220 FAMILY IV. - DYTISCTD^K. 



sub basal, three in in irregular ri\v near tin- middle, ;md tforep sub 

 apical ; these often bifid behind. ;ind sometimes more ur loss confluent. Sur- 

 face closely and lincly punctate. Length 4 mm. 



Laporte. Slarke. Marshall and Marion counties: scarce. June 

 9-June 16. 



424 (1361). HYDROPORUS NUiKK Say, Trans. Amer. Phil. Soc., II, 1823, 102; 



ibid. II. 515. 



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

 region of hnmerus obscure reddish-brown ; antennae fuscous, the base paler. 

 Thorax and elytra finely but distinctly and evenly punctured, sparsely 

 pubescent. Sides of nieso- 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). HYDROPORUS MODES-ITS Aube. Spec. Gen., VI. 183S. 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; 

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

 tinct median carina. Length 5 mrn. 



Throughout the State; frequent. April 4-October 21. The 

 males; are more 1 distinctly punctured and more densely pubescent 

 than the females. 



426 (1323). HYDKOPORUS PROXIMUS Aube, Spec. Gen. des Hydrocau, 



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

 sometimes with antenna 1 , 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). HYDROPORUS DICIIROUS 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 2!). 



428 (1358). HYDROPORUS AMERICANUS 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. 



