128 NATURAL HISTORY OR 
colour, except the eyes, which are yellowish. The 
outline of the thorax approaches to a hexagonal 
form ; the surface is thickly covered with deep 
punctures, which run together and render it very 
rough ; the margins are slightly elevated, and there 
is a faint line down the centre. The elytra are 
elongate-oval and very convex, each of them having 
seven longitudinal ridges, which unite at the extre- 
mity : in the bottom of the furrows between these 
ridges there is a row of small tubercles. It inhabits 
Senegal and the coast of Guinea. 
The genus Calosoma is chiefly distinguished from 
the true Carabi, to which it is very closely allied, 
by possessing wings ; by the third joint of the an- 
tennae, which is considerably longer than the others, 
and somewhat sharp on its outer edge ; by the man- 
dibles being destitute of teeth ; and by the form of 
the thorax, which is somewhat transverse, that is, 
wider than long, and equally rounded on the sides. 
The form of the elytra likewise differs, as they ap- 
proach more to a square shape than is usual among 
the carabideous tribes. Both as larvae and in their 
perfect form, these insects prey upon other species 
of their own class. The grubs, which resemble a 
small black worm, take up their abode in the nests 
generally of the processionary moth ( Losiocampa 
Processioned ), and devour the caterpillars in great 
numbers. When in a state of repletion and inac- 
tivity from excessive gluttony, they are sometimes 
attacked and devoured by the smaller individuals of 
