affecting the Turnips, Corn-crops, S^c. 
223 
Bouche's figure of E. niger (fig. 41 ), but whether he be correct I 
cannot determine. I have thought it necessary to give a drawing 
of it, bavin? received specimens with other Wireworms from 
Surrey in August ; and I have met with the same species under 
stones, occasionally, on grassy downs. It is very shining, ochreous, 
and clothed with longer hairs than usual, with a faint channel 
down the back ; the head, first thoracic segment and tail are fer- 
ruginous ; it is not so cylindrical as the common Wireworm ; the 
head is broad and flattened ; the jaws are longish, arched, acute 
and black (fig. ; the first thoracic segment is narrowed behind ; 
the apical segment is somewhat semiovate, with a large oval exca- 
vation, forming a hollow above ; it is rugose, with two longitudi- 
nal channels ; the sides are denticulated, and at the apex are two 
large teeth, generally notched, and separated by a triangular 
fissure ; the underside is tuberculated, and the anal foot is large 
and broad, with a short horny spine on each side (fig. k) ; the six 
pectoral feet are small, but serrated beneath with spines, and ter- 
minated by simple claws. 
In the course of publication of these papers we have seen that 
many insects prey upon one another, and that probably no species 
injurious to agriculture is free from the attacks of parasitic and 
predaceous insects, which, by subsisting upon the mischievous 
multitudes, subdue their numbers and render a most essential 
service to man. I have already alluded to those which live upon 
the Wireworms in the former part of this memoir ; but as I have 
now obtained additional materials, and am enabled to add figures 
of the insects which destroy them, as well as others which infest 
. the click-beetles, I shall describe these valuable little friends of 
the cultivator. 
Thousands of insects, called Carabida:, varying greatly in size, 
from half a line to an inch in length, may be found under stones 
and clods in fields, meadows and gardens, where they secrete 
themselves by day, and sally forth at night to feed upon other 
insects, worms, larvae, &c., which come to the surface at that 
period either to feed or to migrate ; they are consequently emi- 
nently serviceable in reducing the ranks of noxious animals. 
During a drought they retire into cracks in the earth, and to the 
most humid spots, and evidently enjoy the refreshing rains which 
succeed. I have seen the large Carahis glahratus* in mountain- 
I ous districts running about immediately after a thunder-storm, 
each having a tolerably large earth-worm in its mouth ; others, as 
the splendid Calosoma sycop]ianta,\ live entirely upon caterpillars 
in trees ; and there is one which is eminently serviceable by feed- 
' upon the Wireworms — a fact for which I am indebted to a 
* Donovan's Brit. Ins., v. 15, pi. 506, 
" t Curtis's Biit. Ent., iol. and pi. 330. 
I 
