. Smithsonian miscellaneous collections. terior angle of coxa (fig. 2)7 A, B, 91). This muscle isthe last of the tergal muscles of the mesothorax; it lies just externalto posterior border of po and is partially visible from median plane(fig. 34) between po and 7/j. The group of mesothoracic muscles attached dorsally on the tergumincludes two segmental branches of the depressor of the trochanter{lo^) which will be described later. When the tergal muscles havebeen removed there is e5cposed a second or outer set of lateral muscleshaving their origin on the pleuron (fig. 37 A). These muscles inclu
. Smithsonian miscellaneous collections. terior angle of coxa (fig. 2)7 A, B, 91). This muscle isthe last of the tergal muscles of the mesothorax; it lies just externalto posterior border of po and is partially visible from median plane(fig. 34) between po and 7/j. The group of mesothoracic muscles attached dorsally on the tergumincludes two segmental branches of the depressor of the trochanter{lo^) which will be described later. When the tergal muscles havebeen removed there is e5cposed a second or outer set of lateral muscleshaving their origin on the pleuron (fig. 37 A). These muscles includethe abductors of the coxa, and the direct muscles of the wing. Thewing flexor {85) of the latter group has already been described as apleuro-alar muscle; the others are pleuro-coxal, with one pleuro-sternal muscle. Ventrally there will be seen also the sterno-coxal mus-cles, or rotators of the coxa, a description of which will logically fol-low that of the tergo-coxal muscles. NO. 2 THORACIC MECHANISM OF A GRASSHOPPER SNODGRASS 63 71b. --Fm Fig. 36.—Leg musculature of Dissosteira. A, posterior view of muscles in proximal part of right fore leg, including coxa(Cx), trochanter (Tr), and base of femur (Fm). B, anterior and ventral muscles of tibia arising in femur and trochanter of leftmiddle leg. C, cross-section near middle of second left tibia, proximal surface of distal half,showing positions of tibial muscles. D, dorsal view of trochanter (7V) of left hind leg, showing anterior and pos-terior coxo-trochanteral articulations (/, g), and levator muscles of trochanterarising in coxa. E, dorsal view of femoro-tibial joint of left middle leg, showing anterior andposterior articulations (/, in), and bases of levator muscles of tibia. F, corresponding view of femoro-tibial joint of left hind leg. 64 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 g2. Anterior rotator of the coxa (figs. 34, 35, 37).—Origin onsternellar lobe of mesosternum (figs. 34, 35) ; extends anteriorly andou
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