Mr. T. V. Wollaston on new British species of Coleoptera. 453 



Section PHILHYDRIDA. 

 Fam. AnisotomidjE, Stephens. 

 Genus Ephistemus, Westwood. 



2. Ephistemus palustris. Niger, nitidus, subpubescens, thorace in- 

 terdum piceo, antennis pedibusque testaceis. PI. IX. fig. 2. 

 Corp. long. lin. T 7 ^. Oblong-ovate, very convex, pitchy-black, 



shining, minutely and sparingly punctured, most obscurely pu- 

 bescent. Thorax large and sometimes piceous. Legs pale tes- 

 taceous. Antennse somewhat darker, thick, with the club robust. 

 I possess three specimens of this very distinct species (which 

 is at once recognised from the rest by its larger size) taken, each 

 on different occasions, in the marshes near Cambridge. Con- 

 cluding it therefore to be a fen insect, I have selected the specific 

 name "palustris " as most appropriate. 



Section HYDRADEPHAGA. 



Fam. Dyticidjs, Leach. 

 Genus Hydroporus, Clairville. 



3. Hydroporus trifasciatus. Capite fusco-ferrugineo, thorace fer- 

 rugineo basi nigra lateribus rotundatis, elytris pallido-ferrugineis, 

 fasciis tribus sutura apiceque nigris, corpore subtus piceo, antennis 

 pedibusque pallidis. PI. IX. fig. 3. 



Corp. long. lin. f . Somewhat linear-oblong, glabrous, thickly 

 and minutely punctured. Under side piceous. Eyes black. Head 

 dusky-ferrugineous. Thorax convex, with the sides rounded, 

 broader than the elytra and slightly widest in front, ferrugineous 

 with the extreme hinder margin black ; a short, deep fovea on 

 each side at the base, approximating anteriorly. Elytra depressed, 

 with a sutural stria continuing more than half the length of the 

 suture from the base, and a very deep one on the disc (in con- 

 tinuity with the fovea on the thorax) extending to the middle of 

 the elytron and tending slightly inwards posteriorly, — pale-fer- 

 rugineous with the suture and three fasciae black, — the first being 

 at the base, the second (of a zigzag form, somewhat in the shape 

 of the letter M) a little behind the middle, and the third towards 

 the apex. Legs pale-ferrugineous. Antennae slightly darker, 

 except the basal joints which are pale. 



This most minute and very interesting Hydroporus was cap- 

 tured in Ireland by my friend W. Clear, Esq., in the river Lee 

 near Cork, and to him I am indebted for three specimens from 

 which the above description was drawn. 



