56 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 



62. Tergal promotor of the coxa (fig. 33 A). — ^The largest muscle 

 of the prothorax. Origin on upper lateral wall of protergum, posterior 

 to lower end of first ridge (c) ; insertion ventrally on the small tro- 

 chantin (fig. 33 A, B, D, Tn). 



<5j. First tergal remotor of the coxa (fig. 33 A). — Origin on lateral 

 wall of protergum mesad of upper end of 62 below ridge /; extends 

 ventrally and posteriorly external to ^g and 60 to insertion on posterior 

 angle of base of coxa (fig. 33 B, C, D). 



64. Second tergal remotor of the coxa (fig. 33 A, B, C, D). — A 

 short muscle arising on lateral wall of protergum (D) beneath ridge i; 

 insertion on posterior angle of coxa (C, D). 



6§. Third tergal remotor of the coxa (fig. 33 A, B, C, D). — A 

 slender muscle arising on protergum (D) in angle between ridges e 

 and h; insertion ventrally on posterior angle of coxa. 



66. First posterior rotator of the coxa (figs. 33 C, D, 35). — Origin 

 on base of sternal apophysis (figs. 33 C, 35, SA) ; insertion on pos- 

 terior angle of coxa. 



d/. Second posterior rotator of the coxa (figs. 33 C, D, 35). — 

 Origin on side of spina (figs. 33 C, 35, iSpn) ; insertion on posterior 

 angle of coxa. 



68. Abductor of the coxa (fig. 33, B, D). — A flat, two-branched 

 muscle arising on inner face of episternum (Eps), the larger branch 

 (68b) dorsally, the smaller branch (68a) in anterior ventral angle; 

 both inserted by a common stalk on outer rim of coxa (D) just before 

 pleural coxal articulation (CxP). 



6p. Adductor of the coxa (fig. 33 C). — Origin on outer end of 

 sternal apophysis (SA), or at union of the latter with pleural apo- 

 physis (PI A) ; insertion on inner rim of base of coxa (Cx). 



The following nine muscles (yo to ^8) pertain to the segments of 

 the telopodite of the prothoracic leg. Three branches of the depressor 

 of the trochanter (//) have their origins within the body. 



yo. Levator of tJie trochanter (fig. 36 A). — Origin dorsally in an- 

 terior part of coxa ; fibers converge to insertion on tendon arising from 

 dorsal lip of base of trochanter. This is the lifting muscle of the 

 telopodite. 



yi. Depressor of the trochanter (figs. 33 A, B, C, 36 A). — A five- 

 branched muscle, two groups of fibers arising in the coxa and three in 

 the prothorax, all converging upon a strong apodeme arising from 

 ventral lip of base of trochanter (fig. 36 A, yiAp) . The coxal branches 

 arise anteriorly (/la) and posteriorly in ventral part of coxa; of the 

 three body branches the first (/ib) arises dorsally on anterior margin 



