33G . COLEOPTERA OF NORTH AMERICA. 



The claws are called simple, when they have the ordinary 

 pointed form, slightly but not suddenly broader at the base. 



They are cleft when divided into two acute parts, which may 

 or not be of equal length. 



They are aiypendiculate when provided with a square dilata- 

 tion at the base, and pectinale when toothed in a manner already 

 seen in many genera of Carabidas, and in all Cistelida3. 



In position they may be defined as connate when they are 

 united" at base ; approximate when they are inserted near to- 

 gether; divergent when without being distant at base they form 

 an angle, as in most Coleoptera; divaricate when they are inserted 

 at opposite sides of the last tarsal joint. This last form is already 

 familiar to us in some groups of Laniiadse. 



The tribes are numerous, and group themselves into four cate- 

 gories, to which names have been applied, though they do not 

 seem to be worthy of rank as sub-families, and will therefore not 

 be referred to below : — 



Front normal, mouth anterior. 2. 



Front inflexed, mouth inferior. (CRYPTOSTOMES.) 10. 



2. Middle ventral segments not narrowed ; last dorsal segment not ex- 



posed. 3. 



Middle ventral segments narrowed ; last dorsal segment exposed, de- 

 clivous. (CAMPTOSOMES.) 5. 



3. Prothorax not margined. (EUPODA.) 4. 

 Prothorax margined (exceptions in 8). (CYCLICA.) 7. 



4. Prosternum very narrow, claws simple, divergent ; 1st ventral segment 



very long. I. Donaciini. 



Prosternum distinct (clavrs cleft) ; 1st ventral segment longer than 



the 2d. n. Sagrini. 



Prosternum very narrow ; 1st venti-al segment scarcely longer than 



the 2d. III. Ckiocerini. 



5. Antonnse not received in grooves. 6. 

 Antennae received in marginal grooves, in the flanks of the prothorax. 



V. Chlamydini. 



6. Front coxal cavities confluent. IV. Clythrini. 

 Front coxse separated by the prosternum. VI. Cryptocepualini. 



7. Antennse widely separated at base 8. 

 Antennae approximate, inserted on the front. 9. 



8. Front coxa3 rounded ; 3d tarsal joint bilolied. VII. Eumolpini. 

 Front coxae transverse ; 3d tarsal joint entire. VIII. CnRvsoMELiNi. 



9. Front coxae conical, prominent. IX. (talerucini. 

 10. Head free. X. Hispini. 



Head concealed under prothorax, which with the elytra is widely 

 margined. XI. Cassidini. 



