70 COLEOPTERA. 



na^ro\^'er, more regular, iininterrn)3ted, and continued to the 

 base parallel with the sutural marking ; the punctuation also 

 is more uniform and coarser. 



Taken by Mr. Waterhouse, most probably in the London 

 district, 



13. Hydroporus unistriatus, Schrank; Wat. Cat. p. 13. 



14. Hydroporus bisulcatus, Curt, j Wat. Cat. p. 13. 

 Thi^, and the preceding species, must be rejected from our 



lists, having been introduced by a mistake of nomenclature. 



15. Hydroporus griseo-striatus, De Geer, Ins. iv. 103 



( Dytiscus) ; Aube, Sp. 541. 

 Dijtiscus halensis, Paykull. 



Similar in shape to A. picipes, Fab., but a little less 

 robust, with a darker thorax, and much finer punctuation. 



Fulvous, with the thorax more or less pitchy on the disc, 

 and the elytra pitchy black, with thin yellow longitudinal 

 striae. 



Dr. Schaum, during his recent visit to London, pointed 

 out this species, which has been doing duty for II, halensisy 

 Fab., in most metropolitan collections. 



It has been taken in the north of England and Scotland, 

 by Messrs. Hislop, Soraerville and others. 



16. Hydroporus halensis. Fab. Ent. Syst. i. 108, 52 



[Dijtiaais)', Payk. ; Aube; Wat. Cat. p. 13; Rev. 



H. Clark, Journ. Ent. i. 470. 

 areolati/Sf Dufts. ; Lacord. 

 severiifiy Clark, Proc. Ent. Soc. 1 Sept. 1862, Zool. 



8219(1862). 

 This species must remain in' our lists, since the single 



