340 Dr. David Sharp on some 



Mr. Lewis has given some particulars about the locali- 

 ties where he collected these insects in the ' Transactions ' 

 of the Society, 1882, pp. 475, et seq. His remarks con- 

 tain, however, no special references to the water-beetles. 



DYTISCID.E. 

 Hydrocoptus siihvittulus. 



Hydrocoptus suhvittulus, Motsch., Etudes Ent., viii., 

 1859, p. 43. 



Oblongo-ovalis, transversim convexus, testaceus, elytris casta- 

 neis, lateribus vittaque obsoleta singiili in medio testaceis, seriebiis 

 regularibus numerose punctatis. Long. 2 mm. 



Allied by the punctuation of the elytra to H. distincttis, 

 Wehncke {ruhescens, Slip., Dyt., No. 9), but differing by 

 the colour of the elytra, and by the presence of some 

 punctures along the base of the thorax. 



I think this is probably the H. subvittidus of Mots- 

 choulsky, a species which is apparently not included in 

 the Munich Catalogue, and is not referred to in my 

 systematic work on the family. 



About fifteen specimens were procured in February, 

 1882, at Dikoya and Kandy, exhibiting very little varia- 

 tion. 



Hydrocoptus bii'ittis. 



Hydrocoptus hivittis, Motsch., oj?. cit., p. 44. 



Two specimens at Kandy in February. 



Canthydrus luctuosus. 



Hydrocanthus luctuosus, Aube, Spec. Gen. Hydroc, 

 p. 408. 



Dikoya ; a good series. Most of the specimens are 

 C. sexpunctatus, Shp., which must be reduced to a 

 synonym, as it is no doubt either a variety, or the other 

 sex, of C. luctuosus. A single specimen found at Boga- 

 wantalawa is to some extent intermediate between C. 

 luctuosus and C. Icetahilis, but may probably prove to be 

 a distinct species. 



