270 PHYTOPHAGA. [| Donacia. 
1. Size larger; elytra with the interstices 
coarsely rugose, black or purplish-black in 
DOGh Sexes wine «oy Wwe eee 6 ey Reena Sepp, 
(nigra, F.) 
2. Size smaller; elytra with the interstices 
finely rugose, black or eh ca black in male, 
coppery infemale. . . . OD. A¥FFInis, Kunze. 
D. crassipes, F. (spinosa, Thoms.). Rather depressed, violaceous 
or greenish-bronze, sometimes bronze with the elytra greenish at 
margins, thorax usually coppery, under-side with thickly shining silvery 
pubescence ; head finely and thickly punctured with the frontal furrows 
deep ; thorax broader than long, finely strigose, with a strong central 
furrow, and with the callosity near the anterior angles well ‘marked ; 
elytra with deeply punctured striae, apex truncate ; legs long, reddish 
with the upper side of the apical portion of the femora, and the external 
portion of the tibia, metallic. L. 9-11 mm. 
Male with the fifth ventral segment of the abdomen truncate at apex, 
the posterior femora stout and strongly bidentate, and the posterior 
tibize crenate dentate on their inner side. 
Female with the fifth ventral segment of the abdomen acuminate and 
deflexed at apex, and the posterior femora armed with a sharp, but 
less strong, tooth. 
On the leaves of the water lily (Nymphea alba) and other aquatic plants; not 
common, although found in some numbers where it occurs; Kew, Weybridge, Deal, 
Brentford, Tottenham, Tonbridge; New Forest; Burton-on-Trent; Mabberley, 
Cheshire ; Windermere; Northumberland district, Prestwich Carr; Scotland, local 
and rare, Clyde and Argyle districts; Highland lochs (Harker); Ireland, near 
Dublin ; the species is very widely distributed, and probably occurs in many other 
localities. 
D. dentata, Hoppe. Allied to the preceding, but smaller and 
narrower, and more convex, and easily distinguished by the form and 
sculpture of the thorax, which is as long as broad, and rather coarsely 
punctured on disc ; colour zneous or coppery with a greenish reflection, 
under-side silvery ; head with deep frontal furrows, antennz long ; elytra 
deeply punctate-striate, interstices diffusely strigose, apex truncate or 
feebly emarginate ; legs ferruginous with the external portions more or 
less eneous. L. 7-9 mm. 
Male with the first ventral segment of the abdomen longitudinally 
depressed in middle, and armed with two small tubercles, the posterior 
femora armed with two sharp teeth, and the posterior tibie crenate 
dentate below middle. 
Female with the first ventral segment of abdomen evenly convex, and 
the posterior femora armed with one rather sharp tooth, and one small 
tooth, which is sometimes obsolete. 
On aquatic plants; rare; Chobham; Sheerness; Shipley, near Horsham; Knepp 
Pond; Arundel; Tewkesbury ; ; Knowle, near Birmingham; Stephens gives as locali- 
