THE CANADIAN ENTOMOLOGIST. 239 



resembles axillaris, but only in coloration. To me they are separate 

 species. 



Dorcaschema nignim Say. — This species requires two years for 

 development, breeding in dead hickory limbs, from a barrel of which 

 more than 500 specimens were obtained from June 3rd to 25th. The 

 larvae live under the bark till May of the year in which the beetle 

 appears. As the time for pupation approaches they develop an enormous 

 appetite and eat broad cavities in the wood under the bark through 

 which their dust is ejected by a perforation. Some of them pupate in 

 these cavities in which they partition off a suitable space with a wall of 

 compacted dust ; but the greater number bore obliquely into the wood to a 

 greater or lesser depth and distance and then outwardly again till near 

 the surface, packing their burrows solidly. The larvae do not bore 

 entirely to the outside, but stop short one-eighth to one-sixteenth of an 

 inch, leaving the remainder of the wood and the bark to be cut through 

 by the matured beetles, which are just as capable of boring a hole as the 

 larvae. And in this connection I would state that I have ascertained 

 this season that in the case of Saperda Fayi and S. concolor, the beetles, 

 and not the larvte, bore the holes to escape by. In the pupa state the 

 very long antennae are coiled into a spiral of three and lie on the wing 

 pads. In the development probably one-fourth of the beetles are unable 

 to free the entire antennae from the envelope and appear with one or 

 both deficient in some of the external joints. 



Tymnes metasternalis Crotch. — This species appears to be rare among 

 collectors. Crotch described it from Illinois briefly : " Very similar to the 

 preceding [tricolor, the bronze variety], but elytra more sparesly punctate, 

 subcostal ; metasternum and ventral segments closely and deeply punctate. 

 L. ,22 inch." This season I took twenty-five examples of a form that 

 suits this description well enough, except that in length they measured 

 from .16 to .19 inch, which represents a much smaller insect, but which for 

 the present may bear the name. In tricolor the metasternum is scarcely 

 sparingly punctate and highly polished, and there are scarcely any ab- 

 dominal punctures. This, with the much larger size and more convex 

 form, are sufficient distinctions. With Rhabdoptera picipes Oliv. ( Col- 

 aspis prcetextata Say) it may be very readily, and probably is, often con- 

 founded, as they are nearly of the same size, colour and sculpture, but the 

 underside of picipes is smooth like in T. tricolor and the tibiae are not 



