DYTICIDiE. HYDRO TOR US. 53 



Oblong-ovate, beneath black, above rusty-testaceous, glossy, coarsely and deeply 

 punctate : head with a bilobate dusky-black posterior margin : thorax punc- 

 tulate, with its anterior margin dusky, its posterior blackish; within the latter 

 a transverse series of deep impressions ; elytra very deeply punctate, dusky, 

 with the suture and four parallel lines on each, black, and a short streak of 

 the same colour on the margin towards the apex; at the base are six deeply 

 punctated striae, and a slighter one on each side of the suture : legs bright rufo- 

 ferruginous : antenna? testaceous, annulated with black towards the apex. 



More abundant than the three preceding species, but neverthe- 

 less somewhat uncommon; found occasionally near London, in 

 Norfolk, Devonshire, and near Swansea. " Southend, rare, and 

 Netley, Salop."— Rev. F. W. Hope. 



-f Sp. 9. alternans. Oblongo-ovaius, subtus niger, supra ferrugineus, opacus, 

 subtiliter punctatus, capitis maculis duabus, thoracis macula ad basin trans- 

 versa, elytrorumque lineis nigris, striis 4 baseos coleopterorum punctatis obso- 

 letis. (Long. corp. 2^ lin.) 



Hy. alternans. Kunze. — Steph. Catal. p. 45. No. 447. 



Oblong-ovate, beneath black, above ferruginous, opaque, very finely punctu- 

 lated; head with two black spots: thorax with a transverse black spot on 

 the hinder margin: elytra dusky, with the suture and four parallel lines 

 black, finely punctate, with four obsoletely punctate striae at the bass : legs 

 ferruginous. 



In the British Museum. " Taken in Ulswater Lake." — Dr. 

 Leach. 



Sp. 10. dorsalis. Oblongo-ovatus, niger, pubescens, thoracis mar gine fascia que 

 tnterruptd, elytrorum puncto baseo, margineque incequaliter ferrugineis. (Long, 

 corp. 2 — 2§ lin.) 



Dy. dorsalis. Fabricius. — Hy. dorsalis. Steph. Catal. p. 45. No. 448. 



Black, pubescent, thickly punctulate and pubescent : head rufo-ferruginous, with 

 a deep impression on each side in front : thorax transversely convex in the 

 middle, black, the sides broadly ferruginous, sometimes with an interrupted 

 fascia behind the middle : elytra moderately convex, black, the lateral margin 

 more or less ferruginous, with a spot at the base, and a streak towards the 

 apex of the same colour ; towards the scutellum, at the base of the elytra, is 

 also a spot, differing in size, of a deeper hue, which is occasionally deficient : 

 body pitchy-ferruginous beneath, with the apex obscure, entirely punctu- 

 lated : legs and base of the antennae ferruginous; the apex of the latter dusky. 



Var. /s. Steph. Catal. 1. c. Elytra with the lateral margins alone slightly fer- 

 ruginous. 



Var. y. Thorax with a round ferruginous spot within the margin, a similar one 

 near the base of the elytra, and the margin of the latter ferruginous. 



The size and shape of the ma dilations vary considerably. Not 



