Vicinity of Mazon Creek, Illinois. 



311 



Anterior wing slender, 25 mm in length, its apical border 

 obliquely rounded. Subcosta shortened, united at its apex 

 with the radius and with the costa. Radius reaching to the 

 apex of the wing, not split; its sector rising at one- fourth of 

 the wing length, giving off 3 simple and arched branches. 

 Media cleft about in the middle of the wing, its anterior main 

 branch uniting for a short distance with the sector, then remov- 

 ing again and forming a terminal fork. The posterior main 

 branch of the media simple. Cubitus strongly S-shaped, with 

 3 or ?4 simple branches, bent to the posterior margin. Anal 

 area long. 



In the posterior wing the sector has 4 simple branches. The 

 media is a long fork, quite independent of the sector. 



Holotype in Feabody Museum, Yale LTniversity, Cat. No. 31. 



Family SOHUCHERTIELLID^E, new family. 



This family is based on a rather incomplete anterior wing, 

 undoubtedly belonging to the Protorthoptera, but differing 

 essentially from all the other types of this order. Protokol- 

 laria alone affords a comparison. 



Schuchertiella, new genus. 

 Schuchertiella gracilis, new species. Fig. 1 6. 



A right anterior wing, reaching about 30 mm in length, only 

 19 mm of which is preserved. The form of the wing seems to 



Fig. 16. 





1L \ -- " _ - " ,,-- 



\- ' ' ^ " " 



Fig. 16. Schuchertiella gracilis (negative of right wing), x 3. 



have been an elliptical one, with slightly arched anterior mar- 

 gin. Costal area moderately broad, the subcosta very well 

 developed, united with the marginal costa by oblique cross 

 veins and certainly not very much shortened. Radius nearly 

 parallel to the subcosta and no farther removed than the sub- 

 costa from the costa. Radial sector rising at about a quarter 

 of the length, splitting about the middle of the wing, probably 



