228 



Analytical Key to the Genera. 



Basal joint of the antennae much longer than the second, lami- 

 nate expanded. Asiraea and Delphix (sens strict) 

 (Note: These genera have not yet been recognized 

 from North America.) 



Basal joint of the antennas little longer than the second joint 

 or shorter. (2) 



2. Antenna;, first joint and outer edge of the second, in part, 



broadly expanded. Copicerus. 



Antenna? not broadly expanded, sometimes more or less 

 flattened. (3) 



3. Lateral carina? of the pronotnm reaching the hind edge or 



sometimes becoming obsolete a little within the 

 margin. (4) 



Lateral carinae of the pronotum deflected outwardly be- 

 hind the eyes, not touching the hind edge. (9) 



4. Median carina of the front forked at the apex of the head, 



the lateral carinae of the pronotum attaining the pos- 

 terior edge. (6) 



Median carina of the front forked some distance below its 

 base, or if forked on the apex of the head the lateral 

 carinas of the pronotum become obsolete before 

 reaching the hind edge. (5) 



5. Median carina of the front forked near or somewhat above 



its middle, the two branches abruptly seperated, 

 then running parallel to near the apex of the head. 



Dicranotropis. 



Median carina of the front forked nearer the apex of the 

 head, the two branches but slightly seperated, some- 

 times scarcely distinguished. Face in our species 

 crossed by a transverse piceous band covering most 

 of the clypeus. Apex of the front usually pale. 

 Scutellum in typical species small and the elytra in 

 brachypterous examples polished with the nervures 

 nearly obsolete. Pissotwtus n. gen. 



