358 On Aquatic Carnivorous Coleoptera or DytiscidtB. 



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. \i, 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. 



Siain, (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 postei'ioribus 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. Ij, 

 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. 



