DYTICID.E. — HYDKOPORUS. 51 



Sp. 2. areolatus. Oblong0-ovatus,subdepressus,pallidus,thoracenigro bipunctato, 

 etytris pallido nigroque lineatis. (Long. corp. l| lin.) 



Dy. areolatus. Buftschmid. — Hyg. areolatus. Steph. Catal. p. 45. No. 440. 



Oblong-ovate, rather depressed, beneath pitchy-black, above pale, slightly 

 pubescent ; the thorax rounded anteriorly, the sides margined, with an im- 

 pression towards the base, the latter with two black spots : elytra with the 

 suture and several irregular lines on the disc black : legs and antennse fer- 

 ruginous. 



Var. /S. With the body beneath rusty-testaceous. 



" In the north of England."— Dr. Leach. " In running streams, 

 Bottisham." — Rev. L. Jenyns. " Netley and Tradesley, Salop, 

 rare."— Rev. F. W. Hope. 



Sp. 3. depressus. Oblongo-ovatus ,subdepressus,ferrugineus,thorace macula baseos 

 geminti elytrorumque suturd, lineisque disci irregularibus. Long. corp. l| — 2 

 lin.) 



Dy. depressus. Fabricius.-B.jd. depressus. Steph. Catal. p. 45. No. 441. 



Oblong-ovate, slightly depressed, pale ferruginous, finely punctulate and slightly 

 pubescent : head large, rather dusky on the posterior margin : thorax a little 

 convex on the disc, the anterior and posterior margins with a very narrow 

 black edge, the latter with two small angulated, or rounded, spots : elytra a 

 little convex, pale testaceous, the suture, and several irregular lines on the 

 disc, black, leaving an unequal margin of a pale hue, and two dorsal spots on 

 each elytron, the latter placed one behind the other ; the tip of the elytra is 

 obliquely truncate, the outer angle having a powerful dentation: legs and 

 antennae pale ferruginous. The form of the lines and spots on the elytra varies 

 considerably ; in some specimens the former are sometimes confluent. 



" Brooks near Oxford." — Rev. F. W. Hope. " River Avon, 

 Salisbury, in July."" — Mr. Ingpen. " In running streams, Bottis- 

 ham, in company with the last." — Rev. L. Jenyns. 



b. Elytra not dentate at the apex. 



Sp. 4. duodecim-punctatus. Oblongo-ovatus, pallidtferrugineus, thoracis later ibus 

 roiundatis, basi maculd bilobd nigra, elytris nigris, maculis sex ferrugineis. 

 (Long. corp. 2| — 3^ lin.) 



Dy. 12-punctatus. Fabricius. — Don. xiv. pi. 496. — Hyd. 12-punctatus. Steph. 

 Catal. p. 45. No. 442. 



The largest of this genus; of a pale ferruginous, obsoletely strigulated: head, 

 with the region of the eyes, and its posterior margin, dusky : thorax, with 

 the lateral margins, rounded anteriorly; the anterior with a broad black border 

 in the middle, and the posterior also with a black edge, which is anteriorly 

 produced into two lobes in the middle : elytra slightly convex, black, each 

 with six pale spots, three parallel with the suture, and three on the margin : 

 body pale ferruginous beneath : legs and antennae the same. 



E2 



