3G0 CLAVICORNIA — TEICHOPTEIIYGIDAE. 



1, Metastenium reaching sides of body. 



Mesosterniim iDroadly ridged, epimera inflexed rather far 

 beneath ; metasternum scarcely j)rodiiced between coxae ; 

 intermediate coxae placed apart; posterior coxae somewhat 

 apart ; maxillary palpi with last joint curved, third joint 

 mnch thickened, longer than broad, as wide at apex as in 

 middle, second joint slightly thickened at apex. 



Ptilium, Er. 



2» Metasternum not reaching sides of body. 



Mesosternum very broadly triangularly ridged ; meta- 

 sternum produced between coxae, apex slightly rounded, its 

 episterna and epimera very large ; intermediate coxae 

 separated by ridge ; posterior coxae very broadly laminate, 

 rather far apart ; maxillary palpi with last joint curved, 

 third joint strongly thickened, ovate, much narrower at 

 apex than in middle, second joint somewhat thickened at 

 apex. Millidium, Mots. 



II» Pygidium covered by elytra. 



1, Base of thorax projecting over shoulders of elytra. 



Mesosternum l)roadly triangularly ridged, epimera in- 

 flexed rather far beneatli ; metasternum slightly produced 

 between coxae, angles of apex acute; intermediate coxae 

 not contiguous ; posterior coxae somewhat apart ; maxillary 

 palpi with last joint short, strongly bisinuate, third joint 

 much thickened, longer than broad, much narrower at apex 

 than in middle, nearly ovate, second joint sliglitly thickened 

 at base and apex. Actidium, Mat. 



2, Base of thorax not projecting over slioulders of 

 elytra. 



Mesosternum with a short broad ridge ; metasternum 

 pro(hiced l)ctween coxae, apex slightly rounded ; inter- 

 mediate coxae placed apart ; posterior coxae somewhat 

 apart ; maxillary palpi with last joint rather long, curved, 

 third joint much thickened, longer than broad, considerably 

 narrower at ajiex than in middle, somewhat ovate, second 

 joint slightly tliickened at apex, Ptenidiuiii, Er. 



&. Thorax Ijroadest at base. 



I, Metasternum reaching sides of body. 



Mesosternum sliort, slightly ridged, tlie ridge produced 

 between coxae; metasternum rather long, not produced 



