1920] Du Porte: Muscular System of Gryllus 31 



mesothoracic basalar sclerite. The two bellies enter the coxal 

 cavity where they unite in a common broad flat tendon by which 

 they are inserted into the upper anterior edge of the trochanter. 

 Extensors of the femur; 40a is also an elevator of the tegmen. 

 [76, 81]. 



PLEURAL MUSCLES. 



(a) Pleuro-pedal. 



41. The First {and Second) Lateral Muscle of the Mesothorax 

 (Fig. 21). From the trochantin by tendon into the basalar 

 sclerite. Usually biceps or digastric. Elevator of the tegmen, 

 also elevator of the coxa. [79, 80]. 



40a. The Third Lateral. See above. [81]. 

 • 42. The Fourth Lateral (Fig. 21). From the upper edge of 

 the mesoepisternum, by tendon into the latero-anterior side 

 of the coxa. Extensor of the coxa. [82]. 



43. The Fifth Lateral (Fig. 22). From the episternum near 

 its middle, into (1) the anterior edge of the coxa, (2) the tro- 

 chantin, and (3) the precoxale. Extensor of the coxa. [83]. 



44. The Sixth Lateral (Fig. 21). From the posterolateral 

 edge of the coxa into the subalar plate. Depressor of the 

 tegmen. Flexor of the coxa. [84]. 



45. (See Tergo-sternals above). 



46. (See Sterno-pleurals below). 



(b) Noto-pleural. 



47. The Eleventh Lateral Muscle (Fig. 21). From the 

 anterior side of the pleural wing process into the first inter- 

 segmental sclerite. Probably an elevator of the tegmen. [88]. 



48. The Twelfth Lateral Muscle (Fig. 21). From the 

 posterior side of the pleural wing process into a wing axillary 

 just above the subalar plate. A short strong muscle. Depressor 

 of the tegmen. [89]. 



49. The Ninth Lateral Muscle (Fig. 21). From the posterior 

 face of the entopleurite ventrad of the origin of 48, into the 

 posterior notal wing process. A depressor of the tegmen. [86]. 



(c) Stemo-pleural. 



51. The Lateral Adductor of the Mesothorax (Fig. 20). From 

 the median entosternite into a small pleural intersegmental 

 sclerite behind the second spiracle. [101]. 



