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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 56 



5. The supinator alee primus (text fig. 7, pi. 11, fig. 30, pi. 13, 

 fig- 34; fnsi). This muscle is delta-shaped. It arises from the 

 episternal pouch and passes into a tendon which, as mentioned 

 above, is united with the tendon of the levator secundus. It passes 

 beyond the pterale A, where the levator secundus is inserted, and 

 into the anal ligament. 



6. The supinator alee secundus (text fig. 7, pi. 11, fig. 30; msll). 

 This muscle is likewise delta-shaped. It arises at the apodema, 

 behind the supinator primus, and is continued in a long tendon 

 which traverses the foramen postalare, and is joined to the liga- 



m e I 



m s I 



m s 



Fig. 7. Diagrammatic view of the direct muscles that lie more laterally. 

 (Median section of the thorax.) 



a, Mesapodema. 



d, Processus duplicatus (Pterale A). 



ma, Musculus anonymus. 



mbll, Musculus abductor alae secundus. 



mel, Musculus levator alse primus. 



mp, Musculus pronator alse. 



msl, Musculus supinator ate primus. 



msll, Musculus supinator alas secundus. 



0, Foramen prsealare. 



Oi, Foramen postalare. 



pd. Processus dactyloformis. 



pe, Parepisternum. 



pn, Parapterum. 



ptil, Processus pteralis thoracis II. 



ptIV, Processus pteralis thoracis IV. 



sti, Stigma posterius. 



mentum anale near the processus pteralis thoracis VI and the 

 processus alse 4. 



7. The abductor alee secundus (text figs. 6, 7, pi. 11, fig. 30; 

 mbll). This is the strongest of the direct muscles. It lies under 



