HYDROPHILID.^. 



31 



b. Elytra without the markings of 



H. quadrisignatus. 

 a*. Sides of thorax evidently conver- 

 gent in front as well as behind. 

 af. Thorax at the base twice as wide 

 as its length down the middle, much 

 narrowed behind. Elytra brown - 

 bronze, or at least with a bronze 

 reflection, the fine punctuation on 

 the interstices in the scutellar 

 region irregular or in double rows . 



bf. Thorax at the base 1^ times as 

 wide as its length down the middle, 

 but little nai'rowed behind. Elytra 

 without bronze reflection, the 

 punctures in the interstices in 

 the scutellar region in a single row 



b*. Sides of thorax not evidently con- 

 vergent in front, contracted from the 

 apex to the base in a nearly straight 

 line. 

 at. Elytral interstices usually quite 

 flat, nearly three times as wide as the 

 length of the section of stria between 

 each puncture. The rows of inter- 

 stitial punctui'es relatively more 

 evident than in the two following 

 species by reason of the compara- 

 tively smaller size of the punctures 

 in the strije. Disc of thorax simply 

 pvinctured ..... 

 bt. Elytral interstices usually dis- 

 tinctly convex, less than twice as 

 wide as the section of stria between 

 each puncture. Punctuation of disc 

 of thorax areolate, i.e. the punctures 

 placed singly in the meshes of an 

 impressed irregular reticulation, 

 aj. Elytra, in the lateral aspect, 

 resembling those of H. brevipalpis; 

 compared with If. granularis, longer 

 in proportion to their height, the 

 slope of their apical third very 

 gradual. Flattened part of sides 

 of thorax broad .... 



H. viRiDicoLLis, Steph. 

 {ceneipennis, Thorns.) 



H. DORSALis, Marsh, nee 

 Brit. Cat. {mtdsanti, Rye) 



H, AFFiNis, Marsh. 



H. GRiSEUS, Berbst. 



