31 



Genus [280]. Dryops. OUv. One species. 



D. Duraerilii, Latr. Dusky black ; covered with a short 

 close pubescence ; antennae and tarsi reddish ; two and 

 three quarters lines ; banks of the Wandle, Surrey ; and 

 banks of the Trent. Notts. PI. 37, fig. 3. 



Family [30]. Elmid^e. Shuck. 



Genus [281]. Elmis. Latr. Eleven species. 



E. Volkmari, Panz. Entirely bronzy black; one and a 

 half line; beneath stones in rapid streams. PI. 37,fiff- 4. 



Genus [282]. Georyssus. Latr. One species. 



G. pygmseus, Fab. Deep black and shining; head de- 

 flexed ; the punctures of the striae of the elytra very 

 coarse ; three quarters of a line ; muddy banks of oozing 

 springs. PI. 37, Jiff. 5. 



Tribe II. PALPICORNES. Latr. 



Family [31]. SpERCHEiDiE. Shuck. 



Genus [283]. Spercheus. Fab. One species. 



S. emarginatus, Fab. Obscure testaceous ; opaque ; elytra 

 with dispersed dusky spots ; antennae and legs testaceous ; 

 three and a half lines ; roots of aquatic plants in stagnant 

 waters. PI. 37, jiff. 6. 



Family [32]. Helophorid.e. Leach. 



Genus [284]. Helophorus. Illix/. Eleven species? 



H. grandis, Illig. Griseous, loosely sprinkled with dusky 

 spots ; the channels of the thorax cupreous ; antenna?, 

 palpi and legs testaceous ; about three lines ; in ponds, 

 very common. PL 38, fig. 1. 

 Genus [285]. Hydrochus. Germ. Three species. 



H. elongatus, Fab. Entirely of a shining bronzy black ; 

 antennae and legs pitchy ; two lines ; ponds and ditches. 

 PI. SS, jiff. 2. 

 Genus [286]. Enicocerus. Stephens. Three species ? 



E. viridiaeneus, Steph. Greenish brassy, shining ; antennae, 

 palpi and legs pitchy ; about a line and a half; under 

 stones in streams. PI. 38, fig. 3. 



