Ceylon Culeoptera, §c. 27 

 22. Hydrous ntfiventris. X. 



H. ovatus, convexus, supra oleaghio-niger, subtus obscure ferrugineus, 

 pedibus dilute piceis, labro aeneo, reliquis oris partibus cum clvpeo test- 

 aceis. Long. corp. 9. lin. 



Palpi maxill. articulis apicem versus abruptius incrassatis, art. So 

 quarto sesqui longiore. Antennae art. 7-8 fortiter perfoliatis, ultimo 

 acuminate Caput antice utrinque punctulorum serie subsemicirculari 

 et ad oculorum marginem iuteriorem impressum. Thorax punctulorum 

 seriebus 4 lateralibus, 2 subapicalibus obliquis abbreviatis signatus. 

 Elytra subtiliter striato-punctata. Tarsi omnes unguibus basi fortiter 

 uni-dentatis. Carina prosternalis cultriformis. 



Specimen singulum f. nocte ad lumen cepi. 



As far as niy resources allow me to ascertain a very anoma- 

 lous species, having the perfoliated antenna? and toothed claws 

 of a Hydrophilus and the cultriform prosternal carina and 

 the elytra of a Hydrous, I have placed it in the latter g. n 

 account of the sharp edge of the prosternal carina, in which 

 the great distinguishing character of this g. seems to lie, the 

 same being deeply grooved in Hydrophilus. The insect at- 

 tracts at once attention by the reddish color of its abdomen. 

 It is of a blackish olive color on the back having however the 

 clvpeus and the anterior margin of the labrum of a yellowish 

 brown, the latter being otherwise of rather a metallic color. 

 The remaining parts of the mouth are more or less yellowish. 

 Joints 1-6 of the antennae are yellowish too with the excep- 

 tion of the 2nd which is dark, joints 7-9 are blackish and 

 pubescent. The legs are of a light pitch color. The lower 

 part of the head is impressed with 2 rather semicircular series 

 of punctures, similar punctures occurring along the internal 

 margin of the eyes. The thorax is marked with 6 series of 

 themandon the elytra they are arranged in lines. The sternal 

 carina is well developed, the prosternal part has a sharp edge, 

 whilst the mesosternal one is obtuse on the back and the 

 metasternal part depressed and slightly grooved, 



