344 Dr. David Sharp on some 



Hydrovatus suhtilis, var. 

 Hydrovatus subtilis, Sharp, Dyt., No. 203, p. 329. 



Six specimens procured by Mr. Lewis at Colombo in 

 April agree with the types from Siam, except that the 

 antennae of the male have the intermediate joints more 

 dilated. 



Bidcssus hufo, sp. nov. 



Oblongo-ovalis, latiusculus, testaceus, parum nitidus, crebre 

 punctatus ; elytris fusco-submaculatis. Long. 2 mm. 



Antennae short. Head short and broad, with fine distinct 

 elevated margin in front. Thorax very strongly transverse, indis- 

 tinctly punctate, at the base with a curved plicate impression, 

 which on the elytra is continued as a straight line appearing 

 externally as an elevation ; the punctuation of the elytra is dense 

 and distinct, there is no pubescence, they are of a pallid sordid 

 testaceous colour, with numerous very indistinct small black spots ; 

 the plica at the base of each extends about one-sixth of the length. 

 The under surface is coarsely punctate. 



This is a very distinct species from any other known, 

 and should be placed at the end of Group 1 of the genus. 

 The thorax is peculiar, being impressed along each side 

 parallel with the margin. 



Kandy, in February. Five specimens. 



Bidessus intermixtus. 

 Hydroporus intermixtus, Walker, Ann. & Mag. Nat. 

 Hist. (3), ii., p. 204; Sharp, Dyt., No. 289, 

 p. 358. 



This appears to be rather variable in colour ; some of 

 the individuals possess fuscous marks on the elytra, 

 while in other specimens these can scarcely be detected. 



Dikoya, in February; on the Hadley Estate. Six 

 specimens. 



Bidessus gentilis, sp. nov. 



Ovalis, angustulus, parum nitidus, testaceus ; elytris abdomine- 

 que fuscescentibus, illis vage testaceo-signatis ; stria basali ely- 

 trorum nulla, stria suturali obsoleta, tantum ad apicem bene 

 impressa. Long. 2 mm. 



This species should be placed after B. Jiamnudatus, Slip., with 

 which it agrees in not having a continuation of the thoracic stria 



