DYTICIDyE. — HYDROPORUS. 57 



I have a pair of this species, which I captured in a ditch near the 

 junction of the Surrey and Croydon Canals. 



h. With the elytra not truncate at the apex. 



Sp. 19. Scalesianus. Rufo-ferrugineus, elytris saturatioribus, punctulatis, subtus 

 niger ; antennis pedibusque rufo-testaceis. (Long. corp. £ lin.) 



Hy. Scalesianus mild. Steph. Catal. p. 46. No. 457. 



Minute, rufo-ferruginous : head with an impression on each side in front: 

 thorax with the disc slightly elevated transversely, the posterior margin thickly 

 punctulated : elytra deep-ferruginous, inclining to castaneous, the outer mar- 

 gin palest, finely and rather thickly punctulate throughout: body glossy- 

 black beneath, thickly and rather strongly punctate : legs and antennae rufo- 

 testaceous, the latter palest. 



Of this insect I have as yet seen but a pair, which were captured 

 by the late R. Scales, Esq., in Norfolk, who kindly supplied me 

 with one of the specimens, and to whom I dedicated the species 

 long since. 



Sp. 20. unistriatus. Ovatus, niger, thorace fascia pallida striolisque duabus 

 coleoptris communibus, elytris plagd obsoletd rufescente. (Long. corp. f — 1 

 lin.) 



Dy. unistriatus. Illiger. — Hyd. unistriatus. Steph. Catal. p. 46. No. 458. 



Minute : ovate, black, punctulated : head pitchy-brown, scarcely punctulated : 

 thorax transversely testaceous in the middle, the anterior and posterior mar- 

 gins dusky, with an oblique impressed line on each side at the base : elytra 

 ovate, much attenuated posteriorly, above convex, rather deeply punctulate, 

 pitchy-black, with an undefined, obsolete, rufescent patch on each, near the 

 shoulder ■ in the middle of the base an abbreviated, deeply-impressed striola, 

 in continuity with the one on the base of the thorax ; and, parallel with the 

 suture, a rather faint stria, scarcely reaching to the apex : body pitchy-black 

 beneath, deeply punctate: legs ferruginous; tarsi obscure: antennae ferru- 

 ginous at the base, black towards the tip. 



Not very abundant in the neighbourhood of London ; more fre- 

 quent in Devonshire. " Kensington-gardens." — Rev. F. W. Hope. 



Sp. 21. geminus. Oblongo-ovatus, niger, thorace fascia pallidd striolisque duabus 

 imjjressis in elytris continuatis, coleoptris fascia dentatd margineque pallidis. 

 (Long. corp. 1 — 1 J lin.) 



Dy. geminus. Fabricius. — Hyd. geminus. Steph. Catal. p. 46. No. 459. 



Minute, oblong-ovate, black : head piceous : thorax pale- testaceous, shining, 

 finely punctulated, the anterior margin dusky in the middle, the posterior 

 with a large transverse dusky-black patch, terminating on each side in an 

 oblique, deeply-impressed striola, which is carried on to the base of the elytra; 

 the latter are finely punctulated, glossy-black, with an irregular pale fascia 

 before the middle, a semi-ovate spot behind the middle, and a triangular one, 



