110 HYDRADEPHAGA— DYTISCIDAE. 



tlie eyes; thorax black; elytra l)rown, darker on disc, 

 closely punctured. L. 1\ 1. Rather common. 



H. umhrosHs, Gyll. 



2> h. Punctuation of elytra strong and 

 rather close. 



Elliptic, rather convex. Upper-side reddish pitch-brown, 

 scarcely pubescent ; head lighter in front. Disc of thorax 

 almost inipunctate, margins diffusely and rather finely 

 punctured. L. 1-?; 1. Common. H. ohscurus, Sturm. 



e e. Elytra black-brown, with outer margin, 

 an ol)lique bandlike spot at base, and a 

 marking near side Ijehind yellow. 

 A a. Oblong oval ; pubescence on elytra 

 long. 



A 1. Colour darker ; yellow markings 

 near side of elytra behind consisting 

 of a simple streak. 

 Head brown ; thorax black-brown ; sides reddish ; under- 

 side of tliorax brown in the middle, l)lackish before anterior 

 coxae. Eess pointed Ijeliind than H. ixihtstris. L. 1^ 1. 

 Moderately common. H. vittula, Er. 



Ji 1 . Colour lighter ; yellow marking near 

 side of elytra behind consisting of two 

 spots united by a line. 



Head red, darker between the eyes; thorax brown ; sides 

 red ; under-side l)lack, that of head and thorax rust-red. 

 L. If 1. Common. H. 'palustris, Lin. 



H h. Oval ; pubescence of elytra rather finer 

 and more sparing. 

 Allied to //. 2wlmtris, but larger, especially broacler, with 

 the pale markings less developed and not so distinct from 

 the ground colour. Disc of thorax punctured more finely 

 and s])aringly than the margins; elytra punctured rather 

 more distinctly tlian in i/. jja/ws^?-k L. If 1. Not com- 

 mon. H. incoyiiitus, Sharp. 



2? Ji. Thorax rust-red. 



a ((, Disc of tliorax distinctly punctured, base 

 with a shallow depression on each side. 

 Elonu-ate oval. Head rust-red ; thorax not niuch nar- 



