270 APPENDIX. 



contracted at base and is more closely affixed to the ab- 

 domen. 



POECILUS, Bonelli. 



P. fraternus. Dark green ; elytra dark greenish-cupre- 

 ous ; palpi and feet piceous-black. 



Inhabits North-west Territory. 



Antennm fuscous ; three basal joints yellowish, and ca- 

 rinated, carina dusky ; thorax slightly margined ; dorsal 

 impressed line extending entirely to the basal edge ; lateral 

 edge regularly arcuated ; basal angles slightly more than 

 right angles ; elytra dark coppery, with a dark green ex- 

 terior margin ; striae impunctured ; interstitial spaces a lit- 

 tle rounded ; beneath piceous-black. 



Length two-fifths of an inch. 



Although the thorax of this insect is not broadly mar- 

 gined, yet the margin is much wider than that of the chal- 

 cites, Helwig, (in Melsh. Catal.) and it may be distinguish- 

 ed from the lucublandus, Knoch, (in the same work,) by 

 the colour of the palpi, &c. 



DYTISCUS, Linn. Lair. 



D. fasciventris. 9 Dark olivaceous-brown ; thorax and 

 exterior elytral margin margined with yellow. 



Inhabits Lake Superior. 



Head darker than the elytra, greenish-back, with a ru- 

 fous transverse frontal spot ; antennas rufous, joints dusky 

 at their tips ; labrum and nasus yellowish ; palpi co- 

 lour of the antennae ; thorax colour of the head, mar- 

 gined all round with yellowish ; a longitudinal impress- 

 ed line, and extremely minute scattered punctures 5 scutel 



