Ehnis.'\ CLAVicoHNiA. 377 



niidille, ■with distinctly punctured stritc, wliicli ;iie stronger at sides than 

 on disc ; under-side black, usually with apex of abdomen reddish-brown ; 

 legs very robust, brown, witli the tarsi reddish. L. 3-3 3- mm. 



In running water; local ; London district, not common, Micklcliam (River Mole), 

 Piitnev, Riiiley, Hatticld, Wolvintj, Tilfjatc ; Maidstone ; Norfolk ; Hastinir-s ; Swansea ; 

 B^vdUy ; Repton and Biirton-on-Trent ; Rip >n ; Scarborough ; Manchester district ; 

 Northumberland and Durham district ; Scotland, not scarce, Solway, Tweed, Clyde, 

 Forth, Tay, Dee, and Moray districts; Ireland, near Waterford (Power). 



XS. parallelopipedus, Miill. {Esolus parallelopipedus, Mulsant). 

 A small, narrow, oblong, rather depressed and parallel-sided species, 

 black or pitchy-black, shining ; antennae clear reddish-testaceous ; thorax 

 about as broad at base as elytra, parallel-sided, scarcely narrowed in 

 front, very finely punctured, with the engraved lines almost parallel and 

 not converging in front ; elytra parallel witli the strife scarcely marked, 

 but with the punctures rather strong towards base and becoming feebler 

 towards apex, with sixth interstice raised ; under-side dark reddish-brown, 

 legs reddish or reddish-brown with femora darker. L. 1 mm. 



In running;' streams; local and not common in England as far north as Northum- 

 berland, and in Wales; Devonshire, Exmouth and Exeter; Lhingolien (River Dee); 

 Repton ; Scarborough ; Manchester district ; Northumberland district, not uncommon, 

 Rivers Tyne, Irthing, Wansbeck, &c. (taken by Dr. Power in some numbers in the 

 la^ter streams) ; Scotland, not uncommon, Solway, Tweed, Clyde, Forth, Tay, Dee, 

 and Moray districts; Ireland, near Waterford (Power). 



S. subviolaceus, Miill. {Riolus sulviolaceus, Mulsant). This 

 species in general appearance much resembles E. (f:7ieus, being of about 

 the same size and colour ; it is, however, at once distinguished by the 

 absence of engraved lines at sides of the thorax ; antennae brown with 

 reddish base ; thorax narrower than elytra, fully as long as broad, very 

 finely punctured, with a small oblique impression on each side behind 

 middle, and an indistinct transverse impression on each side before middle, 

 which is often obsolete; elytra narrowed behind with very strongly 

 punctured striae, second, fourth, and sixth interstices somewhat raised ; legs 

 pitchy black or dark brown, claws bright red ; the general colour is, as 

 a rule, darker than in E. ceneus, and sometimes slightly violaceous. I>. 

 2 mm. 



In running streams, waterfalls, &c. ; local, but common where it oceurs ; Ventnor, 

 Isle of Wight, in abundance under stones at the foot of a small waterfall to the west 

 of the town; Llangollen, River Dee; Repton; Ripon ; Northumberland district, 

 Whittle Dene, River Wansbeck ; Scotland, local, Solway and Forth districts. 



E. cupreus, Miill. {Riolux cupreus, Mulsant). Smaller than the 

 preceding, aeneous, rather shining ; antennae reddish-testaceous, as a rule 

 ditrker towards apex ; thorax narrower than elytra, a little shorter than 

 broad, very slightly narrowed in front, finely punctured but not rugose, 

 with an oblique impression on each side close behind middle, and 

 another before posterior angles ; elytra oval and convex, rather short and 



