THE CANADIAN ENTOMOLOGIST. 



155 



Fig. is. 



following table will, it is thought, serve for the separation of the Canadian 

 forms among themselves without reference to prosternal characters, for an 

 exposition of which the student is referred to Dr. Leconte's paper on the 

 genus in Trans. Amer. Ento. Soc. for 1880. 



A. Elytra yellow with two oblique black stripes ; 

 prothorax reddish, usually with two basal 

 oblique yellow spots. .17-21 in. (Fig. 



15) Veiiustus, Fabr. 



AA. Elytra spotted. 



b'. Spots numerous, arranged 2, 2, 2, i on each 

 elytron, yellowish on brown or black 

 ground. Prothorax reddish. .16-22 



in guttulatus, Oliv. 



b-. Spots at base confluent into a transverse band which extends to 

 the sixth stria, a marginal spot just before the middle extend- 

 ing to fifth stria, an interrupted post-median band and apical 

 spot, all yellow. Ground colour of elytra brown. Pro- 

 thorax brown. . 1 2-. 1 6 in badius, Suffr. 



bl Spots very different in size, the middle ones usually confluent 

 into a large blotch on the sutural region, the others usually 

 quite small and arranged in longitudinal rows \ they are 

 brown or black on a pale yellow ground. The prothorax is 

 ferruginous or nearly black ; sides and front, and often also 

 two oblique basal spots, yellow. .16-.28 \w.miitabilis^ Melsh. 

 b". Spots red, not exceeding two on each elytron \ ground colour 

 black or blue-black, prothorax black. 



c. Humeral spots confluent on median line so as to form a band 

 extending quite across (var. of next ■s,^zz\&%) .iiotattis, Fabr. 

 cc. Humeral spots separate. 



Larger and more robust ; humeral spot large, extending 

 along sides, apical spot variable in size. .14-22 

 in quadrimaculatus, Say- 

 Smaller and more slender ; humeral spot oblong, slightly 

 wider behind, hardly reaching the base. Apical spot 

 rounded. (The var. 4-gHttulus differs only in having 

 the humeral spot longer, reaching to the middle of the 

 length of the elytra.) .10-12 xn .quadruplex, Newm. 



