names. A synopsis of the entire group based on the most convenient 
and obvious characters is as follows:— 
Sternum narrow and rounded. Genus KERODON 
Species: Kerodon rupestris Maximilian 
Sternum broad and flat. Genus CAVIA 
Orbital branch of maxillary continuous; incisors unpigmented. 
Posterior enamel loop of middle cheekteeth decidedly larger 
than anterior and deeply indented on its outer border. 
Subgenus CAVIA 
Species: Cavia porcellus Linnzus,f C. aperea Erxleben, 
C. aperea azare Wagner, C. rufescens Lund, C. rufescens 
gutane Thomas, C. rufescens pamparum Thomas, C. 
rufescens venezuele Allen, C. cutleri Bennett, C. atahual- 
pe Osgood. 
Enamel loops of middle cheekteeth approximately equal in 
size and shape. Subgenus CAVIELLA 
Species: C. australis Geoff. & D’Orbigny, C. menas Thomas, 
C. niata Thomas, C. niata pallidior Thomas. 
Orbital branch of maxillary broadly interrupted by lacrymals; 
incisors pigmented. Subgenus GALEA 
Species: C. musteloides Meyen, C. boliviensis Waterhouse, 
C. boliviensts leucoblephara Burmeister, C. boliviensis 
littoralis Thomas, C. auceps Thomas, C. spixi Wagler, 
C. palustris Thomas, C. wellst sp. nov. . 
* This character is shared with Cavia, but istingui c 
7? a A lag scien Ne but sharply distinguishes from Galea; no 
T Domestic guinea pig; syn. C. cobaya. 
