Elmis.] CLAVICOKNIA. 377 



miclrlle, with distinctly punctured stria?, which are stronger at sides than 

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

 legs very robust, brown, with the tarsi reddish. L. 8-85- mm. 



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

 Putney, Ripley, Hatfield, Woking, Tilgate ; Maidstone ; Norfolk ; Hastings ; Swansea ; 

 B^willey ; Repton and Burton-on-Trent ; Ripon ; Scarborough ; Manchester district ; 

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

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



E. 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 with the striae 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; Llangollen (River Dee); 

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

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

 latter streams) ; Scotland, not uncommon, Solway, Tweed, Clyde, Forth, Tay, Dee, 

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



E. subviolaceus, Miill. (Riolus sulviolaceus, Mulsant). This 

 species in general appearance much resembles E. wneus, 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. L. 

 2 mm. 



In running: streams, waterfalls, &c. ; local, but common where it occurs ; 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; Hipon ; Northumberland district, 

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



E. cupreus, Miill. (Riolus cupreus, Mulsant). Smaller than the 

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

 darker 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 



