Donacia.] PHYTOPIIAGA, 273 
which is unicolorous golden green, with the under-side clothed with 
thick yellowish, almost golden, pubescence ; occasionally the elytra are 
a little coppery on the middle of their surface; from unicolorous 
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 antenne are dark with the base 
metallic, and the legs are unicolorous, and ccloured 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. 83-10 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 armed with a distinct but smaller tooth. 
On aquatic plants; rather local, but not uncommon in many districts; Mickleham, 
Lee, Maidstone, Bearsted (Kent) ; Deal; Hastings; New Forest; Sandown; Glan- 
villes Wootton; Bath ; Swansea; Droitwich; Hveshain; Knowle ; Cannock Chase; 
near Burnt Wood, Staffordshire; Cheshire; Liverpool; Manchester district ; 
Northumberland district, rare; Scotland, recorded from the Clyde and Forth 
districts ; but Dr. Sharp says that no Scotch specimen has come under his notice. 
Ireland, Killarney, Portmarnock, Lough Neagh, &c. 
D. obscura, 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, 
antenne rather stout, black, with base metallic, third joint nearly twice 
as long as second; thorax quadrate, with sides almost straight, thickly 
and strongly punctured on dise, rugose at sides, central furrow often 
almost obsolete, but sometimes distinct, anterior angles forming a 
distinet 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. 85-10 mm. 
Male with the last ventral segment truncate and impressed at apex, 
female with the last segment rounded. 
On flowering Scirpus and Carew in May ; rare; Arundel (S. Stevens) ; Mabberley, 
Cheshire, near Castle Mill (Chappell) ; 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. i 
