On Aquatic Carnivorous Coleoptera or Dytiscidce. 359 



290. Bidessus fuscipennis, n. sp. — Oblongo-ovalis, angustulus, rufo-testaceu^, sat 

 nitidus, elytris abdominisque lateribus infuscatis ; elytris fortiter sat crebre punctatis, 

 stria suturali profunda ; coxis posterioribus medio sparsim, obsolete punctatis. 

 Long. 2, lat. I m.m. 



The pubescence on the elytra of this species, though scanty is rather long, and 

 distinct ; the elytra have no defined mai'ks, but the sides just behind the shoulders 

 are rather paler, and behind this rather darker than elsewhere. 



I do not know the sex of the only individual I have seen. 



Siam. lU. 



291. Bidessus denticulatus, n. sp. — Oblongo-ovalis, elongatus, sub-opacus, rufo- 

 testaceus, elytris nigro-signatis, cum thorace dense (Bqualiter sat subtiliter punctatis ; 

 coxis posterioribus subtiliter sed perspicue punctatis. Long. 3, lat. IJ m.m, 



I have seen but two individuals of this very distinct species, and I have no doubt 

 they are male and female^ though the characters that distinguish them are very 

 slight, the male tarsi being only slightly broader than those of the female. The 

 prosternal process is broad, the stria on the thorax is minute, and the elytra are 

 denticulate near the extremity. 



Australia, (Rockhampton). 97. 



292. Bidessus flammulatus, n. sp. — Oblongo-ovalis, angustulus, capite, thorace, 

 antennis pedibusque testaceis, thorace basi medio infuscato, pectore, abdomine 

 elytrisque fuscis, his pone basin, lateribus apiceque testaceo-signatis, crebre, 

 subtiliter, sub-obsolete punctatis, distincte pubescentibus. Long. 2i, lat. \\ m.m. 



The pale markings of the elytra consist of a waved and angulated fascia behind 

 the base, which extends somewhat backwards along the sides, of an apical mark, 

 and of a lateral mark between these. The punctures of the coxae are sparing, and 

 extremely obsolete. 



The male has the front and middle tarsi rather strongly dilated ; the female I 

 have not seen. 



China, (Kin Kiang, Mr. Geo. Lewis). ] 03. 



(B. no sutural stria on wing cases). 



293. Hydroporus amabilis, Clk., M.C. — Oblongo-ovalis, lasvigatus, pernitidus, 

 fuscus, pedibus testaceis, cajiite thoraceque ssepe rufo-testaceis ; elytris fusco- 

 testaceis, versus suturam distincte punctatis, humeris et lateribus Itevigatis ; 

 thorace basin versus fere paulo latiore. Long. 3i, lat. \\ m.m. 



