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 ^aliginosus (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 larged. 

 fifty other species of this genus in this country. Most 

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

 ^v ^^^ y, the prothorax nearly square. 

 ^J&/ The beetles of the genus Dicalus (Di-cae'- 



JSKA lus) are quite common ; and some of the larger 

 /J jV s P ec i es resemble Harpalus caliginosus quite 

 ^H|flk closely. They can be distinguished by a prom- 

 j . ^jgjp J j nen t keel-shaped ridge which extends back 

 ,/ \ upon each wing-cover from near the corner of 



FIG. 627. the 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. 6a8. 



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



