328 SAMUEL H. SCUDDER ON THE 



convex costal margin, and in the much greater length of the mediastinal vein, which in 

 G. lithanthraca scarcely extends beyond the middle third of the wing, while here it does 

 not stop much short of the tip. Probable length of wing 30 mm., its breadth, 8.25 mm. 

 Carboniferous beds of Mazon Creek (Mr. R. D. Lacoe No. 2046). 



Genopteryx lithanthraca. 



GfryllOcris lithanthraca Gold., Palaeontogr., iv, 24-27, pi. 4, figs. 1, 2. 

 Carboniferous deposits of Fischback and Rushiitte near Saarbriicken, Germany. 



Cheliphlebia (xi^. <|>k«'P«>v) gen. nov. 



A large coarse-winged group, with tolerably slender form, indicated by the position of 

 the wings in repose and marks on the stone too vague to be well represented. The wings 

 are elongated with sub-parallel borders, have a scarcely arcuate costal margin and variable 

 tip, and cross veins, unless exceedingly feeble, entirely absent. The mediastinal vein is 

 short, terminating before the middle of the wing. The scapular vein being distant from the 

 margin, though tolerably straight and supplying many oblique branches to the same, 

 reminds one of the species last mentioned. The externomedian veins are few, distant, 

 simple or compound, and terminate mostly on the apical margin ; while the internomedian 

 vein extends far towards the extremity of the lower margin parallel to the externome- 

 dian branches, and feeds all that margin with transversely oblique, curving branches. 

 This feature, most conspicuous in the first of the species, has suggested the generic name. 



Cheliphlebia carbonaria, »p. nov. PI. 30, fig. 8. 



The winy: is about three times as lony: as broad, uniform in breadth over most of its 

 extent, with a very broadly rounded tip. The middle third of the lower margin is almost per- 

 fectly straight, giving a stiff appearance to the wing, which seems to be largest beyond the 

 middle; the veins are very pronounced. The mediastinal branches are very different from 

 those of the rest of the wing, being feeble, crowded and arborescent. The internomedian 

 branches, which are distant, are pretty strongly curved, their convexities toward the 

 tip of the wing, and especially curved when, toward the margin, they fork in a claw-like 

 fashion. The anal veins are few in number and more longitudinal than the internomedian 

 branches. Length of wing, probably, 38 mm., breadth 13 mm. 



Carboniferous nodules of Mazon Creek, 111. (Mr. R. D. Lacoe, No. 2034.) 



Cheliphlebia elongata. sp. nov. PI. 29, fig. 7. 



The wing is probably about three and a halt' times longer than broad, broadest in the 

 middle, and beyond that regularly tapering to a prolonged and probably somewhat pointed 

 tip; the veins are obscure. The mediastinal branches seem to be few, distant and simple. 

 The externomedian branches differ considerably on the two front wings, being of the usual 

 type on one side, but more or less arborescent on the other, the subordinate branches fork- 

 ing more than the more important ones. The internomedian branches, which are not 

 distant, are rather gently curved, with their convexities away from the apex of the wing. 



