Ni:\v MAr,i,oi'MA<;A 



151 



from tlie l)Otly. Tlie femur of the mesothoracic leg 

 extends outward also but a little more forward than 

 the other. That of the prothoracic leg is inclined for- 

 ward at an angle of about 45*^ with the body. Hence 

 the fore legs are hi-hl mostly beneath the head and 

 anterior part of the prothora.x. The nieta- and nieso- 

 tibiie extend backward, outward, and downward from 

 the distal ends of the corresponding femora. The pro- 

 tibiie extend backward, inward, and downward from the 



distal ends of the profemora, 

 and their distal ends lie in- 

 ternal to the coxal ends of 

 the femora. 



When the insect is walking 

 undisturbed in forward longi- 

 tudinal progression, the two 

 legs of the mesothorax and of 

 the metathorax move respect- 

 ively together, but the two 

 pairs move in o[tposite direc- 

 tions. That is (figs. 2 and 

 3), the two mesothoracic legs 

 move forward or backward at 

 the same time and the meta- 

 thoraciclegs move in thesame 

 manner, but while the mesothoracic legs are moving 

 forward, the metathoracic legs arc moving backward, 

 and vice versa. Thus, while one pair of legs is pushing 

 the body forward the other pair is reaching forward 

 for a new grasp, and this is obtained just as the active 

 pair has finished it> work. The pair jircviously being 

 carried forward tlicn takes hold and continues the 

 motion of the body, the two being themselves brought 

 relatively backward. In this way the two pairs are 



Ki« 2 



