5052 Insects. 



College, there is a fine series, taken probably about the same date. 

 I should be glad to learn that any of the entomologists of Cambridge 

 had succeeded in re-discovering a locality for it. 



Genus Hydrochus. 



1. H. elongatus, Schal. Taken occasionally near London, and 

 also in the fen districts and other localities, but nowhere abundantly. 



2. H. angustatus, Mull. More common than the preceding. 



3. H. brevis, Herbst. 1 have never met with this insect, which 

 appears to be rare. It is found occasionally in the neighbourhood of 

 London, and also in Norfolk. 



Genus Octhebius. 



I have pleasure in acknowledging the assistance that I have 

 derived, in the examination of this genus, from Mr. Waterhouse's 

 paper, read before the Entomological Society, April, 1853, and pub- 

 lished in Part VII. Vol. ii. of the 'Transactions' of that Society, to 

 which I refer your readers for distinctions between the species. 



1. O. exculptus, Muls. Common on moors in the North of Eng- 

 land. 



2. O. marinus, Pk. Generally distributed along the coast. In 

 Lancashire, below high-water mark, October, 1855; also, by Dr. 

 Power, at Sheerness, April; and Lymington, June, 1854. 



3. O. margipallens, Lat. 1 am indebted to Dr. Power for my only 

 examples, taken by him in mud-pits, Sheerness, April 15, 1854, in 

 profusion ; also single examples at Wandsworth and Sydenham. 



4. O. asneus, Waterh. " Putney Heath, in May," is given as 

 Stephens' locality ; taken at Cowley, near Uxbridge, in tolerable 

 abundance, by Dr. Power ; also, sparingly, at Wandsworth. 



5. O. pygmasus, Fab. Common everywhere. 



6. O. bicolon, Germ. This insect appears to be common through 

 France : in this country it is more rare, though generally distributed. 

 Near London; Norfolk; Suffolk; W.England; Scotland. 



7. O. rufo-marginatus, Steph. Near London, and Netley, are Ste- 

 phens' localities. Birch Wood, July, 1855 ; near Wallington, 

 Northumberland, August, 1855, by Dr. Power. I have never met 

 with this species. 



8. O. aeratus, Sleph. Not uncommon. 



9. O. exaratus, Muls. The only locality for this species, so far as 

 I know, is Gravesend, a ditch between the town and fort, where it 

 was taken very sparingly by G. R. Watcrhouse, Esq. 





