DONACIA. 281 



cccclxix. Macroplea Ant. with the 4th and following joints elongated, 2d 

 and 3d very short : elytra with a spine at the apex : legs slender, longish ; 

 tibia simple, hinder pair more or less flexuous ; tarsi long. 



cccclxx. Orsodacna Ant. with short joints ; terminal ones slightly thick- 

 ened : palpi elongate, thickened at the tips : head exserted : tho. narrowed 

 behind, not tubercled : legs longish, simple. 



cccclxxi. Crioceris Ant. with short joints, gradually increasing in length to 

 the apex : palpi moderate, filiform : tho. immarginate, much narrower than 

 the elytra, which together are somewhat 4-drate, and broad. 



cccclxxii. Zeugophora Ant. with short joints, the 5 apical ones shorter than 

 the 3 preceding : palpi short, filiform, stout : tho. tuberculated on the 

 sides, the base narrower than the elytra, which are rather oblong and 

 rounded at the tip. 



468 Donacia Fabricius. 

 § A. Hinder thighs elongate, with 2 or 3 teeth beneath, in $ . 



2196 crassipes Fab. E. ii. 126. — Ste. M. iv. 268. — Le. aquatica Don. iii. 

 pi. 31. ? — Broad, flat; above violet or greenish, beneath with silvery pile-, 

 disc of thorax smooth, with a short channel; elytra deeply punctate. striate, 

 interstices smooth ; hinder thighs very long, curved, 3-toothed in the £ , 

 1 -toothed in the <j> . (L. 4-5 1. ) On the water lily: near Brentford; 

 Kew; Tottenham; Windsor; N. of England : 6-8. 



2197 cincta Germ. — Kunze, E. F. 5. — - Ste. M. iv. 268. — Le. aquatica 

 Mart. C. pi. 28. f. 16, 17. — Rather convex; above brassy-green, tinted 

 with violet ; beneath with silken silvery pile ; thorax with a short dorsal 

 channel, the disc wrinkled; elytra deeply crenate-striate, interstices thickly 

 rugose-punctate transversely ; thighs thickened, violet brown, hinder pair 

 moderately elongate, of <? with 2, of ^ with 1, short tooth. (L. 3^-4 1.) 

 Aquatic plants : Ealing ; Windsor ; Wimbledon Common ; Weston ; 

 Newcastle ; Scotland : 6-8. 



2198 dentata Kunz£ E. F. l. — Hoppe, 40. f. 2. — Ste. M. iv. 269. — 

 Flattish ; brassy, with a glossy pile beneath ; head punctate ; thorax wide, 

 roughly punctured, and with a short channel behind; elytra flat, impressed 

 towards the suture, the apex narrowed, obliquely truncate, and with a 

 slight appendage ; disc punctate-striate ; interstices rough ; legs reddish ; 

 hinder thighs 2-toothed ; hinder tibia? of $ with 4 or 5 minute denticu- 

 lations near the tip within. (L. 3|--4| 1.) Water lily, &c. : Windsor; 

 Hainault ; Hertford ; Epping ; Salisbury ; Cumberland : 6. 



2199 angustata Kunzi, E, F. 8 Ste. M. iv. 269. — Do. bidens Oliv. E. iv. 



75. pi. 2. f. 12. ? — Flattish ; narrow ; brassy or coppery ; head punctured ; 

 thorax 4-drate, roughly punctured, with a short channel in the middle of 

 the disc ; elytra slightly convex, with 4 depressions towards the suture, 

 apex narrowed, sinuate-truncate, slightly appendiculated ; disc moderately 

 punctate-striate ; legs reddish, thighs and tibia? brownish above, hinder 

 thighs 2-dentate. (L. 4-4^ 1.) Aquatic plants: banks of Thames; 

 Wandsworth Common : 6. 



2200 melanocephala Marsh, i. 348. — Ste. M. iv. 270. — Slightly convex ; 

 brassy or greenish-copper ; with a pale tawny pile beneath ; head black ; 

 thorax with a deep short dorsal furrow ; elytra finely punctate-striate, 

 the apex slightly truncate ; tip of suture with a coppery streak ; thighs 

 red, apex and tibia? pitchy- black, hinder thighs obsoletely 2-toothed. (\„ 

 3 1.) Aquatic plants : Fulham ; Bristol ; 6. 



§ B. Hinder thighs shortish, with one tooth. 

 1. Legs concolorous with body. 



2201 Lemnae Fab. E. ii. 128. — Ste. M. iv. 210,—Hoppe, 40. f. 4. — Flat- 



b b 3 



