538 Entomological Papers. [No. 6. 



abbreviates signatus. Elytra subliliter atriato punctata. Tarsi 

 o nines uuguibus basi fortiter unidentatis. Carina prosternalis cul- 

 triformis. 



Specimen singulum f. nocte ad lumen cepi. 



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

 species, having the perforated 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. 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 at once attracts attention by the reddish colour of its 

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

 ever, the clypeus and the anterior margin of the labrum of a yellow- 

 ish brown, the latter being otherwise of rather a metallic colour. 

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

 Joints 1-6 of the antennae are yellowish too, with the exception of 

 the 2nd which is dark ; joints 7-9 are blackish and pubescent. The 

 legs are of a light pitch colour. The lower part of the head is im- 

 pressed 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 them and on the elytra they are 

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

 ternal part has a sharp edge, whilst the mesosternal one is obtuse 

 on the back and the metasternal part depressed and slightly 

 grooved. 



29. Hydrous inconspicuus. JV. 



H. praecedente minus convexus, supra oleagino-niger, subtus 

 rufo-piceus, ore testaceo. Long. corp. 4£ lin. 



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

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

 globosis, 9° magno, ovato. Caput, thorax et elytra ut in praece- 

 dente 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 com- 



