256 FAMILY VI. HYDROPHILID.E. 



<I<I. Form more broadly oval; elytral punctures larger and more dis- 

 tinct. 495. GLABER. 

 'Hi. Prosternal groove open in front; elytra with discal yellow stripe.-. 



496. STRIOLATUS. 



492 ( 15X9 ) . THOPISTERNUS NIMBATUS Say. Journ. Phil. 

 Acad. Nat. Sei.. Ill, 1823. 205; ibid. II. 

 130. 



Elongate-oval, convex. Olivaceous black, shining; 

 clypens. thorax and elytra margined with pale yellow ; 

 under surface black or piceous; legs yellow, femora 

 black at base. Length s.2-0 mm. (Fig. 127.) 



Throughout the State; common. March 14- 

 Oct'iber 9. At electric light in June. 

 -?!>> (1590). TROPISTERNVS MIXTUS Lee.. Proc. Phil. 



Fig. 127. X 4. (Original.) Acad - Nat ' Sci " VII < 1855 ' 30S - 



Elongate-oval, convex. Black, more or less bronzed, 



shining; antenna?, base of palpi and apical halves of femora and tibia? 

 brownish-yellow. Elytra with coarser and finer punctures intermingled, 

 these visible only under a lens. Length 8.5-9 mm. 



lake. T.aporle. Kosciusko, Putnam and Martin counties; fre- 

 ouent. May 5-October 25. 



494 (1593). TROPISTERXI/S SVBL.EVIS Lee., Proc. Phil. Acad. Nat. Sci., VII, 



1855. 308. 



Elongate-oval. Black, feebly bronzed ; antennae, palpi and legs dull 

 ye! low. base of femora piceous. Front half of sternal crest flat, finely but 

 distinctly punctured. Length 9-10 mm. 



Putnam County; rare. July 8. 



4!!5 (1591). TROPISTERNUS GLABER Herbst.. Col., VII, 398. 



Kesembles mi.rt us but usually broader and longer. Punctures of elytra 

 very fine and subequal in size. Front part of sternal crest concave and 

 very coarsely punctured. Length 9.5-11 mm. 



Throughout the State; common. March 16-October 23. Often 

 found beneath rubbish along the edges of ponds and lakes. 



490 (1595). TI:OPISTERNI s SPRIOLATUS Lee.. Proc. Phil. Acad. Nat. Sci., 



vii, 1855, ;;*;s. 



Elongate-oval, convex. Olivaceous black ; front of head and sides of 

 thorax yellow; elytra each with sides and six or more narrow stripes on 

 disk yellow ; under surface black, prosteruum and legs brownish-yellow. 

 Sternal crest sulcate throughout its full length. Length 9-10.5 mm. 



A species of southern range, taken only in Vigo and Knox coun- 

 ties; scarce. July 9-October 28. 



