Donacia. | PHYTOPHAGA. 271 
ties, Epping, Windsor, Hainault, Hertford, Salisbury, and Cumberland. Ireland, 
Armagh (Johnson). 
D. versicolorea, Brahm. (bidens, Ol. ; eincta, Germ.). Of a shorter 
and rounder form than the two preceding, and more shining, of a 
greenish metallic colour at sides, with the disc of thorax and elytra 
violaceous, or coppery, sometimes dark green, under-side silvery ; head 
thickly and finely punctured ; thorax, especially in the male, a little 
longer than broad, contracted behind middle, strigose and rather strongly 
and sparingly punctured on disc; elytra deeply punctate-striate, inter- 
stices diffusely strigose, apex truncate; legs reddish with the club of 
the femora and usually external portions of the tibiz metallic, violaceous. 
L. 6—9 mm. 
Male with the posterior femora armed with two teeth, and the 
posterior tibiz crenulate on their inner side. 
Female with the posterior femora armed with a small tooth, and the 
posterior tibiz very rarely crenulate. 
On aquatic plants; not uncommon and widely distributed; Lee, Chobham, 
Woking, Esher, Wimbledon, Ealing, Rusper, Aylsham; Deal; Hastings; Arundel ; 
New Forest; Sandown; Swansea; Barmouth; Knowle, near Birmingham; Liver- 
pool; Manchester, general on Potamogeton ; Northumberland and Durham district ; 
Scotland, local, Solway, Tweed, Forth, and Dee districts; Ireland, near Dublin. 
D. sparganii, Ahr. In general appearance this species much 
resembles D. dentata, but may easily be distinguished by the shorter 
femora and the sculpture of the thorax, which is finely strigose and 
not punctured on disc; the legs are unicolorous, dark, and more or less 
metallic, whereas in D. dentata they are more or less red, and the 
antenne also, which in the latter species have the basal part of the 
first joints, at all events in the male, red, are in D. sparganii uni- 
colorous; the colour of the upper side is usually dark coppery green ; 
the thorax is quadrate, and dull, and the elytra are not so deeply 
punctured as in the preceding species, nor are the interstices so plainly 
strigose. L. 7-9 mm. 
Male with the fifth ventral segment of the abdomen impressed at 
apex, the posterior femora bidentate, and the posterior tibie slightly 
crenulate internally. 
Female with the fifth ventral segment of abdomen even, and the 
posterior femora armed with two teeth, the external one being small. 
On aquatic plants; very local, but sometimes not uncommon where it occurs ; 
Wandsworth; banks of Thames; Pegwell Bay, in ditches (Gorham); Sandwich ; 
Burton-on-Trent ; Manchester district, Clifton, Charlton, Stretford, &c. 
D. dentipes, F. (aquatica, L., Thoms.). A very conspicuous 
species, which may easily be recognized by the broad purple red stripe 
which runs down the elytra near suture, the suture and margins as well 
as the head and thorax being golden green; the antenne and legs are 
unicolorous, the latter being mostly of a golden metallic colour and 
