zzu FAMILY IV: DYTISCIDJE. 



one sub-basal, three in an irregular row near the middle, and tbrc^ sub 

 apical; these often bifid behind, and sometimes more or less confluent. Sur- 

 face closely and finely punctate. Length 4 mm. 



Laporte. Starke. Marshall and Marion counties; scarce June 

 9-Jime 16. 



424 (1361). Hydropoeus niger Say. Trans. Amer. Phil. Soc. II, 1823, 102: 



ibid. II. 515. 



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

 region of humerus obscure reddish-brown ; antennas 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 near Broad Ripple; scarce. 

 April 4-May 16. 



425 (1366). Hydropoeus modestus Aube, Spec. Gen.. VI. 1838. 576. 

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



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

 elytra finely and indistinctly punctate, rather densely pubescent. Hind 

 coxal plates finely and sparsely punctate; mesosternum coarsely punctured: 

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

 tinct median carina. Length 5 mm. 



Throughout the State: frequent. April 4-Oetober 21. The 

 males are more distinctly punctured and more densely pubescent 

 than the females. 



426 (1323). Hydropoeus proximtjs Aube. Spec. Gen. des Hydrocan, 483. 

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



sometimes with antennas, legs and palpi 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 (1359). Hydropoeus dicheous 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. Length 4 mm. 



Marion and Putnam counties; scarce. April 4— June 29. 



428 (1358). Hydeopoeus americaxus Aube, Spec. Gen.. VI, 1838, 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. 



