On Aquatic Carnivorous Coleoptera or DytiscidcB. 7S9 



" Cette espece, tres voisine du Hydrop. lituratus, Fab., pourrait, a la viie simple, etre confondue avec 

 elle, mais, a la loupe, on voit que sa ponotuation beaucoup moins forte est aussi beaucoup plus dense et 

 qu'elle est m6me presque imperceptible." 



1345. Hydroporus bifasciatus, Macl., Trans. N. S. W., 1871, p. 121. Australia (Gayndah). 



" Length, 2 lines. Ovate, subconvex, covered with a close punctuation, and of a testaceous red colour. 

 Head bordered in fi'ont, and with a very short, oblique, lightly-impressed line at the inner and anterior 

 angle of the eyes. Thorax broad, short, narrowly margined on the sides, and broader behind than in 

 front, with the anterior angles advanced, the posterior subacute, the base slightly bisinuate on each side, 

 and a large patch of a dark brown colour on each side of the central lobe. Elytra broader than the 

 thorax, rounded at the humeral angles and on the sides, and narrowed and rounded at the apex, with a 

 very zigzag, black fascia about the middle, extending from the suture to near the sides, and another of 

 the same hue, and rather broader near the apex, extending from the sides almost to the suture, the two 

 fasciae being joined near the suture, and nearly joined about the middle of the width. On each elytron 

 may be traced an obsolete stria a little way from the suture, and also a number of small, round, obsolete- 

 looking depressions. The tarsi of the males are black and much dilated, the third joint being the largest." 



This description appears quite applicable to Hyphydrus australis (No. 358), and I expect the name will 

 prove a synonym thereof.— D. S. 



1346. Hydroporus bifidus. Say, Tr. Am. Phil. Soc. IV, p. 444. Mexico (in a small river beyond Vera 

 Cruz). 



" Elytra with a subsutural, impressed, punctured stria. Body, black ; head with much dilated 

 indentations between the eyes ; a longitudinal honey- yellow line, more dilated before ; antennse yellowish, 

 dusky at tip ; thorax with a submarginal honey-yellow band before having three prooe.sses, one in the 

 middle, and one, rather more dUated, on the lateral margin, not reaching the posterior edge ; elytra with 

 a very distinct, punctured, impressed, subsutural stria, and about two other hardly obvious ones near 

 the middle ; bifid yellowish lines at base near the tip ; feet, dark honey-yellow. Length less than one-fifth 

 of an inch." 



This is perhaps near Hydroporus sequinoctialis, Clk. (No. 525.) — D. S. 



1347. Hydroporus boristhenicus, Hoch., Bull. Mosc, XLIV, p. 233. Europe. 



" Long. 2^2^ lin. Diese art hat ihre nachsten Verwandten an H. 12 pustulatus und H. depressus, 

 Fab., (fee, etc. Von alien diessen unterschiedet ihn sogleich bei fliich tiger Vergleichung, die liinglichere, 

 von der Mitte nach vorn etwas, nach hinten stark verjungte form, cUe hoher gewolbten Elugeldecken, 

 und das auf den Seiten starker abgerundete Halsschild, mit breitem schwarzem Saume am Vorderrande. 

 Die Zeichnung der Fliigeldecken, zwar iihnlich den beiden Erstgenannten, ist jedoch auch wieder sehr 

 verschieden " 



" Im Mai Monat im Dneper haiifig." 



I think this will prove to be a variety of Dytiscus dejoressua (No. 472). — D. S. 



1348. Hydroporus caliginosus, Lee, Agass., Lake Sup., p. 215. North America. 



" Ovalis, minus convexus, niger nitidus, minus subtiliter punctatus, sparseque pubescens, thorace lateri- 

 biis obliquis vix rotundatis, disco obsoletius punctato ; elytris basi vix conspicue angustatis, apice oblique 

 attenuatis : antennis palpis pedibusque I'ufis. Long. "12." 



" More convex than the following (H. tartaricus), less parallel and more acute behind : the punctures 

 of the elytra are much larger and more distant." 



513 



