806 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXIX. 



base of the wino- and sends out 3 oblique l)rariches to the apical border. 

 Tlie media stretches obliquely to the inner margin and forms a large 

 fork. After this follow several sloping veins, which I can not interpret. 



c^ Ri 



Fig. 10(1. — Enhoiasmus p.KTifri.ATUs. 



Between the veins, coarse, occasionally reticulate, curved, irregular 

 cross veins are to l)e seen. 



This form may belong to the protorthopteres or to the protoblattoids. 



Ilolotype.—Cai. No. 38819, U.S.N.M. 



ARCHIMASTAX, new genus. 

 ARCHIMASTAX AMERICANUS, new species. 



Locality. — Lemons Coal Bank, near Fayetteville, Arkansas. Mid- 

 dle Pottsville; Lower Coal-bearing shale? 



Fi<is. 1(17, 108. — Archim.\st.\x .\.meri( ani's. 



A fragment, al)out 24 mm. long, of a wing at least twice this length. 

 Costa marginal; costal area wide; subcostawithniany oblique veinlets 

 directed forward, which are united h\ cross veins. The radius sends 



