468 COLEOPTEROUS INSECTS FOUND IN 
Gen. Hyppiidrus. 
H. ovatus, Samou. Dytis. ovatus. Linn. Marsh. 
Not common, but has been occasionally met with in the 
lochs and ponds around Edinburgh. Pond, Coates. Loch- 
end. Mr Stephens conceives the H. ovalis, Fab., to be 
the female of this species. 
Gen. Hygrotus. 
H. reticulatus, Steph. Dytis. reticulatus^ Fab. 
Very plentiful, in company with Halipli and Hydroporl 
Pond, Botanic Garden. Ditches at the west end of Dud- 
dingston Loch, &c. &c. 
Gen. Hydropokus. 
H. depressus, KunzL Dytis. elegans, Illig. Marsh. 
This insect occurs in shallow pools by the side of the 
Esk, near Dalkeith, in the month of August. 
H, duodecim-punctatus, iSamow. Steph. Dytis. l^-punc- 
tatus^ Fab. Marsh. 
Near Edinburgh. Sir P. Walker. It is not common. 
H. trivialis, Spence. Steph, 
With the other species, rare. 
H. melanocephalus, Samou. Steph. Dytis. melanocephalus, 
Marsh. 
In shallow pools, seemingly not very common. Ditches 
near Craigcrook. 
H. erythrocephalus, De Jean. Steph. Dytis. erythroce- 
phalus^ Linn. 
An extremely common insect, occurring in every collec- 
tion of water round Edinburgh, and may be found through- 
out the year. 
