76 HYDRADEFHAGA. DYTJCIDJE. 



streaks; body beneath and legs rusty-red. (L. 5-6 1.) Croydon Canal; 

 Mildenhall Drain, Cambridgeshire ; Parley Copse, &c. : 4-6. 



589 guttiger Gyll. i. 499. — Ste. M. ii. 81. — Oblong-ovate, slightly con- 

 vex ; black, pitchy beneath : thorax with anterior angles slightly tinted with 

 dull red ; elytra with a reddish-yellow transparent streak near the outer 

 margin about the middle, and a round spot of similar hue within the tip ; 

 4 anterior legs dull red, 2 hinder pitchy. (L. 4-4^ 1.) London district; 

 ponds, Netley ; Bewdley Forest ; Longnor, Salop, &c. : 4-7. 



590 angustior Gyll. i. 500. — Ste. M. ii. 80. — Rather narrow ; oblong-ovate, 

 slightly convex, brassy black ; beneath pitchy ; elytra with 2 small (some- 

 times obliterated) yellowish transparent spots, 1 of fhem towards the mid- 

 dle of the outer margin, the other near the tip ; mouth and antenna? dull 

 red; legs pitchy. (L. 4 1.) London district ; Whittlesea Mere : 4-6. 



591 4-notatus Ste. M. ii. 83. — Rather oblong-ovate ; convex; shining black : 

 crown with two very conspicuous red spots; elytra with a round white 

 spot near the outer edge behind the middle, and a smaller one near the tip ; 

 legs black; 4 anterior tarsi and antennae rusty-red. (L. 4^1.) London 

 district ; Ashburton, Devon : 4-6. 



592 ater Be G. iv. 401. — Px. F. xxxviii. f. 15. — Ste. M. ii. 82. — Oblong- 

 ovate ; convex ; black with a brassy tinge ; beneath pitchy : elytra with 2 

 transparent pale testaceous streaks, 1 placed near the middle of the sides, the 

 other towards the tip ; antenna? and 4 anterior legs reddish. (L. 6-71.) 

 London district ; Sundridge, Kent ; Norfolk ; Currie, Scotland : 6-7. 



593 obscurus Marsh, i. 414. — Ste. M. ii. 82. — II. 4-guttatus Erich. K. 

 i. 154. — Oblong-ovate; convex; black, rather obscure ; beneath pitchy- 

 brown : elytra with 2 minute whitish transparent spots, placed as in Co. 

 ater; legs and antenna? pitchy. (L. 4|-5^ 1.) With the preceding species; 

 and in Roxburghshire : 4-6. 



99 Agabus Leach. 



594 f serricornis Pk. F. iii. 443. — Ahr. F. v. f. 3. — Ste. M. ii. 84. — 

 Ovate, convex, obtuse ; pitchy-black, smooth ; sides of the thorax and of 

 the elytra, the body beneath and the legs pitchy-red : anterior thighs of 

 the £ compressed, toothed beneath, the tarsi slightly patellate ; <j> with 

 the antennae and legs simple. (L. 5^-6 1.) Netley; rare: 8. 



100 Hydaticus Leach. 



§ A. Body oblong-ovate, rather convex ; interm. tarsi of $ patellate : — 



Hydaticus. 



595 transversalis Fab. E. i. 265. — Pz. F. lxxxvi. f. 6. — Ste. M. ii. 85. 

 — Black : thorax with its anterior and lateral margins broadly ferruginous ; 

 elytra with the outer edge broadly yellowish, and with a slender waved pale 

 yellowish transverse stripe near the base, neither touching the suture nor 

 the margin; body rarely dull red beneath; legs dull red. (L. 6-6^1.) 

 Ponds, Battersea fields ; Yaxley Fens ; Whittlesea Mere ; Cambridge : 

 4-7. 



596 Hybneri Fab. E. i. 265. — Oliv. iii. pi. 4. f. 33. — Ste. M. ii. 85. — 

 Black : thorax with the anterior lateral margins dull red ; elytra with a 

 broad yellowish margin ; 4 anterior legs pale testaceous, hinder pair pitchy- 

 black. (L. 6|-7 1.) With the preceding species, but less abundantly: 4-7. 



597 stagnalis Fab. E. i. 265. — Ste. M. ii. 85. pi. xii. f. 5. — Black : head 

 yellow ; the crown black, with two red dots ; thorax reddish yellow, with 

 a black patch in the middle behind ; elytra with the outer margin broadly 



