A MERICA X PA LEOZOIC TXSECTS—n.l ND L TRSCIf. 



675 



EURYTHMOPTEHYX, new genus. 



Ill its \vin<4' \'cins this t'oi'in exhibits oreut conforiiiity to the slender 

 winged dictyoiieurids, l)ut ditt'ers in the delieate and rather reg'uhir, 

 sti'aight, and nowhere intersecting cross veins. The wing is long and 

 narrow, almost four times as long as broad, with nearly straight costal 

 margin and gently arcuate posterior border. The subcosta extends 

 about two-thirds the length of the wing and proceeds oblicjuely to the 

 costa. The radius runs nearly parallel with the su])costa and later 

 with the costa, remains simple, and bends somewhat l)ackward before 

 the end. The radial sector arises directly' ))elow the ))ase, l)ut tirst 

 divides in two-thirds the length of the wing into 2 branches, the 

 superior of which forms 3 and the inferior 2 twigs. The long media 

 sends out its isolated anterior branch above the tirst third of the length 

 of the wing, and then separates in about the middle of the wing into 

 a superior dichotomous and one inferior 8-parted branches. The 

 undivided isolated superior branch of th*^ cubitus issues immediately 

 ])ack of the base and stretches in a gently S-shaped curve to the pos- 

 terior border, while the lower branch of this vein sends out backward 

 successively 1 forked and 2 simple ott'shoots. The anal veins extend 

 in curves to the outer margin. 



EURYTHMOPTERYX ANTIQUA, new species. 



Local/tt/. — Pratt mines, near Hirminghani, Alabama. Middle Potts- 

 ville; Pratt group; ( Sew^ell stage. 



Fk;. 4.— EURYTHMOPTERYX ANTIQX'A. 



Length of the wing, 50 mm. Very w^ell preserved. 



Ifolotyju'.—C'Ai. No. 88707, U.S.NaM. 



Family LYCOCERCID^E, new family. 



According to my view, Krongniart described as Lithomanth gold- 

 eiihergi two specitically diti'erent forms, which in the increased branch- 

 ing of the principal veins are sufficientlv distinguished from Lithoman- 

 tis and the other lithomantids. On the other hand, the intercalary 

 venation is preserved, at least in part, as a close network, and recalls 

 that of the dictyoneurids, with which, however, the forms named in 



