278 On Aquatic Carnivorous Coleoptera or Dytiscida. 
65, Canthydrus proximus, n. sp.—Ovalis, sat latus, posterius attenuatus, convexus, 
pernitidus, niger, capite thoraceque minus leete rufis, hoc macula magna anteriori 
basique transversim nigris, elytris maculis duabus pone basin, aliaque pone medium 
transversis rufis ; antennis testaceis, pedibus quatuor anterioribus rufis, posterioribus 
piceis. Long. 3, lat. 13 m.m. 
This species is very closely allied to Canthydrus nitidulus, but is not so broad 
and is more obscurely coloured. 
Siam, (Bangkok). 483. 
66. 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, maculis duabus pone basin, aliaque transversa 
recta pone medium testaceis ; subtus abdomine, pectoris prosternique medio 
nigricantibus, lateribus rufis ; antennis testaceis, pedibus rufis, tarsis tiblisque 
posterioribus piceis. Long. 33, lat. 1$ m.m. 
Northern China, (Kiu Kiang, G. Lewis); Formosa. 482. 
67. 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 irregulari, et fascia transversa mediali angulata ad suturam 
latius interrupta testaceis ; abdomine plus minusve nigricante: tarsis posterioribus 
piceis. Long. 23, lat. 12 m.m. 
Closely allied to Hydrocanthus haagi (No. 68), but larger and more elongate, 
and with slight differences in the colour and markings, 
Siam, (Bangkok) ; Celebes, (Macassar, Beccari). 481. 
68. Hydrocanthus kaagi, 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. 13 m.m. 
This species 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. Soc. Lond. 1873, p. 51.—Ovalis, posterius 
