On Aquatic Carnivorous Coleoptera or Dytiscide. 429 
angulis posterioribus haud rotundatis ; elytris haud omnino opacis, apice evidenter 
sinuatis obsolete denticulatis. 
Fem., thorace basi utrinque 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. A\IV, p. XIII), 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, convexus, 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. 44, lat.23 m.m. 
Mas, tarsis anterioribus et intermediis leviter dilatatis, unguiculis «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, Millingen). 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. 35 m.m. 
The only individual I have is M. de Vorre’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 niger, 
antennis pedibus capite thoraceque rufescentibus, elytris pallide testace’s, 
383K 2 
