Vicinity of Mazon Creek, Illinois. 



365 



Fig. 40. 



Fig. 46. Melinophlebia analis.' x2 - 7. 



branches that curve toward the apical margin, the first of them 

 being forked. The media apparently forming but one fork, 

 whose branches run parallel with those of the sector. The 

 cubitus runs parallel with the media to the end of the posterior 

 margin and its (about) 5 branches take the same direction. The 

 anal area being limited by a strongly curved furrow extends 

 about one-seventh of the wing length. Cross veins have 

 probably been present but are not now discernible. 



This species shows how a wing of a blattoid type may have 

 been transformed into a termite wing. 



Holotype in Peabody Museum, Yale University, Cat. No. 55. 



Silphion, new genus. 

 Silphion latipenne, new species. Fig. 47. 



Anterior wing 30 mm long, 25 ram only being preserved. Apical 

 half conspicuously enlarged. Anterior margin nearly straight. 

 Subcosta extending a little beyond the middle of the wing, 

 uniting with the costa and giving off but 3 veinlets directed 



Fig. 47. 



Fig. 47. Silphion latipenne. x 2'2. 



obliquely toward the costa. Radius nearly straight and at a 

 moderate distance from the subcosta. Sector rising somewhat 

 before the middle of the wins, with 7 simple and parallel 



wing, 

 branches running toward the apical 



Media forked 



