66 CALIFORNIA ACADEMY OF SCIENCES. 



Taschenberg has given sub-generic names to certain 

 pretty distinctly separable groups of species. These sub- 

 genera may be distinguished by the following table : 



A. With rounded temporal and occipital corners. No appendage on third 



segment of male, or a very small one. Stronglyocotes. 



AA. With angulated temporal and occipital corners. 



B. Antenna of male with segments 4 and 5 very short, third segment 



with appendage. Temporal angles weak. Coloceras. 



BB. Segments 4 and 5 of male antenna of ordinary size. Temporal 

 angles distinct. 

 C. Segment 3 of male antenna with appendage; segment 1 long 



and thick and sometimes with appendage. Goniodes s. sir. 

 CC. Segment 3 of male antenna without appendage (distal angle 

 slightly produced); segment 1 without appendage. 



Rhopaloceras. 



Genus Goniocotes Burmeister. General characters those 

 of Goniodes, but usually smaller species, and with an- 

 tenna of male never appendaged; the antenna? differ but 

 little in the sexes, the male sometimes having the first and 

 second segments larger than in the female. The species 

 of this genus are found on gallinaceous and columbine 

 birds. 



Genus Omithobius Denny. Body elongate, narrow; 

 head broad, rather quadrangular; clypeus with a frontal 

 emargination expanded within so that the bounding sides 

 are pincer-like in shape, the points almost meeting, thus 

 nearly inclosing the emargination ; the antennae arise far 

 in front of the middle of the head, and differ in the sexes; 

 the antennae of the male have the first two segments larger 

 than the others, and the third, which is diagonally trun- 

 cated and expanded distally, is with or without an append- 

 age; the abdomen has two parallel lateral bands on each 

 side, and the last segment of the male is pointed, of the 

 female rounded or truncate. Only three species of this 

 genus have been found, all on swans. 



Genus Botkriometopus Taschenberg. Body elongate, 



