150 



THE CANADIAN ENTOMOLOGIST. 



Calopus, Fab. 

 C. angustus, Lee, would probably be taken by most 

 beginners for a Longhorn on account of its slender form and 

 brownish colour, which cause it to resemble, in general, cer- 

 tain species of Eiaphidion. The antenna? are almost as long 

 as the entire body. Surface of body brownish, pubescence 

 scant, whitish. Head, including the eyes, about as broad as 

 the prothorax, which is broadest at about one-third from apex, 

 the sides arcuate in front, nearly parallel posteriorly ; the 

 1 » thoracic disk is uneven with a broad ill-defined median im- 



VIL/ pression, punctuation distinct. Elytra at base much broader 

 ^"^" '^' than the prothorax, nearly parallel, slightly broader behind, 

 each with three ill-defined costae. Length, .50-72 inch. Occurs also 

 in the western United States, particularly in mountainous regions. Such 

 specimens as I have met with were found under stones or boards. The 

 form of this insect is shown in fig. 13. 



DiTYLUs, Fisch. 

 D. ccertileiis. Rand., is stout, black with a violaceous tint most 

 evident on the prothorax. Head punctured and rugose, prothorax finely 

 and rather closely irregularly punctured, broadest in front of middle, 

 sides oblique, hardly sinuate to base, which has a raised margin or collar. 

 Median line distinct but not well defined. Elytra finely 

 granulate or shagreened* with short, scarcely visible 

 pubescence ; each with four well-defined and nearly 

 equidistant costse. These costae are but slightly ele- 

 vated, their distinctness being due to the strife bounding 

 them on each side. Length, .48- 75 inch. (Fig. 14.) 



Two other species are found in the Western or 

 Pacific provinces : D. gracilis, Lee, which has a longer 

 thorax (distinctly longer than wide), with less dense 

 punctuation and not noticeably clothed with pubes- 

 cence, and D. quadricoliis, Lee, with a subquadrate '^' ^'^' 

 thorax which is densely punctured, pubescent and opaque. In size these 

 do not differ greatly from D. cxruleiis^ and so far as I have observed 

 them their habits are the same. 



Nacerdes, Schmidt. 

 N. melanura, Linn., is an introduced form abundant in the Atlantic 



*Dr. Horn has erroneously described them as "densely punctate." 



