Curculionince.~\ RHYNCHOPHOEA. 215 



rostrum usually carinate ; trochanters nearly always 



furnished with a long projecting seta, 

 aaaa*. Onychium not extending beyond the lobes of 

 the third tarsal joint ; species very small, sub- 

 aquatic TANYSPHYBINA. 



bbbb*. Onychium extending considerably beyond the 

 lobes of the third tarsal joint ; insects of moderate 



or large size. 

 aaaaf. Opening of scrobes visible in front if viewed 



from above; rostrum stout CUBCCLIOXIXA. 



bbbbf. Opening of scrobes not visible from above ; 



rostrum long and slender EEiEEHiiriyA. 



bbbf. Third joint of tarsi long behind base of onychium 

 truncate or emarginate at apex, rarely slightly 

 bilobed ; * insects aquatic or sub-aquatic, usually fur- 

 nished with a hydrofuge tegument BAGOINA. 



bj. Epimera of mesosternum extending between thorax 

 and elytra, and with its extremity visible from above; 



anterior coxae usually separated (p. 214, line 12). 



*. Tibiae without a curved hook at their apical internal 



angle ; tarsal claws often appendiculate ; body 



behind thorax usually short and broad and often 



subglobose; upper surface, as a rule, strongly 



squamose CEUIHORBHYXCHINA. 



**. Tibiae with a strong curved hook at their apical 

 internal angle ; tarsal claws simple ; body oblong, 



and as a rule glabrous BABINA. 



B. Funiculus of antennae composed of five joints. 



a. Abdomen with segments 2-4 produced into a point 



on each side at apex crONi>'A. 



b. Abdomen with segments 2-4 straight or regularly 



curved at apex GYSINETBINA. 



2. Tibiae with a curved hook at their apical external angle ; 

 abdomen with segments 24 straight on their apical 

 margin. 



A. Antennae abruptly geniculate; anterior coxa? more or 



less separated. 



a. Prosternum deeply channelled between the anterior 



coxae for the reception of the rostrum CBYPTORRHrNCnixA. 



b. Prosternum not channelled. 



a*. Femora strongly toothed ; upper surface furnished 



with broad raised claviforrn scale-like hairs . . . TBACHODINA. 

 b*. Femora not toothed. 



af. Under surface of body uniformly clothed with 

 scales ; third tarsal joint very strongly bilobed ; 



pygidium of male divided FissoDiyA. 



bf. Under surface of body glabrous or almost 

 glabrous ; third joint of tarsi smaller and less 

 strongly bilobed ; pygidium of both sexes un- 

 divided COSSOSINA. 



B. Antennae feebly geniculate ; anterior coxa? con- 



tiguous MAGDALIXA. 



* The third joint of the tarsi is rather short and slightly bilobed in Bagous lutosus, 

 Gyll., and B. glalrirostris, Herbst., which must therefore be regarded as to a certain 

 oxteut exceptions. 



