792 On Aquatic Carnivorous Coleoptera or Dytiscidoe. 



1357. Hydroporus cyprius, Regt., Aim. Soc. Fr. 1877, p. 352. Cjrprus. 



" H. discreto Fairni., viciiius, sed minus conve.\us, multo magis elongatus, oralis, liaiul parallelus, 

 antice et postice magis attenuatus, in prothorace elytrisque plus minusve pubescens ; niger, vertice 

 obscure ferrugineo; elytrorum lateribus et basi saepe vage fuscescentibus, epipleuris nigris; infra 

 valdo profundeque, supra dense nee tani profunde punctatus ; pedibus totis rufo-ferrugLneis ; antennis 

 sat crassis, ad basin testaceis, postea fusco-uigricantibus ; protliorace ante basin sulco transverse obsolete 

 et utrinque fovea lata impresso. Long. 3^ — 3^ m.m." 



" Cette esp^ce appartient au gi-oupe nombreux et diiBcile des Hydroporus noirs. 11 est voisin de I'H. 

 discretus, Fairm. ; mais il est moLnsconvexe, bea\icoup plus allonge, regulierement ovale, non parallele etpar 

 suite bien plus attennu6 en avant et en arrifere. II est entirfement noir et plus on moins pubes- 

 cent sur le corselet et les elytres ; le sommet de la tete est marque d'une tache transversale d'un 

 ferrugineux sombre, les elytres ont souvent a la base et sur les cotes une teinte vaguement brunatre ; 

 toutes les pattes sont d'un roux ferrugineux, les antennes un peu epaisses, testacies a la base, noiratres 

 dans les deux demiers tiers. Tout le dessous du corps est convert de gros points enfonc6s tres-marqu6s ; 

 tout le dessus est ponctue assez finement et densement, sur tout sur le corselet, qui est presque rugeux, 

 et qui en outre presente, en avant de la base un sillon en forme d'accolade, termine de chaque cote par 

 une fossette rugueuse et bi6n marquee ; les deux lignes de points enfonces des Elytres sont bien apparentes, 

 tandis qu'elles sont a peine indiqules chez le discretus." 



1358. Hydroporus decemsignatus, Clk., Ann. Nat Hist 1862, p. 176. Mexico. 



" Ovalis, ad apicem attenuatus, punctato-striatus, niger ; elytris flavo decemnotatis ; antennis testaceis ; 

 pedibus fuscis. Long. corp. 2 lin., lat 1 lin." 



" Broadly ovate, compressed and attenuated towards the apex, punctate-striate, of a duU black colour ] 

 head broad, impunctate, with two insulated depressions, one on either side of the inner margin of the 

 eyes, in colour black, the basal line and also the apex being obscurely tinged with rufous : thorax broad, 

 the lateral margin lieing much constricted towards the front, and in a continuous line with the lateral 

 margin of the head ; the surface (under a high power) is obsoletely rugose ; parallel with the anterior 

 margin is a line of faintly impressed punctures ; in colovir black, with a medial circular spot of suffused 

 rufous (in a second example there is a distinct trace of a similar suffused rufous marking near the 

 margin) : elytra broad, attenuated towards the apex, with three lines of faintly impressed punctures — 

 one near the suture, another medial, and a third at some distance from the lateral margin ; the surface 

 is of a dull black colour, with five markings of flavous on each elytron — one at the base, transverse and 

 parallel to the margin (sometimes continued at the shoulders in a line parallel to the lateral margin) ; 

 the four others are smaller, of equal size, in form either subcircular or somewhat quadrate ; of these, 

 two are near the lateral margin, one is situate at the apex, and a fourth medially near the suture ; 

 abdomen and underside fusco-rufous, sometimes almost black : antennas testaceous : legs the anterior 

 rufo-testaceous, the posterior fusco-rufous." 



I think this may prove to be a colour variety of H. roffi, Clk. (No. 1424). — D. S. 



1359. Hydroporus delectus, Woll., Cat. Col. Can. 1864, p. 76. Canary Islands. 



" H. oblongus, minute punctulatus, tenuiter pubescens, niger prothorace ad latera dilute testaceo et 

 oblique subrecto ; elytris utrinque lineis tribus latis interruptis testaceis, postice valde abbreviatis, ornatis ; 

 antennis ad basin pedibusque piceo- testaceis. Long, coi-p. lin 1 — IJr. Very closely allied to the European 

 Hydroporus flavipes, but I think, nevertheless, really distinct. . . . Rarissimus." 



1360. Hydroporus depressicollis, Rosenh., Thier. Andal., p. 50. Spain. 



" Ovalis, depressus, rufo-piceus, opacus, densissime punctatus, tenuissime pubescens ; prothorace 

 deplanato, lateribus parum rotundato et sub-elevato, elytris medio longitudinaliter deplanatis, sutura 

 costisque tribus elevatis, duabus exterioribus obsoletis. Long. 1 j lin., lat. 1 lin." 



