602 EXTERNAL ANATOMY OF INSECTS. 



cesses internally concave, which both apply exactly 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 a . 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 orismologi- 

 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 b . 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- 

 delidde have elytra without striae or furrows, while the 

 majority of the subsequent terrestrial tribes of this sec- 

 tion are distinguished by them : the Dynastidce 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 Apian 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 (Edemera, 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 



■ Oliv. Ins. No. 97. Cassida, t. i. /. 10. 

 b See above, p. 39/ — . 



