782 



PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



SPHENOMYLACRIS SINGULARIS, new species. 



Loca^tfij. — Port Griffitli SwitchV)a('k, near Pitt.ston, Pennsylvaniii. 

 Anthracite series; E coal. 



Fig. 92. — Sphenomylacris singularis. 



Length of the front wing, 20 mm. 

 Ilolotyjje.—Ciit. No. 3ST61, U.S.N.M. 



AMBLYMYLACRIS, new genus. 



Front wing twice as long as broad, of nearly kidney-shaped form, 

 with strongly arcuate front margin and very broadly rounded apical 

 border. Humeral angle rounded, not produced into an angle. Costal 

 area triangular, ])road, with bunches of veins issuing radiall}' from one 

 point. Radius greatly developed, arcuate, and continuing to the apical 

 margin, with 6 to 8 more or less branched, pectinately arranged otf- 

 shoots. Media reduced, with but 2 to 3 branches directed forward 

 toward the apical border. Cubitus with about 5 more or less com- 

 pound offshoots occupying the entire free inner margin. Anal area 

 defined by a curved vein, not quite twice as long as high and taking 

 up less than half the inner margin. Anal veins normall}" curved to 

 the inner liorder. 



Type of genus, Ainhlymylacris dintoniana (Scuddcn;). 



AMBLYMYLACRIS CLINTONIANA (Scudder). 



Eloblalfina dlntoniunx Scudder, Bull. U. S. Geol. Surv., No. 124, 1895, p. 66, 

 pi. lY, fig. 1. 



Locality. — Clinton, Missouri. Cherokee shales; Kittanning (Alle- 

 gheny) stage. 



AMBLYMYLACRIS HAREI (Scudder). 



Promylacrls liarei Scudder, Bull. U. S. Geol. Surv.,- No. 124, 1895, p. 48, pi. ii, 

 fig. 3. 

 Locality. — Kansas City, Missouri. Chanute shales; Conemaugh ? 

 stage. 



PROMYLACRIS Scudder. 



A somewhat indefinite genus, the type of which may be regarded 

 as Pro)iiylacrls ovalis Scudder. Front wing probably cordate, with 



