174: THE CANADIAN ENTOMOLOGIST. 



obtuse. Scutellum rather obtus-angular. Elytra, alitrunk,* and abdomen 

 very much dilated, nearly twice the width of the prothorax, without furrows, 

 with several rows of obsolete mammillated impressions. Legs rather longer 

 and more slender than those of Elaphrus ; the hands of the male have the 

 first four joints a little dilated and furnished underneath with a brush. 



[61] 87. Opisthitjs Richardsonii, Kirby. — Plate i. fig. 9. Length of 

 body 4 J lines ; breadth of prothorax 1 line j of elytra taken together 2f lines. 

 Mr. Drummond, from my description of this curious insect, thinks it was 

 taken in May, 1825, on an island of Lake Winnipeg, frequenting moist 

 muddy places from which the water had shrunk. 



Body with the gloss obscured ; underneath black, somewhat hairy, above a 

 little bronzed. Antennae nearly half the length of the body, first four joints 

 greenish-bronzed, the rest deep blue ; front with a slight impression between 

 the antennae and a few scattered short whitish hairs : prothorax very short, 

 more bronzed, transversely very minutely wrinkled : elytra with three rows 

 of obloug greenish very slight impressions, each with a central oblong eleva- 

 tion, with another levigated one between each; adjoining the lateral margin 

 is a fourth series of greenish-bronzed more numerous impressions without 

 any central or intermediate elevations : thighs green-bronzed, tibise obscurely 

 rufous, tarsi black, legs hairy. [Taken at Fort Simpson, Mackenzie River, 

 by Mr. Robert Kennicott.] 



88. Elaphrus Clairvillii, Kirby. — Plate i. fig. 8. Length of body 

 4 lines. A single specimen taken in the journey from New York to Cumber- 

 land-house. 



[62] Body glossy; underneath green-bronzed; above black slightly bronzed, 

 covered With minute scattered, gilded punctures. Mandibles and palpi 

 piceous; antennae black, with the three first joints dark blue; front with an 

 elevation between the eyes, rather deeply impressed in the centre : prothorax 

 longer than wide, uneven, with two large discoidal elevations separated by a 

 dorsal channel, each with a central impression ; a single basilar impression 

 at the posterior angles tinted with blue : elytra with four irregular rows con- 

 taining in all twenty-one slight circular impressions punctured, and tinted 

 with blue, each, except the marginal ones surrounded by an elevated ring, 

 and placed in a wider impression ; between each of these impressions in the 

 two first rows is an elevated and levigated space : thighs glossy-green, the 

 posterior pair rufous at the base ; tibiae and tarsi piceous. 



I am doubtful whether this species may not be Mr. Say's E. riparius, but 

 it is not the real one, from which, and E. uliginosus, it is distinguished by 



* The alitrunk is that part which bears the wings and the four posterior legs. 



