700 



I'ROCEEDIXat^ OF THE NATIONAL MWEUM. 



VOL. XXIX. 



METRYIA, ne\^' genus. 



Front wing' of a form similar to that in Diecoveura^ but .somewhat 

 less slender. The marginal costa not vaulted. Subcosta reduced. 

 Radius simple, reaching to the tip. Sector issuing near the base and 

 divided into 2 dichotomous branches below the middle of the wing. 

 Media probal)ly simple. Cubitus apparently forming a large cui»ve, 

 from which one simple offshoot, then 2 forked ones, and finally one 

 more simple, short branch run oil' successively ))ackward. Anal area 

 with 2 compound and 1 simple veins. Cross veins preserved only on 

 the costal border. 



METRYIA ANALIS, new species. 



Locality. — Mazon Creek, near Morris, Illinois. Pennsylvanian; 

 Kittanniugi (Allegheny) stage. 



Fig. 27.— Metryia analis. 



This large wing, 34 nmi. long, most probably belongs to a spanioderid 

 form, although the cubitus appears to be somewhat difi'erently con- 

 structed than in the other genera of the group. 



Holotype.-^Q^t. No. 38834, U.S.N.M. 



Family CEDISCHIID^E, new family. 



A numlier of the protorthopteres are charactenzed by the fact that 

 the superior branch of the media of the front Aving coalesces with the 

 radial sector, and later again furcates to continue on apparently as an 

 ofi'shoot of the latter vein. In one of the previously discovered forms 

 of this group, the hind legs are preserved and are developed as legs 

 for jumping (as in locustids). 



This group is represented in Europe and America. 



GENENTOMUM Scudder. , 



GENENTOMUM VALIDUM Scudder. 



Genentomum mlklum Scudder, Mem. Boston Soc, III, 1885, p. 329, jdI. xxx, 



figs. 2, 3. 

 QiJdischia valida Brongniakt, Faune ent. terr. prim., 1893, p. 559. 



Locality. — Mazon Creek, near Morris, Illinois; Pennsylvanian; 

 Kittanning 'i (Allegheny) stage. 



