380 On Aquatic Carnivorous Coleoptera or DytiscidiB. 



346. Hyphydrus impressus, Klug, M.C. — Parvus, ovalis, valde convexus, bievis 

 piceus, capite thoracisque laterlbus ferrugineis ; elytris lateribus basique testaceo 

 signatis, confertim, fortiter, sequaliterque punctatis, stria longitudinal! nulla ; 

 an tennis pedibusque testaceis ; capite medio late impresso. Long. 3^, lat. 23 m.m. 



This species is peculiar, and in its form approaches Dytiscus inajqualis, (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. T am unable to discover any external sexual 

 characters. 



Madagascar. 37. 



347. Dytiscus ovatus, Linn., Ihjphydrus ovatus, M.C. — Ovalis, convexus, latus, 

 ferrugineus, elj'tris obscurioribus basi et marginibus lateralibus indistiucte testaceo 

 signatis. 



Mas, major, dense fortiter, irregulariter punctatus, supra nitidus, pedibus quatuor 

 anterioribus crassiusculis, tarsis bene dilatatis, subdeplanatis. Long. 5, lat. 

 3i m.m. 



Fern., minor, obsoletius punctata, opaca, pedibus quatuor anterioribus gracilibus 

 tarsis lateraliter compressis. Long. 4j, 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, Aube, M.C. — Ovalis, convexus, latus, subtus ferru- 

 ginous et opacus, capite ferrugineo vertice infuscato, thorace ferrugineo, basi infus- 

 cato, elytris fuscis, transversim angulariter testaceo-signatis. Long. 4i, lat. 3 m.m. 



Mas, supra sat nitidus, dense, fortiter, sat irregulariter punctatus, pedibus 

 quatuor anterioribus mediocriter crassis. 



Fern., 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, Spair>, Tangiers, and formerly found at 

 "Vienna. 39. 



