278 On Aquatic Carnivorous Colcoptera or Dijtiscidce. 



65. Canthydrus proximus, n. sp. — Ovalis, sat latus, posterius atteniiatus, convexus, 

 pernitidus, niger, capite thoraceque minus la^te rufis, hoc macula magna anteriori 

 basique transversim nigris, elytris maoulis duabus pone basin, aliaque pone medium 

 transversis rufis ; antennis testaceis, pedibus quatuor anterioribus rufis, posterioribus 

 piceis. Long. 3, lat. ll m.m. 



This species is very closely allied to Canthydrus nitidulus, but is not so broad 

 and is more obscurely coloured. 



Siam, (Bangkok). 483. 



G(). Canthydrus nitidulus, n. sp. — Ovalis, robustus, posterius attenuatus, convexus, 

 pernitidus, capite thoraceque rufo-testaceis, hoc basi maculaque in medio anteriori 

 nigris ; elytris fere impunctatis, nigris, maoulis duabus pone basin, aliaque transversa 

 recta pone medium testaceis ; subtus abdomine, pectoris prosternique medio 

 nigricantibus, lateribus rufis ; antennis testaceis, pedibus rufis, tarsis tibiisque 

 posterioribus piceis. Long. 3l, lat. if m.m. 



Northern China, (Kiu Kiang, G. Lewis) ; Formosa. 482. 



G7. Canthydrus flammulatus, n. sp. — Ovalis, posterius attenuatus, convexus, perni- 

 tidus, rufo-testaceus, prothorace basi medio elytrisque nigricantibus, his fere im- 

 punctatis, apice plus minusve dilutioribus, ad basin macula laterali longitudinali 

 aliaque versus suturam in-egulari, et fascia transversa mediali angulata ad suturam 

 latius interrupta testaceis ; abdomine plus minusve nigricante : tarsis posterioribus 

 piceis. Long. 2|, lat. li m.m. 



Closely allied to Hydrocanthus haagi (No. 6S), but larger and more elongate, 

 and with slight difterences in the colour and markings. 



Siaui, (Bangkok) ; Celebes, (Macassar, Beccari). 481. 



GS. Hydrocanthus haagi, Wehncke, Berl. Zeit. 1876, p. 222. — Ovalis, brevis, 

 posterius attenuatus, convexus, pernitidus, rufo-testaceus, prothorace basi medio 

 elytrisque nigris, his impunctatis apice late rufescentibus, macula laterali 

 longitudinali, aliaque transversa versus suturam ad basin, et fascia transversa 

 mediali valde undulata ad suturam augustius interrupta testaceis. Long. 2, 

 lat. Ij m.m. 



This sjDecies is pale beneath ; its small size, and the much waved transverse 

 fascia on the middle of the elytra distinguish it amongst its allies. 



Siam, (Bangkok). 480. 



69. Hydrocanthus politus. Sharp, Tr. Ent. Sec. Loud. 1 873, p. 51. — Ovahs, posterius 



