358 On Aquatic Carniworous Coleoptera or Dytiscide. 
elytra. The Chinese specimens are smaller and paler and less variegated in their 
marks than those I have seen from Japan, but I have no doubt all are one 
species. 
Japan, China, (Kiu Kiang, Mr. Geo. Lewis). 65. 
287 Hydroporus orientalis, Clk., M.C.—Oblongo-ovalis, subopacus, rufo- 
testaceus, elytris fuscis, testaceo-signatis, crebre, subtiliter, sub-obsolete punctatis 
distincteque pubescentibus. Long. 1%, lat. 1 m.m. 
The elytra have a pale lateral border, which behind the base is greatly dilated 
and extends inwardly nearly to the suture, it is also broader and more projecting 
inwards at the apex, and again at an intermediate spot. 
The male differs from the female by having the front and middle tarsi moderately 
dilated. ‘ 
The species is extremely similar to a variety of Bidessus striola, (No. 279), which 
has the elytra similarly marked, but that species has the under surface more 
obscurely coloured. 
Siam, (Bangkok, Castlenau). 104. 
288. Bidessus transversus, n. sp.—Oblongo-ovalis, rufo-testaceus, nitidus, elytris 
fuscis, testaceo-signatis, sat crebre, minus subtiliter punctatis, sparsim subtiliter 
pubescentibus, stria suturali basin versus obsoleta. ; coxis posterioribus medio sparsim 
distincte punctatis. Long. 1%, lat. 1 m.m. 
The pale marks on the elytra consist of a narrow lateral margin, with a broad 
patch extending inwardly behind the base, and a much narrower process behind the 
middle, the terminal portion of which is abruptly turned forwards. 
The only individual I have seen is I think a male, if so the front and middle tarsi 
are only slightly dilated. 
Siam, (Bangkok). 105. 
289. Hydroporus intermixtus, Walk. (?), M.C.—Oblongo-ovalis, sub-brevis, sat 
nitidus, tenuissime pubescens, capite, thorace, antennis pedibusque testaceis, elytris 
sordide testaceis, sutura infuscata ; pectore fusco-testaceo, abdomine nigricante ; 
elytris minus dense obsolete punctatis ; corpore subtus fere impunctato. Long. 14, 
lat. 1 m.m. 
This species is closely allied to Bidessus striola (No. 279), but is much shorter 
and has the elytra more sparingly punctured. I have seen three individuals. 
Sumatra, (sent by Wehncke). 455. 
