NO. 12 



FLYING APPARATUS OF BLONV-FLY — RITTER 



41 



PLATE 2 (Continued) 

 Fig. 4. Stereoscopic view of the lateral wall of the thorax from within. 

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

 Ocular, 3.) 



s p P t I 



pd s O ,y 



a, Mesapodema. 



e, Episternum. 



ep, Epimerum. 



es, Mesosternum. 



I, Prsescutal border. 



/i, Episternal border. 



0, Foramen pra;alare. 



o^, Foramen postalare. 



p, Prsescutum. 



pd, Processus dactyloformis. 



pe, Parepisternum. 



pm, Parepimerum. 



pn, Parapterum. 



pp, Parapleurum. 



pti, Processus pteralis thoracis I. 



ptil. Processus pteralis thoracis II. 



ptIII, Processus pteralis thoracis III. 



ptIV, Processus pteralis thoracis IV. 



ptV, Processus pteralis thoracis V. 



s, Scutum. 



se, Scutellum. 



sp, Spina scutalis. 



st. Stigma anterius. 



sti, Stigma posterius. 



