On Aquatic Carnivorous Coleoptera or Dytiscidte. 323 



This species is extremely similar to the small dark varieties of Hyphvdrus 

 cuspidatus (No. 180), but is rather narrower, and the front tarsi in both the sexes 

 are more slender, and the basal joints of the front and middle tarsi are less dilated 

 in the male ; the female seems to be nearly as shining as the male. The spotting 

 of the elytra is more indistinct than in Hyphydrus cuspidatus. 



Europe. Corsica, M. Damry, Elmas, Sardinia, 9. 5. 73, Gestro. Malaga. 1.52. 



184. Hydro vatus longicornis, n. sp. — Brevissimus, sed posterius conspicue 

 attenuatus et acuminatus, ferrugineus, elytris crebre fortiter punctatis ; clypeo vix 

 perspicue emarginato. Long. 2l m.m., lat. !§ m.m. 



Mas, antennis perelongatis, articulis 5-7 latioribus, clypeo utrinque sinuato. 



Fern., antennis sat elongatis, tenuibus, simplicibus. 



The species has no trace of spots on the elytra ; the male will be readily distin- 

 guished by its very long antenna?, with the middle joints dilated. In the female 

 the antennte are very much shorter than in the male, but still they are elongate, 

 each joint being longer than broad. 



About the size of Hydrovatus clypealis (No. 179), but very distinct by the form 

 of the front of the head as well as by the elongate antennae ; the coxae 

 are wider than in H. clypealis and are more sparingly punctured, and their intra- 

 rimal portions arc more depressed, so that a greater approximation of the base of 

 the trochanters is possible ; the legs are longer and more slender than in H. clypealis, 

 but the general structure of the undersurface except in these points is very similar. 



Egypt, (Dr. C. Millingeu). 3 



185. Hydrovatus pictulus, n. sp. — Latus, brevissimus, convexus, nitidus, 

 ferrugineus, supra fusculus, elytris evidenter rufo-signatis ; thorace crebre, elytris 

 sparsim punctatis. Long. 2i, lat. 2 m.m. 



Scarcely longer than Hyphydrus cuspidatus (No. ISO), but a good deal broader, 

 and so with the sides more curved, and easily distinguished from the other species 

 by the very distinct red markings on the elytra. The antennae are very short, and 

 rather stout, the joints being rather compressed, and transverse. The mare"in of 

 the clypeus is quite distinct and is most evident in the middle, this part being 

 rather produced and truncate. The under side is very similar to H. cuspidatus but 

 the coxte are not quite so closely punctured. 



Madagascar, (coll. Bonvouloir, and Bi-ussels Museum, under the name of Hydroporus fasciatus 

 Chev.) 4. 



186. Hydroporus pustulatus, Melsh., Oxynoptilus cuspidatus, M.C. — Brevissimus, 

 latus, convexus, alutaceus, fere opacus, ferrugineus, supra rufo-testaceus, prothorace 



TRAN9. ROT. DUB. SOC, N.S., VOL. II. 2 O 



