56 MANDIBULATA. — COLEOPTERA. 



Sp. 16. rufifrons. Ovatus, subconvexus, piceo-niger, nitidus, profundi punctatus, 

 capite antice, elytrorum margine pedibusque ferrugineis. (Long. corp. 2 lin.) 

 Dy. rufifrons. Duftschmid. — Hyd. rufifrons. Steph. Catal. p. 46. JVo. 454. 



Ovate, subconvex, shining, pitchy-black, deeply punctate: the head finely 

 punctate, anteriorly ferruginous : thorax unequal, the margins thickly punc- 

 tate, the disc rather elevated, slightly punctate; the lateral margin faintly 

 rufescent : elytra very glossy, thickly punctate; the base and lateral margins 

 more or less ferruginous, and the colour more or less distinct: body beneath 

 glossy black, thickly and deeply punctate : legs deep ferruginous : antennae 

 the same, with the terminal joints belted with dusky. 



I have hitherto only met with this insect in the neighbourhood 

 of London. " Wandsworth-common." — Mr. Ingpen. " Netley, 

 Salop:'— Rev. F. IV. Hope. 



Sp. 17. marginatus. Obhngo-ovatus, piceo-niger, pubescens ; capite, thoracis 



lateribus pedibusque, ferrugineis. (Long. corp. 2 lin.) 

 Hyd. marginatus. Kunze. Steph. Catal. p. 46. No. 455. 



Oblong-ovate, pitchy-black, pubescent : head shining, ferruginous, with a dusky 

 spot on each side near the eyes ; sometimes confluent, and two impressed dots 

 between: thorax a little convex, unequal, anteriorly and posteriorly im- 

 pressed transversely, black, punctate, the lateral margins ferruginous : elytra 

 oblong-ovate, slightly convex, finely and thickly punctate, slightly pubescent, 

 rusty-black, with the margins paler at the base : body beneath glossy rusty- 

 black, subpunctate: legs and antennae ferruginous, the latter dusky at the 

 apex. 



Gyllenhal's insect appears, from his description, to be of a deeper hue : I have 

 hitherto seen three or four indigenous specimens only, all of which are of a 

 rufescent or rusty-black. 



Once taken by myself near London. I have a second example, 

 but am not aware of its locality. " Ulswater Lake, twice captured. 1 * 

 Dr. Leach. 



Sp. 18. deplanatus. Ovatus, planus, piceo-niger, opacus, suhtilissime puncfu- 

 latus, tenue pubescens, capite antice, thoracis lateribus, elytrorum basi mar- 

 gineque pedibusque ferrugineis. (Long. corp. 2 lin.) 



Hyp. deplanatus. Gyllenhal. — Hyd. deplanatus. Steph. Catal. p. 46. JVo. 456. 



Ovate, flat, pitchy-black, opaque, slightly pubescent, finely punctate ; head ante- 

 riorly ferruginous, with a dusky curved line near each eye: thorax very 

 short, the base deeply sinuated ; above depressed, black, opaque, the lateral 

 margin obscure, ferruginous : elytra slightly convex, nearly flat, pitchy-black, 

 opaque, finely punctulate, and slightly pubescent ; the shoulders, more or less,, 

 and the lateral margins, beyond the middle, ferruginous : body beneath pitchy- 

 black, rather glossy, obscurely punctate : legs and antennse ferruginous, the 

 latter with the tips dusky. 



