150 



THE CANADIAN ENTOMOLOGIST. 



Plagionotus, Mills. 



The soft-maple borer, P. speciosus, Say (fig. 24), is a most gaudy 

 insect of large size (about an inch in length) and with heavier antennae 



than most of its neighbors. The ground colour is 

 black or nearly so, the legs reddish ; but owing to 

 the dense clothing of yellow pubescence very little 

 of the black is visible. Almost the entire under 

 surface is thus rendered yellow, as are also the legs, 

 the greater part of the head, two short bands on each 

 side of the prothorax, and several cross-bands on the 



elytra. 



Calloides, Lee. 



Includes another large insect, C. nobilis, Harr., 

 black, pubescent, usually decorated on the elytra with a iQ'^ small 

 detached yellow spots, which may, however, be absent. Length, .80-.92 

 in. It is thought to breed in the chestnut. 



Arhopalus, Serv. 

 A. fubninans is said to breed in oak, butternut and chestnut. It is 

 .48 to .72 inch long, black with whitish pubescence forming irregularly 

 defined bands on the elytra and leaving on the prothorax a large central 

 black spot with a smaller one on each side. The thoracic marking alone 

 will thus serve as a ready means of recognition. 



XvLOTRECHUs, Chevr. 

 Includes several species which have the front of the head variably 

 carinate ; they are, for the most part, ornamented with transverse bands 

 of lighter coloured pubescence, somewhat as in Cyllaie. 

 A. Prothorax with four spots of (usually yellow) 

 pubescence. Elytral markings indistinct and 

 not conspicuous. .32-48 

 in qiiadrimaculatus , Hald. 



A A. Prothorax not spotted (except by breaking up of 

 bands), sometimes fasciate with pubescence, 



b. Elytra obliquely truncate at apex, the outer 

 angle spiniform. Sides of prothorax 

 regularly arcuate. .60-. 72 



in sagittatus, Germ. 



bb. Elytra obliquely truncate at apex, but not 

 spiniform. 



