NO. 2 THORACIC MUSCLES OF THE COCKROACH — CARBONELL I3 



168. First phragmal muscle of the cpistermmi (figs. 29, 30). — Short, 

 flat muscle inserted on the anterior edge of the episternum, 



- . slants inward to the medial part of the phragma. 



log. Second phragnml muscle of the episternum (figs. 29, 30). — 

 Much weaker than 108. Its insertion on the episternum lies 

 close to that of 108, but the muscle slants outward to the lateral 

 part of the phragma, 



no. Dorsal longitudinal muscle (fig. 23). — Flat bundle of fibers that 

 extends along the median line from first to second phragma. 



111. First oblique dorsal muscle (figs. 22, 23). — Small, triangular 

 muscle going from median portion of second phragma to median 

 line on the tergum. 



112. Second oblique dorsal muscle (fig. 22). — Broad, flat muscle 

 going from second phragma to tergum. 



1 1 J. Third oblique dorsal muscle (fig. 22). — Broad, flat muscle, 

 going from lateral portion of the second phragma to the tergum. 



114. Tergo-pleural muscle (figs. 22, 23, 24). — From the tergum, goes 

 downward to the upper surface of pleural ridge. 



115. Pleuro-alar muscle, flexor of the wing (figs. 22, 23, 24, 25). — 

 Arises from the under side of the pleural ridge, goes dorsally 

 to its insertion on the 3rd axillary (fig. 21, sAx). 



116. Tcrgo-plcural muscle (figs. 22, 23, 24, 25). — Broad bundle of 

 short fibers going from a broad insertion along the anterior edge 

 of pleural ridge and pleural arm to the downward-bent part 

 of the anterior notal wing process which articulates with the 

 first axillary {lAx in fig. 21). 



11/. Pleuro-sternal muscle (fig, 25). — Broad, short muscle, from 

 the anterior edge of the pleural arm to the anterior edge of 

 the sternal arm. 



118. First tergal muscle of the trochantin (figs. 22 to 28). — Power- 

 ful muscle, from a broad origin on the anterior edge of the ter- 

 gum, goes tapering backward and downward to its insertion on 

 the surface of the first plate of the trochantin (figs. 33, 34, 

 iTn) very close to the articulation with the coxa. 



up. Second tergal muscle of the trochantin (figs. 22 to 28). — Origi- 

 nates on the anterior part of the tergum, inserts on apodeme on 

 the edge of the first plate of trochantin. 



120. Third tergal muscle of the trochantin (figs. 22 to 28). — Origi- 

 nates on the tergum posterior to up, goes to apodeme on the 

 edge of the first plate of trochantin. 



121. Phragmal muscle of the basisternum (figs. 28, 29). — Narrow 

 muscle ; origin on the lateral portion of the phragma ; goes 



