NO. 12 



FLYING APPARATUS OF BLOW-FLV RITTER 



57 



PLATE 9 (Continued) 



Fig. 26. Stereoscopic view of the left wing-joint from below. (Magnified 

 40 diameters. Photographed with Zeiss binocular; Objective a.-, Ocular 3.) 



gi laa Iba lam llbm Hap 



1 \l„l, \\ 



at, Anterior transverse vein. 



e, Episternum. 



gi. Marginal vein. 



pe, Parepisternum. 



pti, Processus pteralis alse i. 



pto^ Processus pteralis alse 3. 



ptIII, Processus pteralis thoracis III. 



ptIVj Processus pteralis thoracis IV. 



ptV, Processus pteralis thoracis V. 



ptVI, Processus pteralis thoracis VI. 



ptB, Pterale B. 



ptC, Pterale C. 



re, Remigium. 



sq, Squamula. 



t, Tegula. 



V, Stay. 



laa, First depressed (concave) fold of the anterior region. 



Iba, Crest of first raised (convex) fold of the anterior region. 



lam. First depressed (concave) fold of the middle region. 



Ilbm, Crest of second raised (convex) fold of the middle region. 



I lap. Second depressed (concave) fold of the posterior region. 



