380 On Aquatic Carnivorous Coleoptera or Dytiscide. 
346. Hyphydrus impressus, Klug, M.C.—Parvus, ovalis, valde convexus, brevis 
piceus, capite thoracisque lateribus ferrugineis ; elytris lateribus basique testaceo 
signatis, confertim, fortiter, eequaliterque punctatis, stria longitudinali nulla ; 
antennis pedibusque testaceis ; capite medio late impresso. Long. 33, lat. 23 m.m. 
This species is peculiar, and in its form approaches Dytiscus ineequalis, (No. 381), 
the margin of the clypeus is very distinct and definite, and on the middle of the 
head is a broad impression, which is very finely and minutely punctured so as to 
be dull. The legs are slender. I am unable to discover any external sexual 
characters. 
Madagascar. 37. 
347. Dytiscus ovatus, Linn., Hyphydrus ovatus, M.C.—Ovalis, convexus, latus, 
ferrugineus, elytris obscurioribus basi et marginibus lateralibus indistincte testaceo 
signatis. 
Mas, major, dense fortiter, irregulariter punctatus, supra nitidus, pedibus quatuor 
anterioribus crassiusculis, tarsis bene dilatatis, subdeplanatis. Long. 5, lat.. 
3% m.m. 
Fem., minor, obsoletius punctata, opaca, pedibus quatuor anterioribus gracilibus 
tarsis lateraliter compressis. Long. 43, lat. vix. 3 m.m. 
Var.? Paulo latior et magis subtiliter punctatus, prothoracis lateribus sub- 
rotundatis, elytrorum epipleuris ad basin latioribus. 
I have seen only a single male of this variety, should it prove to be a distinct 
species I would call it Hyphydrus sanctus. The sexual characters seem to be exactly 
similar to those of Dytiscus ovatus. It is from Jerusalem. 
This species is one of the common water beetles of Central Europe, and is found in Sweden, and 
rarely in the extreme south of Scotland. In Castlenau’s collection there is a large male of the species 
indicated as found in the Island of Pulo Penang. 38. 
348. Hyphydrus variegatus, Aubé, M.C.—Ovalis, convexus, latus, subtus ferru- 
gineus et opacus, capite ferrugineo vertice infuscato, thorace ferrugineo, basi infus- 
eato, elytris fuscis, transversim angulariter testaceo-signatis. Long. 42, lat. 3 m.m. 
Mas, supra sat nitidus, dense, fortiter, sat irregulariter punctatus, pedibus 
quatuor anterioribus mediocriter crassis. 
Fem., vix minor, opaca obsolete punctata, thorace anterius medio foveolato, 
pedibus sat gracilibus. 
In this species the traces of a sutural stria on the elytra are more strongly 
marked than in any other of the allies. 
Southern Europe, and North Africa; South of France, Spain, Tangiers, and formerly found at 
Vienna. 39. . 
