DONACIA. 283 



ashy silken pile ; thorax elongate, punctured, silky ; elytra oblong, convex, 

 punctate-striate, the back slightly impressed, the tip rounded ; logs and 

 antennae rather slender and elongate. (L. 3^-4^ 1.) Aquatic plants : 

 London district : 5-6. 



2. Legs pale. 



2210 rustica Sch'iippel. — Kunze, E. F. 31. — Ste. M. iv. 274. — Do. discolor 

 Hoppe, 45. f. 8. S • 9. £ . — $ brown black ; <j> greenish-brass ; both sexes 

 with mouth, antenna?, apex of abdomen, and legs red ; elytra crenate-striate, 

 the tip rounded; hinder thighs with an acute tooth. (L. 3-4 1. ) 

 Aquatic plants : Greenwich; Battersea fields; Cambridge; Bristol; De- 

 vonshire, &c. : 6. 



2211 nigra Fab. E. ii. 128. — Ste. M. iv. 274. — Do. palustris Pz. F. 

 xxix. f. 10. — Brassy black; thorax bluish, somewhat heart-shaped; 

 elytra punctate-striate, interstices transversely wrinkled, tip rounded ; legs 

 longish, antenna?, apex of abdomen, and margins of its segments, red ; 

 hinder thighs obtusely toothed. (L. 5-6 1.) Aquatic plants : Wool- 

 wich and Greenwich marshes ; Battersea; Southend; Cambridge; Wit- 

 tlesea, &c. : 6. 



B. Hinder thighs not toothed. 



2212 Menyanthidis Fab. E. ii. 129. — Ste. M. iv. 274. — Le. simplex 

 Mart. C. pi. 28. f. 25. — Elongate, flattish ; above shining brassy-green, 

 beneath with a silvery pile ; elytra crenate-striate, interstices transversely 

 wrinkled, tip obtusely rounded ; legs elongate, pitchy-red, hinder thighs 



! long and bent, slender at the base ; antenna? reddish, dusky at the base. 

 (L. 5-6^1.) Aquatic plants; local: Surrey Canal ; Whittlesea Mere; 

 Norfolk": 6. 



2213 simplex Fab. E. ii. 129. — Ste. M. iv. 275. — Do. semicuprea Pz. F. 

 xxix. f. 14, — Rather convex; above greenish-brass, beneath with a 

 silken-ashy down ; head brownish ; thorax very much punctured ; elytra 

 crenate-striate, interstices transversely wrinkled, the back of a bright red- 

 copper ; legs dull red, thighs thickened and brassy at the tip, antenna? 

 pitchy-black. (L. 3^-4^1.) Aquatic plants : generally distributed : 6. 



2214 linearis Hoppe, 46. f. 10. — Ste. M. iv. 275. — Elongate, flattish ; dull 

 greenish-brass, or purplish copper ; beneath with a silvery pile: thorax 

 4-drate, thickly punctured ; elytra punctate-striate, interstices strigose 

 transversely, disc with 4 obscure depressions, placed 4-angularly, apex 

 truncate ; thighs brassy, base and tibia? dull testaceous, latter bent ; 

 antenna? black, the base of each joint dull red. (L. 4-5 1.) Aquatic 

 plants : plentiful, and generally distributed : 6-7. 



2215 Typha? Brahm. — Kunze, E. F. 47. — Ste. M. iv. 276. — Cur. xi. 

 pi. 494. — Somewhat linear, brassy-green ; beneath with a silken-silvery 

 pile ; thorax flattish, thickly punctured and rugged ; elytra punctate- 

 striate, interstices finely strigose ; apex slightly notched ; disc with a 

 golden-red streak near the suture, and more or less varied with blue 

 tinges ; legs and antenna? nearly as in Do. linearis. (L. 4-5 1.) Rather 

 local, on aquatic plants : Surrey and Croydon canals ; Wandsworth Com- 

 mon : 6. 



2216 Hydrochasridis Fab. E. ii. 129. — Pz. F. xxix. f. 17 Ste. M. iv. 



276. — Flattish ; obscure brown-brass, opaque, clothed throughout with a 

 dense ashy pubescence : thorax 4-drate, obscurely punctured ; elytra 

 faintly punctate-striate, interstices finely coriaceous ; legs longish ; thighs 

 with base testaceous, apex brassy, tibiae and tarsi dusky-testaceous ; an- 

 tenna? black, with some of the terminal joints reddish at the base. 



