,1 MERK 'A N PA L EOZOIC INSECTS— HA NDIJRSCIL 



697 



cul^itus is long", continued in a gently S-shaped curve, and sends out ^ 

 simple offshoots obliquel}' backward. The few anal veins are gently 

 arcuate. Hind wing with a large anal area, limited by a straight fold, 

 radial sector 3-branched and media simpl}' furcate; its cubital vein is 

 more strongly arcuate and the branches extend in part to the apical 

 margin, in part to the anal furrow. Cross veins not very distinct, 

 oblique in the costal area, elsewhere more perpendicularly arranged. 

 The prothorax is long and narrow, the head rather large and seem- 

 ingly prognathous, with moderately developed compound eyes. Middle 

 and hind legs appear far removed from one another and are long and 

 stout. 



SPANIODERA AMBULANS, new species. 



Locality. — Mazon Creek, near Morris, Illinois. Pennsylvanian; 

 Kittanning^ (Allegheny) stage. 



Length of the entire insect, 48 mm. Lenoth of the front winp', 

 35 nmi. 



Holotype.—Q%i. No. 88S1T, U.S.N.M.. 



GYROPHLEBIA, new genus. 



Very similar to Spanlodera. Costa nearly straight. Sul^costa con- 

 tinued farther toward the tip of the wing. Radius simple. Radial 

 sector originating near the base, with 3 branches directed ))ack- 

 ward. Media (;') not forked. Cubitus arcuate, with 4 branch(\s 

 extending obliciuely to the iimer margin. Anal \eins similar to those 

 in S2)((n!od<'ra. 



Prothorax long; head somewhat prognathous, anteniuv long and 

 slender; front legs shorter; middle and hind legs longer, all only in 

 part preserved and therefore not to be described in detad. 



GYROPHLEBIA LONGICOLLIS, new species. 



"Near CheUphh'bia" Scudder, Mem. Boston Soe-., Ill, 1885, p. .'^29, pi. xxx, 

 lig. 7. 



Locality. — Mazon Creek, near Morris, Illinois. Pennsylvanian; 

 Kittanning? (Alleghen}^) stage. 



Flli. JG. — (lYRorHLEBIA LOJiGICOLUS. 



Length of the entire insect, 40 mm. 



