TRIBE VII. ERIRHIXIXI. >1 



distinct; disc finely, rather densely granulate-punctate. Elytra at base 

 one-third wider than thorax, sides parallel for two-thirds their length, 

 then evenly converging to an obtuse apex; striae fine, indistinctly punc- 

 tate; intervals with transverse rugse without evident seta?. Length 2 2.3 

 mm. (W. 8. B.) 



Kosciusko, Marion, Vennillion and Posey comities, Indiana; 

 April IS July 12. Six specimens taken by sweeping and sifting. 



Subtribe IV. HYDROXOMI. 



The species of this snbtribe live upon semiaquatic plants and 

 the body of fresh specimens is clothed with a dirty brown water- 

 proof coat, formed of scales and a gummy exudation ; head not 

 prolonged behind, the eyes contiguous to thorax; funiculus only 

 6-jointed in a number of genera. Our nine eastern genera are 

 separated as follows : 



KEY 10 CEXERA OF SUBTRIBE IV. 



a. Beak very short and broad, not longer than head; tarsi narrow, the 

 third joint deeply emarginate. X. STEXOPELMUS. 



fl. Beak cylindrical, much longer than head. 



&. Third joint of tarsi either emarginate or bilobed. 



c. Beak curved; funicle 6-jointed, the second joint short; third joint 



of tarsi broad, deeply bilobed, last joint short. 



(1. Last joint of tarsi with but one claw. XI. BKACHYBAMUS. 



dd. Last joint of tarsi with two claws. 



e. Last joint of tarsi broad, the claws well separated. 

 /. Elytra but slightly if any wider than thorax; length usually 

 1 or more mm. XII. EXDALCS. 



ff. Elytra much wider than thorax; length less than 1.5 mm. 



XIII. TANYSPHYUI s. 



ee. Last joint of tarsi narrow, projecting beyond the lobes of 



third, the claws slender. XIV. OXYCHYLIS. 



cc. Beak straight; second joint of funicle long; last joint of tarsi 



long. 



g. Tibia? not serrate on the inner side; third joint of tarsi broad, 

 deeply bilobed; funicle 7-jointed. XV. AXCIIODEMUS. 



gg. Front and middle tibia? serrate on the inner side; third tarsal 

 joint narrow, slightly emarginate; funicle 6-jointed. 



XVI. LIXELLUS. 

 bb. Third joint of tarsi simple; legs long and slender. 



//. Club of antenna? partly smooth and shining; funicle 6-jointed; 



prosternum not excavated. XVII. LISSOBHOPTKTJS. 



7(7). Club of antenna? entirely pubescent and sensitive; funicle 7- 



jointed; prosternum broadly and deeply excavated in front of 



coxa?; thorax feebly constricted near apex. XVIII. BAGOT*S. 



X. STENOPELMUS Schon., ISSfi. (Gr., "narrow" -f "feet.") 



Form very short and broad; antenna* inserted near middle of 

 beak, on the upper surface rather than on the sides ; scape long. 



