Genus 1. Megacephala (stricte sic dicta) in- 

 habits the Old World, and forms the group (Ap tenia 

 of Serville). 



(Mandibles with three apical teeth). 



Section 1. Corpus apterum elytris postice dila- 

 tatis, humeris thoracis latitudini sequalibus. Species 

 Meg. Senegalensis. 



Sec. 2. — Corpus alatum elytris in medio lati- 

 oribus, humeris (sc. angulis anticis) magis promi- 

 nentibus, thorace latioribus. Species Meg. 4-signata 

 and Euphratica. 



Genus 2. Tetracha. — Westwood. — Inhabits the 

 New World. 



(Mandibles with four apical teeth). 

 (Typus Cic. Carolina, Linneus.) 



Genus 3. Aniara, Hope. — Type of the genus 

 C. sepulchralis, Fab. This insect diverging from 

 Megacephala and Tetracha, I consider as the type 

 of a sub-genus, it differs chiefly from the latter in 

 the following particulars. First, it is of a more 

 convex form than other known species having the 

 elytra scarcely more dilated than the thorax, near 



