20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO7 



182. Anterior coxal levator of the leg (fig. 40). — From different 

 origins on the posterior wall of the coxa, its four branches con- 

 verge to an apodemal tendon attached to the trochanter very 

 closely to that of 181. 



a and h. (fig. 40). — Origin on posterior wall of coxa. 

 c and d. (fig. 40). — Origin on posterior part of coxal rim. 

 Numbers 18^ to 188 have been left for the muscles of the rest of 



the leg. 



The following muscles, going from the metathorax to the abdominal 



sclerites, must be considered intersegmental. 



i8q. Spino-sternal muscle (fig. 54). — Very slender bunch of ex- 

 tremely long fibers going from the second spina to the second 

 abdominal sternum. 



190. Tergo-sternal muscle (figs. 38, 39). — From the upper surface 

 of the sternal arm to the first abdominal tergum. 



ipi. Oblique ventral muscle (fig. 54). — From the base of the sternal 

 arm to the anterior edge of the first abdominal sternum. 



ip2. First longitudinal ventral muscle (fig. 54). — From the under 

 surface of the sternal arm to the anterior edge of the first ab- 

 dominal sternum. 



ipj. Second longitudinal ventral muscle (fig. 54). — Two branches 

 having their origin on both sides of 190 converge to form a 

 single flat muscle which goes backward overlapping 192 to in- 

 sert on the anterior edge of the second abdominal sternum. 



LITERATURE CITED 



Snodgrass, R. E. 



I. 1927. Morphology and mechanism of the insect thorax. Smithsonian Misc. 



Coll., vol. 80, No. I, pp. 1-108. 

 II. 1929. The thoracic mechanism of a grasshopper, and its antecedents. 

 Smithsonian Misc. Coll., vol. 82, No. 2, pp. i-iii. 

 III. 1935. Principles of insect morphology. McGraw-Hill, New York. 



ABBREVIATIONS USED ON THE FIGURES 



For numbers of the muscles refer to part II (list of muscles). 

 Ax, axillaries. lAx, first axillary; 2 Ax, second axillary; sAx, third axillary. 

 Ba, basalare, basalar plate. 

 Bs, basisternum. 

 Cv, cervical plates. iCv, first cervical ; 2Cv, second cervical ; sCv, third cervical ; 



4Cv, fourth cervical. 

 Cx, coxa. 

 Epm, epimeron. 



Eps, episternum. lEps, first plate of the episternum; 2Eps, second plate of the 

 episternum. 



