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 
Harpains 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 V\G.t^.—Lebia grandis, 
* 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 
the prothorax nearly square. 
The beetles of the genus Diccelns (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. 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. 628. 
The family Amphizoid^e (Am phi-zo'i dm) is represent- 
