The insects of this genus inhabit ditches and ponds, they are 
to be found basking in the sun upon aquatic plants, walking 
by the water’s edge, frequently upon the surface, and sometimes 
floating on their backs : they are also met with flying, both 
in the heat of the day and in the evening. The transverse 
thorax and shorter anterior legs will at once distinguish our 
genus from Hydrochus, and the large terminal joint of the 
palpi will readily separate it from Ochthebius. The following 
are British species : 
1. E. aquaticusL. — Panz. 26.6. — grandis///. — stagnalis Mars. 
409. 23. 
Found everywhere, the year round, in stagnant ponds and 
ditches. 
2. E. granularis L. — aquaticus F. — flavipes Oliv. 3. No. 38. 
pi. \. f. 3. var. 
In stagnant water everywhere. 
2 a . E. griseus 111 . — minutus Oliv. 3. No. 38. pl.l.f. 6. — affinis 
Mars. 409. 24. 
Near London and Hertford, in Surrey, Devon and Nor- 
folk. 
3. E. dorsalis Mars. 410. 25.Ste.pl . 14./ 1. 
Taken with the last and is probably only a variety. 
4. E. viridicollis Kirb. — Ste. 2. 112. 
In Suffolk and near London. 
5. E. tuberculatus Gyl. 1. 129. 4. 
In the spring, near Southend, Essex. 
6. E. fennicus Paylc. — Curt. Brit. Ent. pi. 466. 
Ochreous, head and thorax coarsely punctured, the former 
with a V shaped impression on the crown, and a castaneous 
spot before each eye, the latter castaneous, with a broad mar- 
gin, a deep channel down the centre and one on each side, 
leaving several rounded protuberances : elytra ovate, with 4 
elevated longitudinal lines on each, and an abbreviated one on 
each side of the scutellum, with double rows of strong punc- 
tures between them ; the base is clouded with brown, as well 
as an indistinct band before the middle and a transverse oval 
mark towards the apex ; there are also a few black spots across 
the centre. 
This, which is not a common species, has never been figured 
in any work. It occurs in July in Battersea Fields, on damp 
banks and hedges, also at Leith-hill, Ealing, Dover, in Nor- 
folk, &c. 
7- E. nubilus Oliv. 3. 38. pi. 1./ 2. 
April, under stones, on banks, and damp sandy places 
everywhere. 
The Plant is Ruppia maritima (Tassel Pond-weed). 
