BY A. JEFFERIS TURNER. 



345 



(except in one very abnormal example). Sometimes one is 

 tempted to imagine that the base of vein 1 1 has disappeared, and 

 that the long bar represents part of that vein after anastomosis 

 with 12; but an examination of a series of specimens will show 

 that this is not the case; the bar is merely an anastomotic union, 

 iX _ _^_^,^ «2 ^^^^^ n 



lli-io 'K "L- ll-f'o 



Fig. 7. Fig. 8. Fig. 9. 



which has become lengthened out. When 10 and 11 are com- 

 pletely coincident, they may anastomose with 12, as in Fig. 8; 

 or by a bar, as in Fig. 9. These six figures represent all the 

 varieties present in the great majority of species. But, occasion- 

 ally, a puzzling variety occurs as in Fig. 10 {Jj. suasaria); here 

 12 _, a 



10 

 Fig. 10. Fig. 11. Fig. 12. 



11 arises apparently from 12, and is not connected with 10. 

 Fortunately the neuration of the other forewdng of the same 

 specimen. Fig. 1 1 , explains the anomaly. Here the oblique con- 

 necting bar just touches the bifurcation of 10 and 11; in the 

 abnormal wqng, the connection has not developed, and the oblique 

 bar has captured the origin of vein 11, which is now in two dis- 

 connected pieces, the basal portion being fused with 10. I have 

 three examples of the new species, B, nyctoj^ora, which are even 

 more instructive. In one 9, 10 and 11 are long-stalked and 

 free, as in Fig. 4; in one $, they are connected with 12, as in 

 Fig. 7, except that the bar is short; but, in another ^, the neu- 

 ration is of the type of Fig. 10, veins 11 and 10 being more closely 

 approximated but not connected. In the other fore wing of the 

 same ^, 10 and 11 are long-stalked; after their division, 11 

 almost immediately runs into the connecting bar with which 10 

 anastomoses a little further on; later, the two veins again separate 

 (Fig. 9). This abnormality clearly demonstrates the correctness 

 of my interpretation of figures 7, 10, and 11. 



