242 HANDBOOK OF INVERTEBRATE ZOOLOGY. 



d. The Tibia; about equal to the femur in length, but 

 very slender and of uniform diameter (Fig. 139, t). 

 When at rest it extends downwards and backwards, at an 

 acute angle, from the distal end of the femur, but in the 

 act of leaping it is thrown backwards and the limb 

 becomes straight. 



e. The tarsus, or foot (Fig. 139, tr), is made up of 

 four movable pieces : — 



(i.) The first and longest carries, upon its lower sur- 

 face, three soft pads, w^iich, by their adhesion to foreign 

 bodies, serve as a point of resistance in leaping. 



(ii.) The second joint is much shorter, and carries but 

 one pad. 



(iii.) The third is long and slender, w^ith two curved 

 l)ointed claws, the ungues, between which is a concave 

 sucking disk, the fourth joint or pulvillus. 



f. Note that the first and second pairs of legs are much 

 like the third, but much smaller, and meeting the body 

 at a different angle, to fit them for crawling instead of 

 leaping. 



g. Make a sketch of the third leg, indicating the joints. 

 6. The head. 



The outer or dorsal surface of the head consists of a 

 very broad and long frontal surface which looks forward, 

 iind a much smaller and shorter dorsal occipital area. 



a. The epicranimn forms the covering of the dorsal 

 occipital area (Fig. 130, d'), and then becomes narrow 

 and runs downwards between the eyes and antennae to 

 about the middle of the frontal area, where it again 

 enlarges (Fig. 129, d, d, d), and ends below in a 

 prominent, straight, transverse suture. Along the middle 

 of the occipital area there is a faint line, much more pro- 

 nounced in the young than in the adult, which appears to 



