4922 Insects. 



Noterus, Claim. 



18. N. sparsus, Marsh., Curt. Brit.Ent. pi. 236, and the difference 

 between the two species are there carefully considered : in addition to 

 the localities there given I may add another, — a pond at Newtown, 

 Isle of Wight, where I took N. sparsus, on the 1st of July. 



Colymbetes, Clairv. 



14. C. consobrinus, Curt. Brit. Ent. pi. 207. This is said to be 

 the D. Cicur of Fabricius, a native of the Cape of Good Hope: it 

 was introduced into my work, in consequence of Dr. Leach and 

 Mr. Wilkin having purchased of Tuther, a dealer in Natural History, 

 specimens which he assured them were taken near Wanstead House, 

 Essex. The individual described and figured by me is in the 

 cabinet of the Zoological Society, and Mr. Tuther received three 

 guineas for that specimen ! 



15. C. Grapii, Gyll. This finely-sculptured insect I first dis- 

 covered in ditches at Drayton, near Norwich, and at Horning, in 

 May, 1810: it was at first confounded with C. bipustulatus, Linn., 

 and at that time entomologists were very loth to admit that they were 

 distinct, until the difference of sculpture in the elytra was made 

 manifest by a drawing which I possess, — a singular proof how much 

 better Entomology is understood and the species investigated at the 

 present time than it was forty years back. 



Hydaticus, Leach. 



16. H. cinereus, Linn., Curt. Brit. Ent. pi. 95. The four species 

 inhabiting Britain are very local, and one of them (H. stagnalis) is so 

 rare that I have never been able to obtain a native example of it: 

 whether the neighbourhood of Exeter and Netley will ever again 

 furnish specimens I think very doubtful, and Wiltshire, it must be 

 admitted, is a very ambiguous habitat. The other species are taken 

 at Whittlesea Mere in June and July. 



Dytiscus, Linn. 



As a proof of the importance of attending to the structure of 

 the under side of the Dytiscidae, not only in reference to generic 

 characters, but in support of specific distinctions, I would call 

 attention to the form of the furcate lobes of the metasternum in 

 this genus, as exhibited in plate 99 of ' British Entomology,' to show 



