XOVITATBS ZoOLOGICAF XXI. 1914. 251 



placed at some distance from the pygidium. The row of bristles at the apex of the 

 hindtibia is interrupted, not forming a regular comb. The head of the receptaculum 

 seminis of the ? is of the ordinary sausage shape. 



a. Anterior portion of helmet only as wide as the comb. 



a'. Upper spine of geual comb less than half the length of the other 

 genal spines. Only the S known. Ecuador. 



C. achilks Roths. (1911). 

 ^'. Upper spine but slightly, though appreciably shorter, and narrower 

 than the other genal spines. Both sexes known. Chile. 



C. wolfsohni Roths. (1909). 



b. Anterior portion of helmet twice as wide as the comb. Only the ? known. 



Peru. ......... C. pallas sp. nov. 



B. The two long genal bristles are both placed on the oesophagus {i.e. in the 

 place where the latter shines through) (tcolfkuegeli and minerva) or the upper 

 bristle considerably more forward than the second {mam, ares, inca). There are 

 two or three antepygidial bristles, at least in the ? . The pygidium is not convex 

 posteriorly ((?¥). The tenth tergite is not sejiarated from the ninth by a suture. 

 The head of the receptaculum seminis (?) is constricted or humped. The row of 

 stout bristles at the apex of the hindtibia is not interrupted. 



c. The two genal bristles are placed on the oesophagus shining through. The 



first segment of the maxillary palpus considerably longer than the foul'th. 

 Three antepygidial bristles in the ?. Receptaculum seminis (?) with 

 hump. 



c\ Seven genal spines. The longest apical dorsal bristle of the hindtibia 

 reaches (or almost) to the apex of the first tarsal segment, and the 

 corresponding bristle of this segment nearly to the apex of the 

 second segment. Argentina. Both sexes known. 



C. wolffhuegeU Roths. (1909). 

 f/'. Five genal spines. The before-mentioned bristles shorter. Para- 

 guay. S not known C. minerva Roths. (1903). 



d. The rijjper genal bristle much more frontal than the second. The first 



segment of the maxillary palpus slightly longer than the fourth. The 

 receptaculum seminis ( ? ) with deeply constricted head. 



e\ Five genal spines. Three rows of bristles on the pronotnm. Three 

 antepygidial bristles. Chile. S not known. 



r. ares Roths. (1911). 



/'. Six genal spines. Two rows of bristles on the pronotnm, third row 



vestigial. Two antepygidial bristles. Tierra del Fuego. S not 



known. ...... C. mars Roths. (1898). 



y'. Like mars, but with five genal spines. Pern. 6 not known. 



C. inca spec. nov. 



