62 NORTHERN ZOOLOGY. 



DESCRIPTION. 



Body glossy ; underneath green-bronzed ; above black slightly bronzed, covered with minute 

 scattered, gilded punctures. Mandibles and palpi piceous ; antenna? black, with the three first joints 

 dark blue ; front with an elevation between the eyes, rather deeply impressed in the centre : pro- 

 thorax 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 containing 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 levi- 

 gated space : thighs glossy-green, the posterior pair rufous at the base ; tibia? 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 being much less thickly dusted with green- 

 gold glittering punctures, which gives it a blacker hue. The impression also in the elevated space 

 between the eyes is much deeper. The blue-tinctured impressions of the elytra are also more 

 distinct, and surrounded by a more elevated ring. 



It may be here observed that the peculiar sculpture which is so conspicuous in the elytra of 

 Elaphrus may be first traced in those of Bembidium impressum which exhibits two gilded impres- 

 sions; in Opisthius these impressions become more numerous, and assume a seriatim arrangement; 

 and in the genus first named they become more perfect and prominent — this affords a further proof 

 of the affinity of the Bembidiadans and Elaphridans. 



(89) 2. # Elaphrus intermedius. Intermediate Elaphrus. 



E. (intermedius) punctulalissimus, subtus viridi-aneus, svpra nigro-aneus ; tibiis rufis ; elytrisfoveis subimpressis centro eminen- 



tibus quadruplici serie ; plaga elcvata, Iteviyata, discoidali, communi. 

 Intermediate Elaphrus, very minutely and thickly punctured ; underneath green-bronzed, above black-bronzed ; tibiae 



rufous; elytra with four rows of slight impressions with an eminence in the centre, and an elevated levigated 



discoidal space common to both elytra. 



Length of the body 4 lines. 



Taken by Dr. Bigsby in Canada. 



DESCRIPTION. 



This species resembles E. cupreus, but it is quite distinct. The body is more thickly and 

 minutely punctured on the whole upper surface ; underneath it is of a fine bronzed-green ; above it 

 is blacker and less brilliant : the head is greenish ; the middle space between the eyes is less ele- 

 vated than in that species, and wrinkled longitudinally without any impression : the impressions on 

 the discoidal elevations of the prothorax are fainter : the elytra like the other species have a qua- 

 druple series of impressions, but they are broader, more slight, without any elevated ring, are more 

 minutely punctured, have a slight elevation in the centre, and are of the same colour with the rest 

 of the elytrum ; the marginal series is nearly obsolete ; just before the middle, adjoining the suture 

 is a quadrangular elevation which unites with that of the other elytrum : the thighs are green, 

 rufous at the base, tibiae rufous, tarsi piceous. 



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