78 [April, 



3. D. anglicamis Edwai'ds. — Dodero has seen only four examples of 

 this species : three of them from England, and the fourth from an old 

 collection with a wrong name, and the locality Caucasus, which he has 

 no doubt is wrong. The species will, however, prohablj'' be found in the 

 marshes about Lille ; it is a fen insect, and has, since its original dis- 

 covery, been found by Mr. C. J. C. Pool in the Cambridgeshire fens. 

 It is a thoroughly separate species, though the external resemblance to 

 both anriculatiis and f/riseiis is very great. 



4. 7). luridns Er., Sturm, Ganglbauer.— This species is flatter and 

 shorter than the three preceding, and the outline of the head, seen 

 directly from tlie front, easily distinguishes it from them ; its pre- 

 dominant colour is brownish, not greyish, the shield of the antenna is 

 black or blackish in colour, and the club of the antenna is blunter and 

 shorter than in the two larger, grey forms. 



This is the prolifericornis of most of our collections in this country, 

 where it is one of the most abundant of our aquatic Coleoptera. It 

 occurs all over England and Scotland, and is found in all sorts of 

 waters, running and stagnant. In the New Forest it is in great pro- 

 fusion among the shingle near the edges of the water, and if this be 

 pushed into the stream, the beetle rises, floats, and takes wing from the 

 surface of the water in a charming manner — this, however, I have 

 witnessed only in warm weather. 



5. D. striatellus Fairm. {aJgiriGiis Ganglbauer). — This is very close 

 to D. luridun, but is rather smaller and blacker, and tliough it has a 

 greyish sheen when fresh it never exhibits the brown colour of D. luri- 

 ihts. The antennae are shorter than in Inridus. The aedeagus is more 

 slender, and its apical part comparatively more elongate. The species 

 usually has the striation of the elytra more distinct, but this character 

 is a very variable one in the genus, and should not be much relied on. 



T>. s/riaiellus is abundant in the New Forest and at Woking, but I 

 have not seen it from any locality north of the Thames. Dodero gives four 

 French localities only for sfriatfllus. D. ahjiric.vs is another species. 



G. Z>. nifidnlvs Heer, Sturm, (langlbauer. — Easily distinguished 

 fi'om D. ernesti by the more approximate antennae. I have seen but 

 few British examples and .they vary so much that I think it possible 

 tliere may be more than one species among them. Dodero gives localities 

 in France, Italy, and Auotria for the species, as well as Freshfield in 

 Lancashire. His figure of the aedeagus does not agree satisfactorilv 

 with our British examples, and a further study of our forms is desirable. 



