affecting the Corn- Crops. 
107 
are particularly destructive, because they eat the outside of the 
grain, and, passing from one to another, they injure as much or 
more than they consume. They do the greatest mischief at the 
end of winter, when they are full grown, and are about 8 lines 
long and 1 line broad : the body is whitish, composed of 12 
segments, distinct enough and rough, with short scattered hairs : 
the head is hard, scaly, black, and furnished with 2 curved sharp 
horny jaws : the three thoracic segments of the body bear each a 
pair of short scaly legs, and a pair of obscure spots ; the anal 
segment is terminated by two very horny hooks (fig. 27 ; n, the 
natural length). They enter the earth or bury themselves in dust 
to become pupae, of which I have no description. 
The beetle belongs to the Family Trogositid^e and the 
Genus Trogostta. Linnaeus was well acquainted with this 
species, which he named 
12. T. Mauritanicus, and it is the T. carahoides of Fabricius 
(fig. 28). It is 4 lines long and 1| broad (fig. o), depressed and 
regularly punctured, of a pitchy colour, with a shade of chestnut; 
the antennae are rather short, remote, and inserted in a deep cavity 
before the eyes; they are clavate, slightly pubescent, and 11- 
jointed ; basal joint stoutish, 2nd minute, 3rd a little oblong, the 
remainder increasing in diameter, 3 or 4 of the terminal ones 
forming a compressed club, a little produced internally, the apical 
joint suborbicular ; the mouth is furnished with an upper and 
under lip, 2 strong bifid jaws, black at their tips and meeting in 
front, 2 ciliated maxillae and palpi, which are subferruginous : 
head broad, semi-orbicular, hollowed on the crown : eyes small, 
black, lateral, and not touching the thorax, which is broader than 
the head, semi-orbicular, broadest before, rounded at the base, 
the sides slightly margined, anterior angles produced and in- 
curved, posterior acute ; scutellum small, semi-ovate ; elytra 
broader than the thorax, from which they are separated by a 
narrow neck and nearly thrice as long, elliptical, a little narrowed 
towards the base, with 9 delicately punctured striae on each, the 
interstices punctured and transversely scratched ; wings ample ; 
6 legs short, anterior pair the stoutest ; thighs very short and 
stout ; shanks short, compressed, dilated at the apex, especially 
the anterior, with 2 minute teeth at the outer and 2 curved spurs 
at the inner angle ; tarsi as long as the tibiae and 4-jointed, ciliated 
beneath, first 3 joints short, 4th long and clavate ; claws strong 
and curved. 
The beetle is carnivorous, and makes some amends for the 
mischief it had done in its larva state, by destroying the Tinea 
yranella, and it is not yet known where the female deposits her 
eggs. 
Having now by descriptions and illustrations enabled the 
