Ochthebius is readily distinguished from Hydrochus on the 
one side, by the slender terminal joint of the maxillary palpi, 
and from Hydraena on the other, by the inferior length of 
those palpi, which in Hydraena are longer than the antennae. 
In dissecting this minute insect, the labium and its palpi were 
slightly injured ; and it is necessary to state that the 3rd and 
4th joints of the antennae may be obsolete in some of the spe- 
cies, and were very indistinct in the one dissected. 
The Ochthebii are found in ponds and ditches in April, 
May, and June, and on the shores of the sea and rivers. 
1. O. aeratus Step . — Taken near London. 
2. nanus Step. — Taken in the New Forest by Mr. D. 
Bydder. 
3. rufimarginatus Step . — Near London. 
4. bicolon Kirby MSS. — Germ. p. 92.— Near London and 
in Scotland? 
5. pygmaeus Fab., Gyll., AJir. ? 8. 7. — riparia III. — im- 
pressus Marsh. ? — Near London, in Norfolk and 
Cambridgeshire. 
6. marinus PayJc., Gyll. — margipallens Lat. ? — On the 
shore of the Humber near Hull. 
7. dilatatus leach MSS. — Near London, in Norfolk, Dor- 
setshire, Devon, &c. The authentic specimens in the 
British Museum have a subdiaphanous spot on each 
side the thorax, at the posterior angles, as in O. hy- 
bernicus. 
8. hybernicus Curtis Brit . Ent. pi. 250. 
For specimens of this fine species I am indebted to A. H. 
Haliday, Esq. who took them the end of last March upon 
rushes on the shore of the Bay of Belfast after the tide had 
retired. From all the foregoing species it is distinguished by 
the irregular punctation of the elytra, &c. and from the fol- 
lowing by its inferior size, the remarkable somewhat diapha- 
nous spots at the posterior angles of the thorax, and by the 
long white hairs which are scattered over the insect. 
9. O. punctatus Step . 
The plant is Lysimachia vulgaris (Yellow Loosestrife.) 
