On Aquatic Carnivorous Coleopicra or Dijtiscida;, 429 



angulis posterioribus haud rotundatis ; elytris haud omnino opacis, apice evidenter 

 sinuatis obsolete denticulatis. 



Fern., thorace basi utriiique fortiter rotundato, angulis posterioribus rotundato- 

 obtusis ; elytris omnino opacis, apice fortiter denticulatis. 



Readily distinguished from H. insignis, by the darker colour and the deep sutural 

 stria; M. de Borre's remarks (Ann. Belg., Vol. WY, p. XlII), as to H. insignis 

 Klug, are not really drawn from that species but from the male of the present one. 



Sinai. 254. 



476. Deronectes seriatus, n. sp. — Ovalis, haud latus, convesus, sine pubescentia, 

 opacus, niger, densissime subtilissimeque punctatus, elytris vix ad basin et ultra 

 medium conspicue sanguineo-signatis, serie suturali punctorum impressorum pro- 

 funda ; antennis fuscis. Long. 4f, lut.2| m.m. 



Mas, tarsis anterioribus et intermediis leviter dilatatis, unguiculis a^qualibus ; 

 antennis longioribus, articulis intermediis paulo crassioribus. 



Although allied by its sculpture to Deronectes princeps, this species is very dis- 

 tinct by the small sexual disparity, as well as by its smaller size and comparatively 

 narrower form : the denticulation near the apex of the elytra is not very conspicuous 

 and is similar in the two sexes ; the thorax has, besides the basal and apical 

 punctures, some distant conspicuous punctures on the middle, and there is a very 

 short but rather deep central puncture on the middle. The elytra besides the 

 sutural series of punctures, have two other much more obsolete discoidal series. 

 The red marks on the elytra can sometimes be scarcely detected. 



Arabia, (Hedjaz, MOlingen). 1145. 



477. Hydroporus crotchi, de Borre, Ann. Soc. Belg. XiV, p. XIlI. — (p)Ovalis, 

 convexus, subtilissime pubescens, opacus, niger, antennis tarsisque quatuor anteri- 

 oribus rufescentibus, elytris vage rufo-variegatis, serie suturali punctorum impres- 

 sorum profunda ; corpore omnium subtilissime punctulato ; prothoracis angulis 

 posterioribus nullo modo rotundatis ; elytris apicem versus denticulo acuto fortiter 

 prominulo. Long. 6 m.m., lat. 3^^ m.m. 



The only individual I have is M. de Borre's type example ; it is a female, and 

 very similar to the corresponding sex of Deronectes princeps, but is readily dis- 

 tinguished from it by the very distinctly defined hind angles of the thorax. 



Sinai. 255. 



478. Deronectes arabicus, n. sp. — Ovalis, subtilissime pubescens, subtus nio-er 

 antennis pedibus capite thoraceque rufescentibus, elytris pallide testace's 



3K s 



