328 On Aquatic Carnivorous Coleoptera or Dytiscida. 



simple. 'Hie species is also closely allied to H. sordidus (No. 197), but is a good 

 deal narrower, and the antennae are not so slender. 



Madagascar, (fide Wekncke). 153. 



199. Hydrovatus elevatus, n. sp., — Subrotundatus, convexus, ferruginous, nitidus, 

 crebre subtiliter punctatus, in elytris obsolete reticulatus ; antennis brevibus simpli- 

 cibus, coxis posterioribus sat fortiter sed minus crebre punctatis, nitidulis. Long. 

 21, lat. Ism.m. 



I have seen only three individuals, which show me no sexual differences ; the 

 antennae are short and rather slender, the joints from four to ten being about as 

 long as broad. The species is a little longer than Uyphydrus cuspidatus (No. ISO) 

 and a little more convex, the punctuation is less deep, and the anterior tibiae are 

 slightly broader. 



Celebes, (Macassar, Jan., 1874, Beccari). 449. 



200. Hydrovatus tinctus, n. sp. — Sat latus, nitidus, ferrugineus, supra fusco- 

 castaneus, subtiliter vix crebre punctatus ; antennis tenuibus simplicibus ; elytris 

 ad apicem sub-obtusis ; coxis posterioribus fortiter sed minus crebre subinaequaliter 

 punctatis. Long. 2^, lat. \\ m.m. 



Rather smaller than Hyphydrus cuspidatus, (No. 1 SO) especially narrower and 

 more parallel, darker in colour, more shining, more finely punctured; the coxae 

 much more sparingly punctured ; the antennae rather shorter and a good deal 

 thinner. The species is excessively close to H. sumatrensis, (No. 195) but is a 

 good deal smaller, and has the punctuation of the elytra more obsolete. 



Siam, (Bangkok). 9. 



201. Hydrovatus cribratus, n. sp. — Ferrugineus, latus, elytris fortiter crebriusque 

 punctatis, prothorace basi subtiliter punctato, coxis parce punctatis. Long. 21, lat. 

 li m.m. 



Mas, antennis elongatis, articulis intermediis latioribus, unguiculis anterioribus 

 elongitis. 



Fem., antennis tenuibus, simplicibus, sat elongatis. 



Clypeus very distinctly margined, especially in the male, in which sex it is 

 scarcely rounded, but is very slightly emarginate on each side. The antennae in 

 the male are rather stout, and the intermediate joints, especially the sixth and 

 seventh, are a good deal thicker than the others ; in the female the antennae are 

 very slender. The punctuation of the elytra is close and very distinct. 



This species is closely allied to Hydrovatus longicornis, (No. 184) but is narrower. 



