37 <l On Aquatic Carnivorous Coleoptera or DytiscidcB. 



336. Hyphydrus pictus, Klug, M.C. — Ovalis, sat latus, nitidus, feiTUgineus, supra 

 rufo-testaceus, prothorace medio infuscato, elytris nigro-signatis ; thorace crebre for- 

 titer punctate ; elytris insequaliter punctatis, punctis majoribus sat magnis, minoribus 

 ad basin et ad latera obsoletis apicem versus distinctis, stria discoidali distincta. 

 Long. 43, lat. 3 m.m. <?. 



Mas, trochanteribus anterioribus profunde incisis, incisurje margine externo tenui, 

 subhamato ; abdominis segmento apicali elongato profunde transversim impresso, 

 apice prolongate, incrassato et truncato ; tibiis et tarsis anterioribus leviter 

 dilatatis. 



Fern., paulo minor et magis subtiliter punctata, thoracis angulis posterioribus 

 magis acutis, trochanteribus simplicibus, abdominis segmento apicali ante apicem 

 transver.sim impresso, apice obtuse rotundato. 



This species appears to be variable in punctuation and colour ; the punctuation 

 on the wing-cases is often much effaced, and the black markings are sometimes very 

 indistinct. 



I think King's description may apply to this species ; it is not however very 

 characteristic, and I may be mistaken in my interpretation of it. 



Egypt, Sinai, Arabia. 29. 



337. Hyphydrus africanus, n. sp — Ovalis, latus, nitidus, convexus, ferrugineus, 

 supra rufo-testaceus, prothorace medio infuscato, elytris nigro-signatis ; thorace 

 crebre fortiter punctato, elytris crebre, sat fortiter, vi.x insequaliter punctatis, punctis 

 majoribus minus conspicuis, minoribus ad basin subtilioribus ; stria discoidali ad basin 

 sat distincta. 



Mas, trochanteribus anterioribus incisis, incisurse margine externo crasso ; 

 abdominis segmento apicali vix impresso, apice tuberculato ; tibiis anterioribus 

 dilatatis. Long. 4i, lat. 3 m.m. 



Fern., minor, paulo magis subtiliter punctata, trochanteribus et abdomine muticis. 

 Long. 4, lat 2f m.m. 



Very closely allied to Hyphydrus pictus, but broader and more convex, the 

 punctuation more distinct, and the front tibiae of the male much broader, the apical 

 segment of the hind body less developed in the male. 



Senegal. 30. 



338. Hyphydrus crassus, "Woll. Col. Hesp. p. 33. — Ovalis, sat convexus et latus, 

 cnbre, fortiter, vix insequaliter punctatus, piceus, capite, thoracis laieribus angustius, 

 elytrisque rufo-testaceis, his nigro-signatis, stria discoidali ad basin sat distincta. 

 Long, c? 42, lat. 3 m.m. 



Mas, trochanteribus anterioribus incisurse parvse margine externo crasso, abdom- 



