long's second expedition. 177 



minute punctures, which are oblique, as if formed by a pointed 

 instrument directed towards the anterior part of the insect, so that 

 the surface before each puncture is a little elevated ; a white line 

 margins the extremity; venter blackish-testaceous; tibia dull tes- 

 taceous. 



Length rather more than two-fifths of an inch. 



This species is closely allied to 0. pusittanob. but the marking 

 of the elytra differs, and the thorax is not so much [270] contracted 

 at base and is more closely affixed to the abdomen. 



POECILUS Bonelli. 



P. fraternus. — Dark green; elytra dark greenish-cupreous; 

 palpi and feet piceous-black. 



Inhabits North-west Territory. 



Antennae fuscous ; three basal joints yellowish, and carinated, 

 carina dusky; thorax slightly margined; dorsal impressed line 

 extending entirely to the basal edge; lateral edge regularly arcu- 

 ated ; basal angles slightly more than right angles ; elytra dark- 

 coppery, with a dark green exterior margin ; striae impunctured ; 

 interstitial spaces a little rounded ; beneath piceous-black. 



Length two-fifths of an inch. 



Although the thorax of this insect is not broadly margined, yet 

 the margin is much wider than that of the chalcites Hellwig, (in 

 Melsh. Catal.) and it may be distinguished from the lucublandus 

 Knoch, (in the same work,) by the color of the palpi, &e. 



[I consider this as a variety of P. lucuhlandus. — Lec] 



DYTISCUS Linn. Latr. 



D. fasciventris. — £ Dark olivaceous-brown; thorax and ex- 

 terior elytral margin margined with yellow. 



Inhabits Lake Superior. 



Head darker than the elytra, greenish-back, with a rufous trans- 

 verse frontal spot; antennae rufous, joints dusky at their tips; 

 labrum and nasus yellowish ; palpi color of the antennae ; thorax 

 color of the head, margined all around with yellowish ; a longi- 

 tudinal impressed line, and extremely minute scattered punctur< s ; 

 scutel [271] yellowish; elytra each with ten grooves extending 

 nearly two-thirds the whole length from near the base; exterior 

 margin yellowish, becoming obsolete at tip; an obsolete spot t wards 



12 



