On Aquatic Carnivorous Coleoptera or Dytiscide. 359 
290. Bidessus fuscipennis, n. sp.—Oblongo-ovalis, angustulus, rufo-testaceus, sat 
nitidus, elytris abdominisque lateribus infuscatis ; elytris fortiter sat crebre punctatis, 
stria suturali profunda; coxis posterioribus medio sparsim, obsolete punctatis. 
Long. 2, lat. § m.m. 
The pubescence on the elytra of this species, though scanty is rather long, and 
distinct ; the elytra have no defined marks, 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. 114. 
991. Bidessus denticulatus, n. sp.—Oblongo-ovalis, elongatus, sub-opacus, rufo- 
testaceus, elytris nigro-signatis, cum thorace dense zequaliter sat subtiliter punctatis ; 
coxis posterioribus subtiliter sed perspicue punctatis. Long. 3, lat. 1} 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, 24, lat. 1$ 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 coxz are sparing, and 
extremely obsolete. 
The male has the front and middle tarsi rather strongly dilated ; the female I 
have not seen. 
China, (Kiu Kiang, Mr. Geo. Lewis). 103. 
(B. no sutural stria on wing cases). 
993. Hydroporus amabilis, Clk., M.C.—Oblongo-ovalis, levigatus, pernitidus, 
fuscus, pedibus testaceis, capite thoraceque sepe rufo-testaceis; elytris fusco- 
testaceis, versus suturam distincte punctatis, humeris et lateribus levigatis ; 
thorace basin versus fere paulo latiore. Long. 3%, lat. 12 m.m. 
