338 SAMUEL H. SCUDDER ON THE 



Aethophlebia singularis sp. nov. PI. 31, fig. 9. 



The single specimen is a nearly perfect wing, broadest in the middle, with the tip lost 

 where it extended beyond the nodule. The straight mediastinal vein is at considerable 

 distance from the nearly straight costal margin and connected with it by straight, trans- 

 versely oblique, mostly simple veins which become more crowded toward the extremity, 

 and where they arise from the scapular vein, which is sinuous and beyond the tip of the 

 mediastinal approaches the margin. The interspace between these two veins is traversed 

 by straight, transverse veins, but the other main interspaces are crossed by oblique and 

 generally straight but sometimes arcuate and always simple cross veins ; the offdioots from 

 the scapular branch and adventitious vein are parallel to each other and equidistant, con- 

 nected by straight, transverse veins in places (and probably everywhere), making quadrate 

 cells in these narrower interspaces. The large triangular space between the middle portion 

 of the externomedian vein (here straight and parallel to the costal border) and the interno- 

 median and adventitious vein is broken by a sinuous, longitudinal vein parting from the 

 externomedian, below which the cross veins are oblique, above, transverse. The anal veins 

 are obscure, excepting the two outer principal ones which are close together, distant from, 

 and sub-parallel to, the internomedian vein. The lower margin is gently convex. Length 

 of fragment, 31 mm., probable length of the wing, 38 mm., breadth, 12 mm. 



Carboniferous deposits of Mazon Creek, R. D. Lacoe, No. 2037. 



Xenoneuridae Scudder. 



The characteristics of this family have already been given by me in my paper on Devo- 

 nian Insects. 1 It agrees best with the family just reviewed, in that the mediastinal vein 

 impinges upon the scapular, and that the latter bears a principal branch with offshoots 

 feeding the tip of the wing. But the externomedian vein is peculiar in being amalga- 

 mated for a considerable distance with the scapular, and then forking considerably and 

 occupying the outer half of the lower margin; while the inner half is equally divided 

 between the internomedian vein with its basally divided, simple branches, and the anal 

 vein crowded against the border. 



Xenoneura antiquorum. 



Xenoneura antiquorum Scudd., Dev. Ins. New Brunsw., 24-29, pi. 1, figs. 5-7. Earlier 

 references will be found there. 

 Devonian beds of St. John, N. B. 



Hemeristixa Scudder. 



Wings elongate, the mediastinal vein simple, terminating on the costal margin beyond, 

 generally far be}'ond, the middle of the wing. The scapular vein throws off an inferior 



1 Anniv. Mem. Bost. Soc Nat. Hist., 1880. 



