600 EXTERNAL ANATOMY OF INSECTS. 
to each other, so as together to form a single horn which 
rises, like a mast from a ship, from the body of the ani- 
mal*, Besides the appendages here mentioned, the 
elytra exhibit a variety of tubercles and other elevations 
of various form and size, which it would be endless to 
particularize. 
7. Sculpture. The sculpture of the organs in question 
is very various and often very ornamental: but as al- 
most every kind of it will be noticed in the orzsmologi- 
cal tables, it will not be necessary to enlarge upon it 
here, especially since I have endeavoured upon a former 
occasion to explain how it may be useful and important 
as well as ornamental to the animal. I shall therefore 
only notice a few instances, amongst many, in which 
a particular kind of sculpture distinguishes particular 
tribes. Amongst those that are Predaceous the Cicin- 
delide have elytra without strize or furrows, while the 
majority of the subsequent terrestrial tribes of this sec- 
tion are distinguished by them: the Dynastide in the 
Lamellicorn section are remarkable for a single cre- 
nated furrow next the suture; in the weevil tribes the 
numerous species of the genus Apion are ornamented by 
furrowed elytra with pores in the furrows, which give 
them the appearance of neat stitching ; in many of those 
beetles that have soft elytra, as the glow-worms (Lam- 
pyris), the blister-beetles (Cantharis, Mylabris), and still 
more in Gidemera, two or three slight ridges generally 
run longitudinally from the base to the apex, and are 
visible also on the under-side ; as the furrows probably 
lighten a hard elytrum, these ridges may serve to 
* Oliv. Ins. No. 97. Cassida, t. i. f. 10. 
” See above, p. 396—. 
