THE RHYNCHOPHORA, OR WEEVILS. 191 



rived at its full growth, bores a hole through the shell 

 and drops to the ground, into which it burrows prior 

 to turning into pupa. 



Other species operate in a similar way upon acorns 

 (B. glandium), and the kernels of certain wild Pruni 

 (B. cerasorum, found in the perfect state on birch). 

 The larvae of one of the smallest, B. brassicte, have been 

 observed to live in red galls on the leaves of willows, 

 the formation of which has even been attributed to this 

 insect, though it appears improbable that such could be 

 the case. Another, B. villosus (Plate XII, Fig. 2, head 

 and rostrum sideways, 2), not uncommon on the oak, 

 has been reared from larvae found in galls formed by a 

 Cynips on the leaves of that tree. 



Certain insects of the genera Tychius and Sibynes . 

 the former found chiefly on the vetch and its allies, and 

 the latter in dry sandy places are conspicuous for 

 their dense covering of light-coloured scales, being often 

 beautifully spotted or banded. In the former genus the 

 funiculus of the antennae consists of seven joints, whilst 

 in Miccotrogus, which very closely resembles some of its 

 members, it consists of only six. 



In Orchestes (so named for its jumping habits) the 

 head is very little projecting; the rostrum bent back on 

 the under surface in repose; the eyes are very close on the 

 upper side, and very often contiguous ; and the posterior 

 legs saltatorial, their femora being often enormously 

 developed. It has six joints to the funiculus of the 

 antennae, whilst in the closely allied Tachyerges there 

 are seven. 



Their larvae are elongate, flat, with no tubercles, and 

 mine in the leaves of different trees, eating the paren- 

 chyma. When full grown they enclose themselves in 



