31 



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



D. Dumerilii, 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. PL 37, Jig. 3. 



Family [30]. Elmid^e. Shuck. 



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



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

 half line ; beneath stones in rapid streams. PL 37, Jig. 4. 

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



G. pygrnaeus, 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. PL 37, Jig. 5. 



Tribe 2. PALPICORNES. Latr. 



Family [31]. Spercheid^e. Shuck. 



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



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

 with dispersed dusky spots ; antennae and legs tes- 

 taceous ; three and a half lines ; roots of aquatic plants 

 in stagnant waters. PL 37, Jig. 6. 



Family [32]. Helophorim:. Leach. 



Genus [284]. Helophorus. lllig. Eleven species? 



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

 spots ; the channels of the thorax cupreous ; antennae, 

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

 very common. PL 38, Jig. 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. 

 PL 38, Jig. 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. PL 38, Jig. 3. 



