220 FAMILY IV. DYTISCIDiE. 



i>nt' sub-basnl. (liroc in :in in'i'i;iil:u' nnv iit>Mr tin; uiiflflli-. iinrl fhrci' sub- 

 apical; these often bififl lichhirl. aiirl sometiuK's inni-c or Jess <;onfIiient. Sur- 

 face closely and fluelj- punctate. Length 4 mm. 



Laporte, Starke, Marshall and ^Marion counties; scarce. June 

 O-Juue 16. 



42-t (1361). Htdkopoecs xigeb Say. Trans. Amer. Phil. Soc, II, 182.3, 102; 

 ibid. II, 515. 

 Oval, rather convex. Nearly uniform piceous above ; head, legs and 

 region of humerus obscure reddish-brown; antennae fuscous, the liase 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. 



ilarion County, from •woodland pond near Broad Ripple; scarce. 

 April 4-I\ray 16. 



425 (1366). HyDEOPORfs modestus Aube. Spec. Gen., VI. 1S.3*. .576. 

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



legs and often the sides of abdomen nliscure reddish-brown. Thorax and 

 elytra finely and Indistinctly punctate, rather densely pubescent. Hind 

 coxal plates finely and sparsely punctate; mesosternum coarsel.v punctured; 

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

 tinct median carina. Length 5 mm. 



Throughout the State; trec|uent. April 4— October 21. The 

 males are more distinctly pimctured and more densely pubescent 

 than the females. 



426 (1323). Hydkopokis pkoximcs Aube, Spet-. Gen. des Hydrocan, 4^3. 

 Oval, slightly convex. Head and tliorax reddish-brown ; elytra piceous ; 



sometimes with antennae, legs and palpi reddish-brown. Thorax with sides 

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

 .3.5 mm. 



Lake County, from small pond near Pine; rare. August 21. 



427 (1359). Hydkopoeus dichbous 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 thorax, very 

 finely and evenly punctate. I^ength 4 mm. 



^Marion and Putnam countic^; siarce. April l^June 2IJ. 



428 (1358). Hydbopoeus -vmekicanus Aub^, Spec. (Jen., VI, 1S3S. 575. 

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

 brown; remainder of upper 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. 



