490 THE INSECT WORLD. 
the form of a trapezium. The first segment is also horny, and 
of a metallic green. The eighth has a pair of tubercles with 
hooks, of which the larva makes use in ascending and descending 
its vertical hole, like a sweep in a chimney. This hole (Fig. 

Upper-side, Under-side. 
Figs. 531, 532.—Pupa of a Cicindela. 
530) is a foot or more deep. To dig it, the larva employs its 
mandibles and its legs in the following manner: it twists itself 
round, loads with earth the flat surface which covers its head, 
climbs along the chimney by twisting itself into the form of the 

Fig. 533.—Tetracha Klugii. Fig. 534.—Tetracha oxychiloides, 
letter Z, and thus transports its load, as a bricklayer’s labourer 
carries a hod of mortar up a ladder. Arrived at the mouth of 
the hole, it throws to a distance the rubbish with which its head 
is loaded; or, if too heavy, it simply deposits it, pushing it 
