NO. 12 



FLYING APPARATUS OF BLOW-FLY RITTER 



6i 



PLATE II (Continued) 



Fig. 30. Stereoscopic view of the most external (lateral) direct muscles of 

 flight. (Magnified 20 diameters. Photographed with Zeiss binocular; Ob- 

 jective 32, Ocular 3.) 



mbll 



m e I 



m e II 



m s I 



I J Praescutal border. 



mbll, Musculus abductor alas secundus. 



mel, Musculus levator alse primus. 



mell, Musculus levator ala; secundus. 



mp, Musculus pronator alae. 



msl, Musculus supinator alae primus. 



msll, Musculus supinator alee secundus. 



st, Stigma anterius. 



sti, Stigma posterius. 



