No. 9. — 1S56-S.] NEW CEYLON COLEOPTERA. 



25 



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

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

 same being deeply grooved in Hydrophilus. The insect attracts 

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

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

 clypeus 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 second 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 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 prosternal part has a sharp edge, 

 whilst the mesosternal one is obtuse on the back, and the 

 metasternal part depressed and slightly grooved. 



23, Hydrous inconspiquus. N. 



H. prascedente minus convexus, supra oleagino-niger, subtns rufo- 

 pieeus, ore testaceo. Long. corp. 4| Jin. 



Palpi maxill. art. 2° et 4° snbcylindricis, 3° apicem versus sensim 

 incrassato, sequente tertia parte longiore. Antennae art. 7-8 sub-globosis, 

 9° magno, ovate Caput, thorax et elytra, ut in praecedente sculpta et 

 signata. 



In lacu Colomb, mens. Jun. non infrequenter cepi. 



This is in every respect a normal species. The prosternal 

 carina has a sharp edge, the claws are simple, the antennal 

 club is composed of rounded joints, the elytra are of the typi- 

 cal structure, &c. In the latter respect as well as with regard 

 to the various series of punctures upon head, thorax and 

 elytra, it resembles the former ; the punctures of the elytra are, 

 however, less distinct, Joints 1-6 of the antennae are yellowish, 



