Water-beetles. 3 



4. Hydrocanthus prolixus n. sp. Ovalis, elongatus, trans- 

 versim convexus, pernitidus, rufo-castaneus, supra nigricans, an- 

 terius limbo late vageque rufescente; elytris laevigatis, seriebus 

 punctorum obscuris. Long. 6, lat. 2% mm. 



This species is distinguished from H. micans and H. ferru- 

 ginicollis as well as from H. indicus, by the more obsolete serial 

 punctures on the elytra. It is considerably more elongate than 

 H. indicus. The lateral margin of the thorax is narrower than 

 it is in H. grandis. The undersurface is obscure red, becoming 

 darker towards the tip of the abdomen. The legs are red, the 

 antennae yellow. 



Gebel Ahmed Agha, in February and March. Three spe- 

 cimens. 



5. Hydrocanthus grandis Cast. Gebelein, 16 th February. 

 One specimen. 



6. Hydrocanthus deyrollei Sharp. Gebelein, 1 specimen. Of 

 this species only three examples are known. I do not possess 

 any exponent of it in my own collection. This individual is 

 unfortunately in bad preservation. 



7. Laccophilus taeniolatus Reg. Three specimens were found 

 of this species which is said by its describer to be extremely 

 variable. Gebel Ahmed Agha. March. 



8. Laccophilus restrictus Sharp, var.? One specimen; differs 

 from the original type in being slightly smaller, and in that the 

 elytra are of a smoky, or fuscous, colour. Near Giseh, Cairo 

 in December. 



9. Hydrovatus sordidus Sharp. Four specimens. Previously 

 known from northern Egypt, Mesopotamia and Arabia. 



One specimen on waterplants, White Nile, Gebel Ahmed 

 Aga. Three specimens N. of Kaka. 



10. Hydrovatus compactus Sharp. Gebelein. One specimen. 

 The species is but little known but appears to be widely distri- 

 buted in Africa. The specimen from the White Nile is unusually 

 dark in colour and agrees in this respect with a specimen from 

 Cairo described by Dr. Regimbart. 



