COLEOPTERA. 



521 



(Le'bi-a gran'dis) (Fig. 626). It has been reported more 

 often than any other insect as destroying the Colorado 

 Potato-beetle. 



Galerita janus (Gal-e-ri'ta ja'nus) is still another species 

 that bears some resemblance to the bom- 

 bardier-beetles. But it is much larger, 

 measuring two thirds of an inch in length, 

 and has only the prothorax and legs red- 

 dish yellow, the head being black ; the 

 prothorax is only about half as wide as 

 the wing-covers. 



What is perhaps the most common 

 type of ground-beetle is illustrated by 

 Harpalus caliginosus (Har'pa-lus ca-lig-i- 

 no'sus), which is represented natural size 

 by Figure 627. It is of a pitchy black 

 color, and is one of the most common FIG. 626. 



natural size and en- 



of our larger species. There are nearly urged, 

 fifty other species of this genus in this country. Most 

 of them are smaller than this one, are flattened, and have 

 the prothorax nearly square. 



The beetles of the genus Diccelus (Di-cae'- 

 lus) are quite common ; and some of the larger 

 species resemble Harpalus caliginosus quite 

 closely. They can be distinguished by a prom- 

 inent keel-shaped ridge which extends back 

 upon each wing-cover from near the corner of 

 FIG. 627. th e prothorax. 



The most common of all ground-beetles, in the North- 

 eastern States at least, is Pterosticus lucublandus 

 (Pte-ros'ti-cus lu-cu-blan'dus). In this species (Fig. 

 628) the narrow, flat margin on each side of 

 the prothorax is widened near the hinder angle 

 of this segment. 



FIG. 628. 



The family AMPHIZOID^E (Am phi-zo'i dae) is represent- 



