THE CANADIAN ENTOMOLOGIST. 151 



Thorax without apical and basal pubescent band. 

 Elytral bands about as broad as their intervals. 

 .32-64 inch. (Fig. 25.) co/otins, Fabr. 



Thorax with apical and basal pubescent band. Median 

 elytral bands angulated or undulatory. .44-84 

 inch undulatus. Say, 



The above table is, in the main, taken from Mr. Leng's synopsis. 

 He adds, regarding widulatus, that there may, for convenience in cabinet 

 arrangement, " two names be retained : fuscjis, Kirby, for the form with 

 the sides of the thorax entirely covered with pubescent blotches and the 

 elytral bands wavy, and i?iterruptus, Lap. & Gory, for the form with 

 the bands greatly obscured by the sprinkling of white hair." As to food- 

 plants, colo?ms is known at attack oak and maple, while undtilatus has 

 been beaten from spruce. The latter is often very abundant on freshly 

 cut pine logs or saw-ed timber. 



Plagithmysus, Motsch. 



This name is substituted for the Neoclytus of the Check List. The 

 prothorax is transversely rugose, and by this character the genus may be 

 readily distinguished from other Canadian Clytini. Mr. Leng separates 

 the species substantially as follows : — 

 A. Middle and hind femora spinose at apex. 



b. Thorax with a longitudinal elevated ridge, rugose at apex, 

 antennte filiform. Thorax with basal and apical bands only 

 of pubescence ; colour reddish brown, posterior two-thirds 

 of elytra and parts of thorax often darker. .28-. 7 6 

 in luscuSi Fabr. 



bb. Thorax with a few distinct transverse rugpe, antennjie thickened 

 toward apex. Blackish ; head, thorax and legs reddish, 

 elytra with straight transverse bands of yellow pubescence. 

 .20-. 70 in erythrocephaliis. Fabr. 



AA. Femora not spinose, antennae filiform, thorax with many strongly 

 elevated but more or less confused transverse rugf^j. 



c. Elytra rounded at apex, the bands yellow (rarely whitish), 

 forming an oval figure at the base of each, behind which 

 are two slightly oblique fascia?. Tip yellow. .48-.80 

 in capviva, Say. 



