72 HYDRADEPHAGA. DYTICIDJE. 



segments yellow, of <j> yellow with black spots on the sides; legs yellowish. 

 <j? with the base of the elytra thickly covered with short stria?. (L. 5 1.) 

 Wandsworth Common ; Southend ; Cambridge ; Bottisham ; Whittlesea 

 Mere, Aberystwith ; Carlisle, &c. : 3-6. 



556 exoletus Forst. C. 57. — Ste. M. ii, 70. — Dy. adspersus Pz. F. xxxviii. 

 f. 18. — Oblong-ovate, yellowish: crown with a narrow black stripe, in 

 which are 2 pale dots ; thorax immaculate, or with 2 brownish spots on 

 the hinder margin ; scutellum black, the tip pale ; elytra very thickly ir- 

 rorated with black, and with 3 irregular punctate stria; ; 4 anterior legs 

 yellowish, posterior pair darker. (L. 5 1.) Near London; Cambridge; 

 Whittlesea Mere ; Netley ; Carlisle ; near Edinburgh, &c. 3-5. 



557 bistriatus Berg. Nom. i. 42. pi. 8. f. 5. — Dy. agilis Pz. xc. f. 2. — 

 Ste. M. ii. 71. — Oblong-ovate; above yellowish, beneath black: crown 

 and the anterior and posterior margins of the thorax in the middle black ; 

 elytra thickly irrorated with black, the outer edge and a line near the 

 suture spotless ; the disc with 2 punctate stria? ; sternum at the tip and 

 legs dull red ; thighs with a dusky spot ; $ with the elytra obscurely 

 strigose. (L. 5-5^ 1.) Kensington Gardens; Cambridge; Whittlesea 

 Mere ; Exeter ; Norfolk ; Mar ton : 9-5. 



558 adspersus Fab. E. i. 267. — Ste. M. ii. 71. pi. xii. f. 3. — Oval ; above 

 testaceous : crown black, with 2 pale spots ; thorax with 2 very faint spots 

 on the hinder edge ; elytra thickly irrorated with black, the outer edge 

 and a faint sutural line clear, the disc with 3 punctate stria? ; breast black ; 

 sternum testaceous ; abdomen black, with the edges of the segments 

 testaceous; legs yellowish. (L. 5 1.) Cambridge and Whittlesea Mere, 

 and in Norfolk : 3-6. 



§ C. Lab. palpi, with 3d joint scarcely shorter than 2d : elytra smooth : body 

 oblong : — Leiopterus Eschscholtz. 



559 agilis Fab. E. i. 266. — Co. oblongus. Ste. M. ii. 65. pi. xii. f. 1. — 

 Oblong ; ferruginous, finely punctulate : crown dusky ; thorax with the 

 disc blackish, edges dull red ; elytra fuscous, with the margin pale, disc 

 with several irregular stria? ; breast and abdomen black ; legs and antennae 

 dull red. (L. 3^-4 1. ) Cambridge; Whittlesea Mere ; Horringsea Fen ; 

 in Norfolk &c. ; rare near London : 3-6. 



560 arcticus Pk. F. i. 201. — Ste. M. ii. 194. — Oblong-ovate; finely 

 reticulate-strigose ; black : head red in front, with 2 pale spots behind ; 

 thorax pale reddish-yellow, with the anterior and posterior margins black 

 (or nearly black, with the sides alone pale) ; elytra fuscous, with the lateral 

 margins pale ; margins of abdominal segments and the legs pale testaceous ; 

 sternum dull red. (L. 3^ 1.) In Scotland but rare : 6. 



§ D. Palpi as in § C. Elytra smooth : body more or less ovate, slightly 

 convex, obscure ; crown generally with two red dots : hinder legs in <J 

 ciliated on bothsides, of the <j> on one side only: — Agabus Erichson. 



a. Post, tarsi with basal joint alone ciliated beneath in the $ . 



561 guttatus Pk. F. i. 211. — Ste. M. ii- 66. — Dy. fenestratus Pz. F. xc. 

 f. 1. — Oblong-ovate; flattish ; thickly and very finely punctulated 

 throughout ; shining black : elytra with 2 rounded pale spots, a row of 

 punctures near the suture, and 3 rows of punctate stria? on the disc ; legs 

 and antenna? rusty-pitchy. (L. 4 1.) 



Var. Co. fontinalis. — Ste. M. ii. 66. — More oblong and convex, with the 

 upper surface tinged with biassy ; the 2d spot on the elytra nearly obliterated. 





