NO. 2 THORACIC MUSCLES OF THE COCKROACH — CARBONELL I9 



ferent parts of the metathorax and coxa, and its different 

 branches insert on a broad common apodemal tendon attached 

 to the proximal angle of the trochanter {lyyT). 



a. Tergal branch (figs. 37 to 44). — Origin on anterior part of 

 the tergum. 



b. Sternal branch (fig, 44). — Short, flat bundle of fibers. 

 Origin on downward-bent flange of the anterior margin of 

 the sternal arm. 



c. Basalar muscle of the fore wing (fig. 45) . — This large bunch 

 of fibers is attached anteriorly to an apodemal tendon arising 

 from the edge of the basalar plate which articulates with the 

 episternum. Corresponds to the promotor-extensor of the 

 hind wing in other insects. 



d. First coxal branch (figs. 41 to 45). — Origin on mesal angle 

 of coxa. 



e. Second coxal branch (fig. 46). — Origin on the anterior wall 

 of the coxa and anterior part of the coxal rim. 



lyS. Posterior coxal depressor of the leg (fig. 40). — Broad, flat 

 muscle. Origin on the posterior wall of the coxa and posterior 

 part of the coxal rim. Insertion on apodemal tendon attached to 

 the posterior part of the proximal end of the trochanter, 



lyg. Anterior coxal depressor of the leg (figs. 46, 47) . — Flat muscle. 

 Origin on anterior wall of the coxa and anterior part of the 

 coxal rim. Insertion on apodemal tendon attached to the an- 

 terior part of the proximal end of the trochanter. 



180. Anterior coxal levator of the leg (fig. 47). — Slender muscle, 

 originates on the anterior wall of the coxa, inserts on apodemal 

 tendon attached to the anterior part of the distal half of the 

 trochanter. 



181. Main levator of the leg (figs. 40 to 43, 46). — From three 

 origins on the posterior and anterior walls of the coxa, its 

 branches converge on apodemal tendon attached to the distal part 

 of the trochanter. 



a. Posterior branch (figs, 40, 41), — Origin on lateral angle of 

 posterior wall of the coxa. 



b. First anterior branch (figs. 42, 43, 46). — Has its origin on 

 anterior part of coxal rim and ridge which limits the meron 

 on the anterior wall of the coxa. 



c. Second anterior branch (fig. 46). — Origin on anterior por- 

 tion of coxal rim. The insertion of J/J (fig. 54) separates 

 this branch from b. 



