On Aquatic Carnivorous Coleoptera or Dytiscrde. 789 
“ Cette espice, trés voisine du Hydrop. lituratus, Fab., pourrait, 4 la vue simple, étre confondue avec 
elle, mais, 4 la loupe, on voit que sa ponctuation beaucoup moins forte est aussi beaucoup plus dense et 
qu’elle est méme presque imperceptible.” 
1345. Hydroporus bifasciatus, Macl., Trans. N. S. W., 1871, p. 121. Australia (Gayndah), 
“Tength, 2 lines. Ovate, subconvex, covered with a close punctuation, and of a testaceous red colour. 
Head bordered in front, 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 
fascie 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, 8. 
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 ; alongitudinal honey-yellow line, more dilated before ; antenne yellowish, 
dusky at tip; thorax with a submarginal honey-yellow band before having three processes, one in the 
middle, and one, rather more dilated, on the lateral margin, not reaching the posterior edge ; elytra with 
avery 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 equinoctialis, Clk. (No. 525.)—D. 8. 
1347. Hydroporus boristhenicus, Hoch., Bull. Mose., XLIV, p. 233. Europe. 
“Tiong. 24-24 lin. Diese art hat ihre nachsten Verwandten an H. 12 pustulatus und H. depressus, 
Fab., &c., &c. Von allen diessen unterschiedet ihn sogleich bei fliichtiger Vergleichung, die linglichere, 
von der Mitte nach vorn etwas, nach hinten stark verjiingte form, die hoher gewolbten Fliigeldecken, 
und das auf den Seiten starker abgerundete Halsschild, mit breitem schwarzem Saume am Vorderrande. 
Die Zeichnung der Fliigeldecken, zwar #hnlich den beiden Erstgenannten, ist jedoch auch wieder sehr 
VOESENIEEM, 9 6 6 6 6 oF 
«¢Tm Mai Monat im Dneper haiitig.” 
I think this will prove to be a variety of Dytiscus depressus (No. 472).—D. 8. 
1348. Hydroporus caliginosus, Lec., Agass., Lake Sup., p. 215. North America. 
“ Ovalis, minus convexus, niger nitidus, minus subtiliter punctatus, sparseque pubescens, thorace lateri- 
bus obliquis vix rotundatis, disco obsoletius punctato ; elytris basi vix conspicue angustatis, apice oblique 
-attenuatis: antennis palpis pedibusque rufis. Long. -12.” 
“More convex than the following (H. tartaricus), less parallel and more acute behind: the punctures 
of the clytra are much larger and more distant.” 
512 
