768 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



■VOL. XXIX. 



EXOCHOMYLACRIS VIRGINIANA, new species. 



TjH'al'ify. — Clendeiiiiiii. West Virniniji. Charleston sandstone. 



Fig. 70.— EXOCHOMYLACRIS VIRGIXIANA. 



Length of the front wing, 2(1 nun. 

 IMotype.—O^t. No. 25034, U.S.N.M. 



ORTHOMYLACRIS, new genus. 



Front wing 2 to 2^ times as long as broad, of subcordate outline. 

 Costal area extending one-half to two-thirds the length of the wing. 

 Radius continuing to the apical Ixu'der, with a variously large number 

 of otfshoots branching otf forward. The superior l)ranch either sim- 

 ple or forked, more rarely" strongl}" compound. Media with few veins 

 directed obliquely l)ackward to the apical and inner borders. Cubitus 

 never continuing to the apical margin, with few branches. Anal area 

 very long, at least twice as long as high, and extending two-lifths to 

 one-half the length of the wing, Avitii numerous more or less compound 

 veins. Structure leathery, more or less distinctly cross wrinkled. 



Type of genus, OrthoinyJaci'ls analis^ new species. 



ORTHOMYLACRIS ANALIS, new species. 



Locdllty. — Port Griffith, Pennsylvania. Anthracite series; E coal 

 ( = Freeport stage). 



Fig. 71. — Orthomylacris analis. 



Front wing, 29 nun. long, about 2i times as long as wide. Costal 

 area extending two-thirds the length of the wing: its veins united 

 into about 4 bunches. Radius wdtli 7 branches, the first of which is 



