106 THE CANADUN ENTOMOLOGIST. 



Two are recorded from our region. They are both rather elongate 



brown insects and separate thus : 



Thoracic impressions deep, elytra finely punctured, third joint of 

 hind tarsi two-thirds longer than wide, emarginate for about one- 

 half its length. Sides of prothorax rounded, somewhat roughened. 



.90-1,10 in agrestis, Kirby. 



Thoracic impressions fainter, elytra coarsely punctured, third joint 

 of hind tarsi about as long as wide, cleft nearly to the base. 

 Prothorax very finely punctured, sides rounded, hardly roughened. 



.94 in obsoletus, Rand. 



These insects are found about lumber piles in the northern and 



mountain regions of North America. C. agrestis is known to depredate 



on pine and spruce. 



Physocnemum, Hald. 



F. brevilineum, Say, is .50-.75 inch long, black, somewhat shining, 

 elytra sometimes bluish or with a faint reddish tinge along the suture. 

 The upper surface is uneven, the prothorax with deep median longi- 

 tudinal impression which is convex at bottom and limited on each side 

 by an elevation, which is smoother than the external thoracic margin. 

 Elytra distinctly closely punctured and ornamented with a few narrow, 

 short, raised white lines ; the median region on each wing-cover is 

 depressed and limited exteriorly by a smoother linear area, which 

 extends from the humerus towards the apex. Thighs suddenly and 

 strongly dilated near their tips. Hind legs very long. The larva is 

 known as an elm borer. 



Rhopalopus, Muls. 



An easily recognized species, R. sangumicollis^ Horn, belongs here. 

 It has been found on cherry trees. Length .6 2-. 7 5 inch, colour black 

 opaque, surface granulate ; prothorax red, tips of elytra sometimes 

 brownish. The thighs are less suddenly clavate than in Physocfietnum, 

 and the tibife are stouter. The extreme shortness of the prothorax will 

 separate it easily from most of its neighbours. 



GoNOCALLUS, Lee. 



Differs from the adjoining genera by the slender thighs. G. collaris^ 

 Kirby, is black, shining, elytra sometimes with metallic lustre or clouded 

 with fuscous, the prothorax red, legs sometimes reddish. The upper 

 surface is punctate, the antennje very slender. Length .35-.47 inch. 



