NO. 2 THORACIC MECHANISM OF A GRASSHOPPER SNODGRASS 65 



anteriorly, the other posteriorly ; the others take their origin in the 

 mesothorax. The first and second body branches arise on scutum, one 

 medially the other on lateral margin, both pass into coxa anterior to 

 pleural arm ; the third body branch arises on ventral margin of meso- 

 sternal apophysis. The trochantinal muscles efifect the movement of 

 the telopodite as a whole. 



Fig. 37. — Coxal musculature of the middle leg of Dissosfcira. 



A, general view of pleural muscles, right side, inner view, and bases of sternal 

 coxal muscles. 



B, base of coxa, inner view, showing muscle attachments. 



C, anterior rim of coxa (Cx), trochantin (Tn), and attachments of associated 

 muscles, inner view. 



104. Rcdnctor of the femur. — A sheet of very delicate fibers in 

 posterior part of trochanter, arising in base of latter, inserted on pos- 

 terior rim of base of femur. This muscle is much weaker than the 

 corresponding muscle of the prothoracic leg (fig. 36 A, 72), the femur 

 of the middle leg being scarcely movable on the trochanter. 



705. Anterior levator of the tibia (fig. 36 B, C). — A delicate, at- 

 tenuate muscle arising anteriorly in base of femur ; inserted by a long 

 tendon-like apodeme arising from dorsal end of a slender process 

 from anterior margin of base of tibia (fig. 36 E, iof,Ap). 



