4920 Insects. 



find it in the ditches of Battersea Fields, which were, thirty years 

 back, one of the finest localities for insects of all orders in the neigh- 

 bourhood of London. 



PjELObius, Schon. 



4. P. Hermanni, Fab. I do not find any localities of this fine 

 species recorded by Mr. Clark. I have generally found it in ponds in 

 Epping Forest and on Hampstead Heath, the beginning of April and 

 again in August ; it also occurs on Wandsworth Common, preferring 

 clay-pits into which the leaves of trees fall in the autumn ; it used 

 also to be taken in Copenhagen Fields, on the spot which is now 

 transformed into the Cattle Market. 



Hyphidrus, III. 



5. H. variegatus of Stephens is merely a common variety of 

 H. ovatus, as indicated by Mr. Clark. The FT. variegatus of Illiger is 

 a very distinct species, only inhabiting the South of Europe and 

 Northern Africa. 



Hygrotus, Steph. 

 When I gave the characters of this group in 1835, I expressed 

 a doubt of the necessity of separating it generically from Hydroporus, 

 and this opinion prevails on the Continent. As, however, the labrum 

 and labial palpi are very different, at least in H. inaequalis, if these 

 differences extend to the other species, they might very advan- 

 tageously form a section of the genus Hydroporus. 



6. H. bisulcatus, Curt. Ann. Nat. Hist. v. 5, p. 276. Of this 

 curious little beetle I have a coloured drawing, and it was described 

 by me in the 'Annals,' in June, 1840. " It was taken on Cambridge 

 Fens by the Rev. J. L. Brown." 



7. H. decoratus, Gyll., Curt. Brit. Ent. pi. 531. This species stood 

 for a long time unique in the British Museum. In July, 1834, it was 

 found in abundance, and given to me by Mr. G. A. Wright, who met 

 with it " on Askham Bog, near Tadcaster, in shallow puddles on the 

 overflowed part of the Bog, where the grass was very thick : in these 

 places water-insects of every description abounded, and the H. de- 

 coratus seemed exclusively confined to them," vide Brit. Ent. fol. 531. 



Hydroporus, Clairv. 



8. H. Davisii, Curt. Brit. Ent. pi. 343. This distinct species was 

 one of the many rare water-beetles first introduced to British Ento- 



