112 MANDIBULATA. COLEOPTERA. 



thorax more or less coppery or brassy, the lateral margins rounded, the disc 

 with five longitudinal sulci, as in the foregoing species : elytra oblong, slightly 

 convex, the back dusky-aeneous, the margins griseous, rather deeply punctate- 

 striated, the interstices narrow, convex, without an abbreviated stria on the 

 second, towards the scutellum : body beneath black, pubescent ; legs, palpi, 

 and antennae pale testaceous, the latter dusky at the tip. 

 This also varies greatly in size : the elytra are sometimes griseous, clouded with 

 dusky, and tinged with brassy, or nearly immaculate : the thorax also varies 

 considerably in tint, being occasionally fuscous or dusky-brass. 



Very abundant in stagnant waters, not only in the metropolitan 

 district, but elsewhere. 



Sp. 3. griseus. Oblongior, thorace viridi-cupreo nitido, lateribus suhrectis, 

 elytris pallidis fusco-nehulosis. (Long. corp. 1^ — if lin.) 



El. griseus. Illiger.—'H.e. griseus. Steph. Catah p. 57. JVo. 570. 



Narrower and longer than the preceding ; of a glossy cinereous : head shining 

 cupreous green: thorax short, rather convex, the sides nearly straight and 

 oblique, the disc with five sulci, generally of a shining green, with the sulci 

 cupreous, and the anterior and lateral margins pale : elytra elongate, punctate- 

 striated, the interstices flat, smooth, pale griseous, with several sprinkled fus- 

 cous spots: body beneath black: legs, palpi, and antenna? entirely pale- 

 flavescent. 



Far from uncommon in stagnant ponds and ditches throughout 

 the metropolitan district. " Paddington." — Rev. F. W. Hope. 



Sp. 4. dorsalis. Plate XIV. f. 1. — Fuscus, thorace viridi, lateribus subrectis, 

 elytris punctato-striatis, testaceis, nigro-nebulosis. (Long. corp. l| — 2 lin.) 



Hy. dorsalis. Marsham. — He. dorsalis. Steph. Catal. p. 57. JVo. 571. 



Rather ovate, shining fuscous ; head as in He. stagnalis : thorax green, with the 

 sides nearly straight, the disc with five sulci, the second from the margin on 

 either side curved outwardly, the rest nearly straight, the central one rather 

 deepest : elytra rather broad, punctate-striated, the interstices slightly elevated, 

 smooth; the disc testaceous, with a large common dusky-black patch, in 

 which are two testaceous spots placed towards the apex : antennae, palpi, and 

 legs pale : body dusky beneath. 



Not common : taken occasionally near London ; also at Hertford, 

 near Ripley; in Norfolk, Devonshire, &c. 



Sp. 5. viridicollis. Fusco-ameus , nitidus, thorace viridi-aneo, lateribus suhrotun- 

 datis, elytris ameo-nigris, prof unde punctato-striatis. (Long. corp. if lin.) 



He. viridicollis. Kirby MSS.—Steph. Catal. p. 57. No. 572. 



Short and broad, shining brassy-brown : head finely punctulate : thorax sub- 

 quadrate, with the sides somewhat rounded, the disc greenish-brass, with five 

 irregular sulci : elytra deep immaculate brassy-black, rather deeply punctate- 



