10 



their base and the legs fulvous ; l£ line ; coasts, Lanca- 

 shire. PI. 12, fig. 3. 



TRIBE II. HYDRADEPHAGA. Macleay. 



Eace I. EUNECHINA. Kirb. and Sp. 



Family [8j. Dytiscid^e. Leach. 



Subfamily I. HALIPLITES. Shuckard. 



Group I. HALIPLINI. Erichson. 



Genus [86]. Haliplus. Latr. Differs from Cnemidotus, by 

 the terminal joint of palpi being subulated, and the plate of 

 the coxse leaving three segments of the venter exposed. Fif- 

 teen species. 



H. ferruginous, Lin. Entirely ferruginous-red ; the legs 



slightly paler; 2 — 2J lines; ditches and ponds, common. 



PI. 12, fig. 4. 



Genus [87]. Cnemidotus. Illig. Differs from Haliplus, by 



the terminal joint of palpi being conic acute, and the plate of 



the coxae leaving only one segment of the venter exposed. 



One species. 



C. csesus, Dnft. Yellow-testaceous ; the elytra -with suc- 

 cessive rows of black punctures, which decrease in size to 

 the apex ; legs fulvous ; about two lines ; ponds and 

 ditches. PI. 12, fig. 5. 



Group II. PELOBINI. Erichson. 



Genus [88]. Peloeius. Schon. One species. 



P. Hermanni, Fab. Fulvous ; thorax with the base and 

 apex, and the elytra with a large black irregular common 

 patch on the disk, red; legs testaceous; five lines; ponds 

 and ditches. PI 12, fig. 6. 



Subfamily II. DYTISCITES. Erichson. 



Group I. HYDROPORINI. Erichson. 



Genus [89]. Hyphvdrus. Illig. One species. 



H. ovatus, Lin. Pale ferruginous ; the elytra more obscure; 

 two lines; ponds and ditches, common. PI. 12, fig. 7. 



