276 On Aquatic Carnivorous Coleoptera or Dytisciche. 



pone medium rufo-testaceis ; pedibus rufis, posteriorlbus magis obscuris ; antennis 

 testaceis. Long. 3h, lat. 2 m.m. 



The yellow colour at the sides of the thorax is here very broad ; the spot at the 

 shoulder of the elytra is also large, and between it and the suture there are obscure 

 traces of another basal spot, the spot behind the middle is rather small. 



Persia. 488. 



57. Hydrocanthus morsbachi, Wehncke, Berl. Zeit. 1S76, p. 222. — Ovalis, sat 

 convexus, posterius attenuatus, pernitidus, nigei-, capite anterius anguste, prothorace 

 ad angulos anteriores, elytris niaculis duabus ad basin, aliaque transversa pone 

 medium rufo-testaceis ; antennis testaceis, pedibus rufis, posteriorlbus obscurioribus. 

 Long. 3 m.m., lat. l§m.m. 



The yellow colour on the head and at the anterior angle of the thorax is very 

 small in extent, on the other hand the two basal spots on the elytra are rather 

 laro-e, and the post-medial spot is broad, so as to form a transverse mark. I have 

 seen but one individual. 



Cochin China, ("Wehncke). G13 



58. Canthydrus frontalis, n. sp. — Ovalis, sat convexus, posterius attenuatus, 

 pernitidus, niger, capite anterius, prothorace ad angulos anteriores, elytris maculis 

 duabus magnis ad basin fasciaque pone medium rufo-testaceis ; antennis testaceis, 

 pedibus rufis, posteriorlbus obscurioribus. Long. 2|, lat. 11 m.m. 



In this species the limit between the colours on the head is angular : the marks 

 on the elytra are a longitudinal oblong one at the shoulder, a rather large spot 

 between that and the suture, and a transverse spot or short band beyond the middle. 



Arabia ; Bombay. 487. 



59. Canthydrus sexpunctatus, n. sp. — Ovalis, sat convexus, posterius attenuatus, 

 pernitidus, niger, capite anterius rufo, prothorace ad angulos anteriores, elytrisque 

 maculis sex testaceis, pedibus rufis, posteriorlbus obscurioribus : antennis testaceis. 

 Long. 21, lat. It m.m. 



The smaller extent of the yellow colour on the thorax seems to be almost all that 

 distinguishes this species from Hydrocanthus luctuosus (No, 60). 



India ; Tranquebar. 486. 



60. Hydrocanthus luctuosu.s, Aube, M.C. — Ovalis, sat convexus, posterius attenua- 

 tus, pernitidus, niger, capite et prothoracis lateribus rufo-testaceis, illo vertice magis 



