I 



aquatic Coteoptera from Ceylon. 349 



smaller species of the old genus Hijdrohius, but the 

 characters of these divisions are of somewhat doubtful 

 importance, being variable from species to species. 

 H. minimus has a small curvate transverse elevation on 

 the mesosternum, and the front and middle femora 

 pubescent beneath, while the hind femora are pubescent 

 merely along their anterior margin. 



Dikoya, in January. A small series of examples. 



Hydrohius evanescens, sp. nov. 

 Ovalis, angustus, fusciis, supra aeneus ; elytris apice flavescente, 

 antennarum basi palpis pedibiisque testaceis ; supra crebre punc- 

 tatus. Long. 2 mm. 



This is very similar to H. miyiimus, but is somewhat brassy in 

 colour above, and is more distinctly punctulate. On the under 

 surface the hind femora have no pubescence, and the mesosternal 

 crest is more marked, the transverse elevation being rather more 

 raised, while from the middle of it there extends backwards a 

 shght longitudinal carina. 



Kitulgalle and Kandy. Two specimens. 



Hydrohius (Anaccena) advena, sp. nov. 



Ovalis, convexus, nitidus, testaceus, supra piceus, limbo dilutiore ; 

 elytris parce punctatis. Long. 2^ mm. 



Palpi pale yellow, quite short, terminal joint twice as long as 

 the preceding one. Head shining, impunctate. Thorax also im- 

 punctate. Elytra with elongate sutural stria, sparingly but not 

 finely punctured. 



This species has the mesosternum unarmed, and the 

 hind femora covered with pubescence beneath, except at 

 the tip, so that it may be placed in Anaccena. Looking 

 at the upper surface only it may be distinguished from 

 H. minimus by being rather larger, and having the 

 elytra considerably more coarsely punctate. 



Bogawantalawa, in April. Three specimens. 



Philydrus iteratus, sp. nov. 

 Ovalis, niger, nitidus ; prothorace lateribus piceis, antennarum 

 basi, tarsis, palpisque rufis, his articulo basaU nigricante, anten- 

 narum clava fusca ; dense minus fortiter punctatus. Long. 7 mm. 



