48 COLEOPTERA. 



of these names to the insect now being considered ; but, as 

 Dr. Sharp observes, it must be understood that the assign- 

 ment of pubescens, Gy]l., to the insect we know by that 

 name is conventional and traditional, rather than evident 

 from the description itself. 



Dr. M'Nab records S. discretus from Newcastleton in 

 Roxburghshire, taken in July last; and my friend Mr. 

 T. J. Bold appears to have found it commonly in Northum- 

 berland. He is of opinion, from always taking it in com- 

 pany with a. nigrita, that those two are but sexes of the 

 same species. I have never found discretus in the south of 

 England, where nigrita is common enough j but Dr. Power 

 has taken it at Lee and at Birdbrook, in Essex. 



9. Hydroporus monticola. Sharp, 1. c, 84 (described) ; 

 T. J. Bold, 1. c. 



Very closely allied to H. melanarius, but smaller, nar- 

 rower and more depressed, with the elytra much duller, more 

 sparingly and finely punctured, and not quite so destitute of 

 pubescence. 



Found on the mountains and exposed moors of Scotland 

 and Wales, viz., Snowdon, Mamsoul, Rannoch and Thorn- 

 hill ; also by Mr. Bold in Northumberland and Cumberland, 

 in mossy holes on moors. The only two specimens that have 

 occurred to myself, on Rannoch Moor, are extremely diver- 

 gent from the type, and in different directions; one being 

 larger than melanarius and very elongate. 



There appears to be yet another mountain species of Hy- 

 droporus, allied to melanariusj of similar longish, quadrate 

 build, but shorter and more convex, thus differing from 

 M. monticola, and apparently coming very close to S. ce- 

 latus. This is H. Kraatzii (Schaum in litt.), Kraatz, Berl. 

 Ent. Zeit., 1867, 384; found on the Schneeberg. 



