Dunar.Ia.~\ rHVTOPHAOA. 273 



which is uuicolorous golden green, vith the under-side clothed with 

 thick yellowish, almost golden, pubescence ; occasionally the elytra are 

 a little coppery on the middle of their surface ; from unicoloroua 

 specimens of D. lemna, which rarely occur, it may be known by the 

 more numerous impressions on the elytra, and the more closely and 

 less strongly punctured thorax; the antennre are dark with the base 

 metallic, and the legs are unicolorous, and coloured as elytra; the 

 punctures on the elytra are comparatively fine, and become almost 

 obsolete towards apex, and the interstices are finely rugose, and are 

 rather thickly set with large punctures at base. L. 8|-10 mm. 



Male with the elytra narrower and more pointed behind, the fifth 

 ventral segment of abdomen subtruncate and rather broadly impressed 

 at apex, and the posterior femora armed with a strong sharp tooth. 



Female with the elytra broader and less pointed behind, the fifth 

 ventral segment of the abdomen somewhat produced at apex, and the 

 posterior femora urmed with a distinct but smaller tooth. 



On aquatic plants ; rather local, but not uncommon in many districts; Jlirkleham, 

 Lee, Mnidstoue, Bearsted (K^nt) ; Deal; Hustings; New Forest; Sandown ; Glan- 

 villes Wootton ; Bath ; Swansea; Droitwicli ; Evesbuin ; Kuowle ; Caunock Chase; 

 near Burnt Wood, Staffordshire ; Cheshire ; Liverpool ; Manchester district ; 

 Northumberland district, rare ; Scotland, reconled from the Clyde and Forth 

 districts ; but Dr. Sharp says that no Scotch specimen has come under his notice. 

 Ireland, Killaruey, Portmarnock, Lough Neagli, Ac. 



2>. obacura, Gyll. Of an obscure brownish-bronze colour, rather 

 dull, under-side thickly clothed with yellowish-golden or ashy-golden 

 pubescence ; head very finely sculptured, with a deep frontal furrow, 

 antennae rather stout, black, with base metallic, third joint nearly twice 

 as long as second; thorax quadrate, Avith sides almost straight, thickly 

 and strongly punctured on disc, rugose at sides, central furrow often 

 almost obsolete, but sometimes distinct, anterior angles forming a 

 distinct tooth ; elytra with comparatively fine rows of punctures, which 

 are finer, but distinct at apex, interstices finely rugose, rather thickly 

 furnished at base with large punctures, apex narrowly truncate ; the 

 impressions near suture are distinct, but at sides there is, as a rule, only 

 one longitudinal impression, which is sometimes more or less obsolete ; 

 legs dark metallic, posterior femora with a strong tooth in both sexes. 

 L. 8^-10 mm. 



Male with the last ventral segment truncate and impressed at apex, 

 female with the last segment rounded. 



On flowering Scirpus nnd Carex in May ; rare; Arundel (S. Stevens) ; Mahherley, 

 Cheshire, near Castle Mill (Cliappell) ; Scotland, Solway district, Dumfries (Sharp 

 and Lennon); also recorded doubtfully from the Tay district. 



D. thalassina, Germ. Elongate, subparallel, rather depressed, of 

 a golden green or coppery colour, sometimes reddish or cyaneous, 

 under-side thickly clothed with golden, sometimes ashy, pubescence; 



VOL. IV. T 



