AilKUICAN I'ALEOZOir IXSFJ TS—HAXDLIL'SCII. 



773 



vault to the tip of the wing-, its tirst brunch twice forked, the .second 

 simple, the third, foui'th, and lifth furcate, and the last simple. The 

 media proceeds ohlicjuely to the end of the apical l)order and sends out 

 1 forked and 1 simple branch oblicpiely backward t<^ the extremit}^ of 

 the inner margin, besides 1 simple and 2 forked oH'shoots forward to 

 the apical border. The strong-ly arcuate cubitus, with its 4 furcate 

 or simple branches, occupies the central portion of the inner margin. 

 The anal area is more than twice as long as high and takes up about 

 three-sevenths the length of the wing; it contains about S to !♦ veins. 

 Structure leathery. 



STENOMYLACRIS ELEGANS, new species. 



Localiff/. — Sharp ^lountain Gap, mammoth vein, 2 miles south of 

 Tremont, Pennsylvania. Anthracite series; stage ? 



Fig. 78.— STENOMYLACRIS ELEGANS. 



Length of the front wing, 25 nun. 

 IMoti/jje.—Csit. So. 88738, U.S.N.M. 



ACTINOMYLACRIS, new genus. 



Front wing cordate, twice as long as ])road. Costal area short, tri- 

 angular, not extending beyond half the length of the wing; the veins 

 nearl}' all issue from the base. Radius with 5 to 6 branches, the first 

 of which separates into 3 or 4 twigs. Media with 3 to 4 offshoots 

 directed backward to the apical and posterior borders. Cubitus with 

 1 furcate and 2 simple branches. The anal area is shorter than in 

 the preceding genera, less than twice as long as high, and contains a 

 large number (about 10 to 14) of veins. Structure leathery. 



Type of genus, Actitiomylacrls carlxmiun (Scudder). 



ACTINOMYLACRIS CARBONUM (Scudder). 



Mylacris carbonuni ScvovER, Mem. Boston 8oe., Ill, 1885, p. :504, pi. .\xvii, fig. 

 10 (not figs. 6 and 7 ) . 



Locality. — Cannelton, Pennsylvania. Allegheny foiinaiion; Kit- 

 tanning group; roof of the Middle Kittanuing coal. 



