Vicinity of Mazon Creek, Illinois. 



303 



branches, probably the cubitus ; 2 long forked anal veins strongly 

 curved downward ; and 10 simple anal veins, joined together 

 by delicate and irregular cross veins, forming a diffuse network. 



Though this anal area by the somewhat fan-like arrangement 

 of the numerous anal veius recalls the anal areas of more highly 

 specialized orders, there is no support for the opinion that it 

 could be folded. 



I am not able to say to which category this giant species may 

 belong, but it is certainly a Palseodictyopteron. 



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

 22. 



Fig. 6. 



Fig. 6. Scepasma gigas. 



Ameteetus, new genus. 



Ametretus Icevis, new species. Fig. 7. 



A fragment of 37 mm from the base of a ? posterior wing 

 measuring probably about 150 mm . Costa slightly vaulted, par- 

 allel with and rather remote from the subcosta, which gives off 

 oblique simple or forked veinlets in the costal space. The 

 simple basal pieces of the radius and of the medialis are fol- 

 lowed by the cubitus, which is curved downward, splitting into 

 3 branches. Of the 8 anal veins, which I can distinguish, the 

 first, fourth and sixth are forked, the fifth trichotomous, the 

 others simple. I cannot see cross veins. 



