On Aquatic Carnivorous Coleoptera or Dytiscide. 323 
' This species is extremely similar to the small dark varieties of Hyphydrus 
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. 152, 
184. Hydrovatus longicornis, n. sp.—Brevissimus, sed posterius conspicue 
attenuatus et acuminatus, ferrugineus, elytris crebre fortiter punctatis; clypeo vix 
perspicue emarginato. Long. 23 m.m., lat. 13 m.m. 
Mas, antennis perelongatis, articulis 5-7 latioribus, clypeo utrinque sinuato. 
Fem., 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 antenne, with the middle joints dilated. In the female 
the antennz 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 bead as well as by the elongate antenne; the cox 
are wider than in H. clypealis and are more sparingly punctured, and their intra- 
rimal portions are 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. Millingen). 3 
185. Hydrovatus pictulus, n. sp.—Latus, brevissimus, convexus, nitidus, 
ferrugineus, supra fusculus, elytris evidenter rufo-signatis ; thorace czebre, elytris 
sparsim punctatis. Long. 22, lat. 2 m.m. 
Scarcely longer than Hyphydrus cuspidatus (No. 180), 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 antenns are very short, and 
rather stout, the joints being rather compressed, and transverse. The margin 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 
ihe coxee are not quite so closely punctured. 
Madagascar, (coll, Bonyouloir, and Brussels Museum, under the name of Hydroporus fasciatus 
Chey.) 4. 
186. Hydroporus pustulatus, Melsh., Oxynoptilus cuspidatus, M.C_—Brevissimus, 
latus, convexus, alutaceus, fere opacus, ferrugineus, supra rufo-testaceus, prothorace 
TRANS. ROY. DUB. SOC., N.S., VOL. II. 28, 
