aquatic Coleoptera from Ceylon. 353 



coarse and close, so that the surface is less shining. H. densus 

 is also a less convex insect, and the serial punctuation is quite 

 obsolete at the extremity of the elytra. 



Kandy and Dikoya, in February ; Bogawantalawa, in 

 March. Half-a-dozen examples. 



Laccohius rectus, sp. nov. 



Ovalis, subdepressus, fuscus, nitidus, fere Isevigatus, capite 

 thoraceque nigricantibus, illo anterius utrinque, hoc ad latera flavis ; 

 antennis, palpis, pedibus elytrisque pallide flavis, his lineis multis 

 nigris ornatis. Long. 2:^ mm. 



Head yellow beneath, dark above, marked rather indistinctly 

 with yellow on each side, obsoletely punctate. Thorax dark in 

 colour, vsdth the sides broadly yellow, almost impunctate. Elytra 

 yellow, with elongate uninterrupted lines of dark colour ; these 

 lines are very numerous, and each one is about as wide as the 

 interval separating it from the next ; there is some extremely 

 minute punctuation serially arranged. The mesosternum is armed 

 with a conspicuous lamina. 



Kitulgalle. Six specimens. 



I do not know any other Laccohius in which the 

 alternate yellow and black lines are arranged as definitely 

 as in this species. 



Berosus decrescens. 



Berosus decrescens, Walker, Ann. & Mag. Nat. Hist., 

 1859, p. 258. 



Parvus, testaceus ; abdomine fasco, capite metallescente ; thorace 

 in medio metalhco-bivittato ; elytris fusco-irroratis ; crebre minus 

 subtiliter pvmctatus, elytris pube depressa vestitis, subtilissime 

 striatis. Long. 3 mm. 



In this insect the mesosternum has a fine carina extending over 

 all its length, but scarcely raised from the surface, so that it might 

 be overlooked, except that it is black in colour, while the breast is 

 yellow. The club of the antennae is clear yellow. The punctuation 

 of the upper surface is rather coarse, and the stris of the elytra are 

 so fine that they are only conspicuous because of their course being 

 indicated by a line of black colour. Each puncture on the wing- 

 cases is also marked with black, and there are a few distant small 

 black spots. 



Kitulgalle. A series of specimens. 



