Genus Centriiius and its Allies. 323 



Claws uuited at the base. 



Canal nearly obsolete or absent. 



Pectus with a circumscribed central 



cavity Ciunelodes. C. Leachii, Kirby. 



Pectus entire. 



Mesosternum raised, more or less 



bilobed in front Diastethus. C. tiiinidus, Boh. 



Mesosternum depressed Pardisomus. C, guttatuSy n. sp. 



Canal distinct. 

 Coxte approximate. 



Corbels of posterior tibiaa cavern- 

 ous Telemiis. C. cestrotus, Germ. 



Corbels of posterior tibiae open . . Sympages. C. egregius, n. sp. 



Coxse separated Orissus. C. Meigenii, Boh. 



To the genera above not represented by new species the 

 following characters will apply : — 



Centriiius. — Canal obsolete or replaced by a circumscribed 

 cavity ; anterior coxte separated ; femora mutic ; claws free ; 

 elytra broader than the prothorax. 



Gerceus. — Canal obsolete ; anterior coxse separated ; femora 

 mutic ; claws free ; elytra not or scarcely broader than the 

 prothorax. 



Balbus. — Canal obsolete ; anterior coxee separate ; pro- 

 sternum on a level with the coxce ; femora mutic ; claws free. 



Lydamis. — Canal distinct ; anterior coxas approximate ; 

 aerobes lateral ; femora toothed ; claws free. 



Rhianus. — Canal distinct, prolonged between the anterior 

 COX83 ; femora mutic ; claws free. 



Camelodes. — Canal replaced by a circumscribed cavity ; 

 anterior coxa separated ; mesosternum raised ; femora 

 toothed J claws united. 



Diastethus. — Canal absent ; anterior coxae separated ; 

 mesosternum raised, often emarginate anteriorly ; femora 

 toothed ; claws united. 



Telemus. — Canal distinct ; anterior coxa3 approximate ; 

 mesosternum depressed or sloping towards the prosternum ; 

 femora mutic ; corbels of the posterior tibia3 cavernous ; claws 

 united. 



Orissus. — Canal distinct ; anterior cox^e separated ; meso- 

 sternum depressed or sloping ; femora toothed; claws united. 



In some species of Centriiius, Camelodes, &c. the males are 

 armed with horizontal spines projecting from the pectus, on 

 each side of where the canal is or should be ; but I hesitate 

 to consider this a generic character. Xenisus and Enops, 

 new genera, are allie.s. 



