608 THE PANORPOID COMPLEX, Hi., 



I have already described the venation very fully, and figured 

 both wing's, together with a restoration, it will only be necessary 

 here to correct an error in my original description, and to em- 

 phasise those points which mark tliis type as distinct from both 

 the true Mecoptera and the Paramecoptera . 



Text-fig. 64 shows the preserved portion of the hindwing of 

 this fossil. In my original description (5, p. 188 et seq.) I 

 indicated the presence of a true costal vein, distinct from the 

 anterior margin of the wing, and made this one of the ordinal 

 characters. A further examination of this vein shows me that, 

 like the subcosta below it, it is distinctly a concave vein. Now 

 I think that there can be no doubt that a true costal vein, if it 

 were to occur in any insect, would be a convex vein; seeing that 



C"ib C"! 



Text-Fig. 64. 

 Preserved portion of hindwing of Archipanorpa magnified Till. (Order 

 Protomecoptera, Upper Triassic). (x 3^). Lettering as on p. 535. 



the main veins are alternately convex and concave, and that Sc, 

 next to C, is well known to be concave. I therefore wish to 

 suggest here that a more correct interpretation of this vein is 

 that it is the anterior branch of the original dichotomy of Sc; 

 and that this dichotomy takes place, in this fossil, near the base 

 of Sc, so that the two branches extend nearly parallel to one 

 another until they reach the anterior border. In Text-fig. 64, 

 this new view is indicated by labelling these two veins Sc' and 

 Sc respectively. 



Not quite so much of the forewing is preserved as of tlie 

 hind; but what is preserved is much the same area of the wing. 

 The two wings only differ in their shape, in the much longer and 



