186 Descriptions ofneiv Ceylon Coleoptera. [no. 2, new series, 



The femora, the last joint of themaxill. palpi, the mandibles and 

 the tarsal joints are dark towards the apex. The last abdominal 

 segment of the f. is furnished with a bifid hairy appendage. 

 28. Hydrous rufiventris. N. 



H. ovatus, convexus, supra oleagino-niger, subtus obscure fer- 

 rugineus, pedibus dilute piceis, labro eeneo, reliquis oris partibus 

 cum clypeo testaceis. Long. corp. g. lin. 



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

 3° quarto sesqui longiore. Antennae art. 7-8 fortiter perfoliatis, 

 ultimo acuminato. Caput antice utrinque punctulorum serie subse- 

 micirculari et ad oculorum marginem interiorem impressum. Tho- 

 rax punctulorum seriebus 4 lateralibus, 2 subapicalibus obliquis 

 abbreviatis signatus. Elytra subtiliter striato punctata. Tarsi 

 omnes unguibus basi fortiter unidentatis. Carina prosternalis 

 cultriformis. 



Specimen singulum f. nocte ad lumen cepi. 



As far as my resources allow me to ascertain a very anomalous 

 species having the perfoliated antennae 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. on account of the 

 sharp edge of the prosternal carina, in which the great distinguish- 

 ing character of this g. seems to lie, the same being deeply groov- 

 ed in Hydrophilus. 



The insect at once attracts attention by the reddish color of its 

 abdomen. It is of a blackish olive color on the back, having how- 

 ever the clypeus and the anterior margin of the labrum of a yel- 

 lowish brown, the latter being otherwise of a somewhat metallic 

 color. The remaining parts of the mouth are more or less yellow- 

 ish. 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 pubes- 

 cent. The legs are of a light pitch color. The lower part of the 

 head is impressed with two rather semicircular series of punctures, 

 similar punctures occurring along the internal margin of the eyes. 

 The thorax is marked with six series of them and on the elytra they 

 are arranged in lines. The sternal carina is well developed, the 



