922 [October, 



the last ventral segment is much less evident than in typical aqua- 

 ticus, but this one would expect to accompany the reduction in size. 

 I should be glad to hear from some Entomologist who has found 

 cequalis really at home, and taken several specimens at the same time 

 and place ; so far I have only heard of it as occurring singly here 

 and there, with the exception of six examples (two of which are 

 before me) taken at the same time by Mr. Champion in the New 

 Forest. 



H. arvernicus, Muls. — This is chiefly a northern species, and 

 occurs, for the most part, on the muddy banks of streams in hilly 

 districts. It has recently beeu recorded from Devonshire (cf. Ent. 

 Mo. Mag., xliv, p. 33). My Norfolk record of it is an error founded 

 on a large and strongly marked example of qriseus determined for me 

 many years ago by the late T. P. Dossetor. 



H. brevipalpis, Bedel. — I have found this the most abundant 

 species of the genus wherever I have collected in inland districts in 

 Norfolk and Gloucestershire. 



H. 4>-signatus, Bach. — This has always been an uncommon species 

 to me ; I first met with it in 1890, when I got three specimens out 

 of a deep brick-lined cavity filled with dirty water, in which there 

 was no visible vegetation, in the fowl-yard of a suburban house at 

 Norwich. At Colesborne it occurs more freely, and one can usually 

 get two or three specimens per annum by dredging in vernal swamps 

 on grass land. 



H. viridicollis, Steph. — This abundant and exceedingly variable 

 species is, with a little experience, very easy to recognise. It is dis- 

 tinguished from dorsalis by having the elytra bronze or with a bronze 

 reflection, their interstices usually broader and less convex with the 

 parts uear the scutellum bearing fine scattered punctures, and the 

 thorax broader in proportion to its length with the narrowing behind 

 arcuate throughout. I have seen a very handsome example from 

 Aviemore, in coll. Champion, with blackish-green head and thorax 

 and the elytra entirely sordid yellow. I have a specimen selected 

 from a large gathering made at Colesborne, in which the elytral 

 interstices are only subequal in width to the stria? and very convex. 



H. dorsalis, Marsh. — I his is a strictly submaritime species. 

 Compared with viridicollis the elytra are without bronze reflection, 

 sometimes with pale spots, the interstices narrower and more convex 

 with the fine punctures in single rows throughout, and the thorax 



