220 FAMILY IV. DTTISCrD^.. 



out' sub l)!is:il, lliicc in .-iii iii-cmil,i r idw iic.ir Ihc middle. mikI ilirci' sub 

 .■i]>ii'al ; tlies(> (il'lcii liilid licliihd. ;ind sninoliiiics iiHirc nr less coiillMont. Snr- 

 r.Mcc c'lost'l.v ;iiid liml.v |iuiic(;it('. Lcu.utli I nun. 



La])()i'1('. Stjiikc. Arin-slinll aiul ]Mai'ii>ti couiifies; senree. Jmw 

 9-.Tnne 1 (i. 



424 (1361). IIvDRoroius mcei: Say, Trans. Anicr. riiil. Soc, II, 1823, 102; 



il)ifL II. 515. 

 Oval, rather convex. Nearly uniform i»iceous above; head, legs and 

 region of humerus obscure redrtish4)rown ; anteuure fuscous, the base paler. 

 Thorax and elytra finely but distinctly and evenly punctured, sparsely 

 pubescent. Sides of meso- and metasterna and base of abdomen coarsely 

 punctured. Length 3.7-4 mm. 



^Marion County, from woodland pond n(>ar Broad Ripple; seareo. 

 April 4-I\ray IG. 



425 (1360). IIvDKOPORrs modksti's Aubc, Spec. Gen., VI, 1S3S, 576. 

 Oblong-oval, subdepressed. Piceous; head, sides of thorax and elytra, 



legs and often the sides of abdomen obscure reddishdn-own. Thorax and 

 elytra finely and indistinctly punctate, rather densely pubescent. Hind 

 coxal plates finely and sparsely punctate; mesostenumi coarsely punctured; 

 metasternum and abdomen almost smooth. Prosternal spine with a dis- 

 tinct median carina. Length 5 mm. 



Throughout the State; frequent. April 4-Octol)er 21. The 

 males are more distijntly punctured and more densely pubescent 

 than the females. 



426 (1.323). IIydkopohis puoximus Aube, Spec. Gen. des Hydrocan, 483. 

 Oval, slightly convex. Head and thorax reddisli-browu ; elytra piceous ; 



sometimes with antennae legs and palia reddish-brown. Thorax with sides 

 feebly rounded, hind angles obtuse, disk sparsely punctate. Length 3- 

 3.5 mm. 



Lake County, from small pond near Pine; rare. August 24. 



427 (1.359). HvuKOPoiius diciiuous Melsh., Proc. Phil. Acad. Nat. Sci., II. 



1844, 28. 

 Broadly ovate, obtuse in front, pointed behind. Uniform reddish-brown 

 above ; elytra rather thickly pubescent ; legs and often the abdomen reddish- 

 brown; pectus black or piceous. Upper surface, except disk of tliorax, very 

 finely and evenly punctate. Length 4 mm. 



IMarion and IMilnam connties; scarce. A])ril 4-June 29. 



428 (1358). Hydroporus amekicanus Aube, Spec. Gen., VI, 1838, 575. 

 Elongate-oval, subconvex. Head, legs and disk of thorax pale reddish- 



bi'own ; remainder of upiier surface, uniform dark reddish-brown. Disk of 

 thorax almost smooth. Pubescence of elytra less dense than in allied 

 species, usually distinctly visible only on the sides. Length 4 mm. 



