108 HVDIJADEPHAGA — DYTISCIDAE. 



liglit brown, and their base, outer margin, and retlexed 

 margin always light brown. Common. 



H. melanocc'phalus, Steph. 

 ('. ('. Elytra entirely black. 



A a. Disc of thorax distinctly punctured. 

 A 1, Head black, sometimes reddish in 

 front and behind ; thorax entirely 

 black. 



a 1. Punctuation close ; upper-side 

 shining. 

 Scantily pubescent. Each elytron with two rows of 

 larger punctures. L. 1-^- 1. Not uncommon. 



H. discretes, Fairm. 

 b 1, Punctuation rather diffuse ; upper- 

 side somewhat dull. 

 Scantily pubescent. Each elytron with two rows of 

 larger punctures. L. 1| 1. Piather common. 



If. nigrita. Fab. 



B 1, Head pitchy-red ; thorax black, 



margins reddish. 



Scantily ])ubescent. Each elytron with the rudiments 



of two rows of larger punctures. Sides of thorax and 



elytra ibrming a very obtuse angle. Anterior tibiae short 



and very bi'oatl at apex. Punctuation moderately close and 



fine. L. 1^ 1. Scarce. H. eclat us, Clark. 



JB b. Disc of thorax nearly or quite im- 



punctate. 



A 1, Punctuation of elytra diftuse. 



(f 1. Elytra somewhat shiny. 



Tolerably oval, flat, scarcely pubescent. Black, shiny ; 

 head, side margins of thorax, antennae, and legs brown- 

 red; apex of elytra brown. Thorax only slightly nar- 

 rowed in front, scarcely rounded at sides, punctured at 

 margins, impunctate in middle; elytra parallel-sided until 

 beyond middle, ))luntly rounded at apex, finely and dif- 

 fusely punctured. L. 1^ — Ijl. Scarce. 



IT. vielanarius, Sturm. 



b 1. Elytra dull. 



Very similar to H. mclanarius, but narrower and more 

 depressed, with the elytra much duller, more sparingly and 

 more finely punctured, and not quite so destitute of pubes- 



