328 On Aquatic Carnivorous Coleoptera or Dytiscida. 
simple. ‘The species is also closely allied to H. sordidus (No. 197), but is a good 
deal narrower, and the antenne are not so slender. 
Madagascar, (fide Wehncke). 153. 
199. Hydrovatus elevatus, n. sp.,—Subrotundatus, convexus, ferrugineus, nitidus, 
crebre subtiliter punctatus, in elytris obsolete reticulatus ; antennis brevibus simpli- 
cibus, coxis posterioribus sat fortiter sed minus crebre punctatis, nitidulis. Long. 
23, lat. 1§m.m. 
I have seen only three individuals, which show me no sexual differences ; the 
antennee are short and rather slender, the joints from four to ten being about as 
long as broad. The species is a little longer than Hyphydrus cuspidatus (No. 180) 
and a little more convex, the punctuation is less deep, and the anterior tibie 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 subineequaliter 
punctatis. Long. 23, lat. 14 m.m. 
Rather smaller than Hyphydrus cuspidatus, (No. 180) especially narrower and 
more parallel, darker in colour, more shining, more finely punctured; the coxe 
much more sparingly punctured; the antenne rather shorter and a good deal 
thinner. The species is excessively close to H. sumatrensis, (No. 195) but isa 
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 
punetatis, prothorace basi subtiliter punctato, coxis parce punctatis. Long. 23%, lat. 
12 m.m. 
Mas, antennis elongatis, articulis intermediis latioribus, unguiculis anterioribus 
elongatis. 
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 antenne 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 antenne 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, 
