62 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 



=;6 



PLATE 12 



Fig. 31. Stereoscopic view of the more medially situated indirect muscles 

 of flight. (Magnified 10 diameters. Photographed with Zeiss binocular; Ob- 

 jective 55. Ocular 3.) 



I u 



dvl, Musculus dorso-ventralis primus. 

 dvll, Musculus dorso-ventralis se- 

 cundus. 



In, Air-sac. 



in, Musculus latus. 



mm, Musculus dorsalis. 



Fig. 32. Stereoscopic view of the more laterally situated indirect muscles of 

 flight. (Magnified to diameters. Photographed with Zeiss binocular; Ob- 

 jective 55, Ocular 3.) 



I 



al>, Mesapophysis. 



dvl, Musculus dorso-ventralis primus. 

 dvll, Musculus dorso-ventralis se- 

 cundus. 



di'III, Musculus dorso-ventralis ter- 



tius. 

 ni, Musculus latus. 

 tr. Trochanter muscle. 



