778 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



GONIO'MYLACRIS, new genus. 



A provisional genus founded on the basal portion of a mylacrid 

 wing, which is distinguished by a strong curve of the subcosta, with 

 the convexity directed anteriorly. The majority of the branches of 

 this vein issue from the base; 8 from the vein itself. The costal area 

 attains at least two-thirds the length of the wing. The radius appears 

 to have had only 3 simple branches. The media separates into 2 main 

 stems, with probably always 3 or 4 twigs. The cubitus also appears 

 to have had but 3 to 4 offshoots. Anal area long and narrow, prob- 

 ably reaching half the length of the wing. Humeral angle very 

 strongly produced. No structure to be seen. 



GONIOMYLACRIS PAUPER, new species. 



Locality. — Sharp Mountain Gap, 2 miles south of Tremont, Penn- 

 sylvania. Anthracite series; stage ? 



Fig. S7. — GONIOMYLACRIS PATPER. 



Pro))able length of the wing, 32 mm. 

 IJol otyj)e. —<^?it. No. 38728, U.S.N.M. 



MYLACRIS Scudder. 



Mylac7'ls anthracop/dla Scudder is to be regarded as the type of 

 this genus. 



Front wing 2 to 2^ times as long as broad, with more strongly arched 

 anterior margin and more slighth" curved inner margin. Costal area 

 wide, triangular, reaching three-fifths to two-thirds the length of the 

 wing, with ray-like veins issuing from the base. Radius continuing to 

 the tip of the wing, with 5 to 6 simple or furcate branches. Media 

 stretching obliquely to the extremity of the posterior margin, with 3 

 to 4 offshoots branching forward and directed toward the apical 

 margin. Cubitus with 4 to 6 more or less branched members. Anal 

 area more than twice as long as high, almost half as long as the inner 

 margin of the wing, and with about 7 to 8 in part branched veins. 

 No distinct structure to be seen. 



Prothorax nmch broader than lono-. 



