64 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 56 



PLATE 13 



Fig. 33. Stereoscopic view of the most internal direct muscles of flight. 

 (Magnified 10 diameters. Photographed with Zeiss binocular; Objective 55, 

 Ocular 3.) 



t r p t I p t II 



a, Mesapodema. 



ap, ]\Iesapoph3^sis. 



m, Musculus latus. 



mbl, Musculus abductor alse primus. 



md, Musculus adductor alse. 



m d. 



vip, Musculus pronator alse. 



pti, Processus pteralis thoracis I. 



ptll, Processus pteralis thoracis II. 



st, Stigma anterius. 



tr, Trochanter muscle. 



Fig. 34. Stereoscopic view of the intermediate direct muscles of flight. 

 (Magnified 10 diameters. Photographed with Zeiss binocular; Objective 55, 

 Ocular 3.) 



m g ma 

 m b I , 



i 



m e 1 



a, Mesapodema. 



ma, Musculus anonymus. 



mbl, Musculus abductor alae primus. 



mel, Musculus levator primus. 



mell, Musculus levator secundus. 



mg, Musculus gracilis. 



m s I 



mp, Musculus pronator alae. 

 msl, Musculus supinator alse primus. 

 pd, Processus dactyloformis. 

 ptil. Processus pteralis thoracis II. 

 st, Stigma anterius. 



