IIKLOPHORUS. 137 



striae, interstices convex, alternate ones distinctly more 

 raised. L. 1^ 1. Moderately common. 



H. arvcrnicus, MuLs. 



II. Interstices on thorax finely punctured. 

 01)long. Head and thorax brassy-green, sides of latter 

 straight, palisli ; elytra brown, with a round pale spot near 

 apex, another near side margin, slightly before middle, and 

 an oblique one from scutellum backward ; legs, palpi, and 

 antennae pale. Elytra dilated behind middle. L. 1| — 2^1, 

 Moderately common. II. dorsalis, Marsh. 



b. Inner lateral furrows on thorax straight. 



Oblong oval. Head and thorax pitch-brown, latter with 

 narrow, deep, and almost straight furrows, central interstices 

 almost smooth, lateral ones more or less wTinkled, disc 

 convex ; elytra brown-yellow, with indistinct spots, with 

 deep notched striae, interstices narrow and convex. L. 1 j 1. 

 Not uncommon. If. naiius, Sturm. 



Hydrochiis, 



A, Some interstices on elytra raised into ridges. 



a. Elytra black, with ten rows of punctures and the 

 alternate interstices raised nearly to apex. 



I, Body oblong ; thorax as long as broad. 



Head and thorax Ijlack, strongly punctured ; latter with 

 five depressions in two transverse rows, sides curved. 

 L. 1| 1. Not common. H. brevis, Herbst. 



II, Body elongate ; thorax longer than broad. 

 Head and thorax black, strongly punctured ; latter with 



five depressions, sides almost straight. L. 1| 1. Mode- 

 rately common. //. carinatus, Germ. 



b. Elytra bronze-black or brown, with ten rows of punc- 

 tures, the alternate interstices raised until beyond 

 middle, the fourth interstice also raised behind. 



Elongate. Head and thorax bronze-green or black, 

 strongly punctured ; latter longer than broad, with five de- 

 pressions, sides somewhat rounded. L. 2 1. Connnon. 



H. elo7i(jatus, Schall. 



H. None of the interstices on elytra raised into ridges. 



