304 S. H. SCUDDER ON THE 



the under surface of a right wing (or a cast of the opposite) in which, as in the individual 

 previously described, slight indications of transverse wrinklings may be seen here and 

 there and especially in the scapular area, but there could have been no regular or defi- 

 nite reticulation. 



The species differ from M. Heeri, its nearest ally, in the stronger curvature of the anal 

 furrow, and in the greater width of the anal area but not in its greater abbreviation, as 

 previously stated, the breadth of the area making up for the greater curvature of the 

 furrow ; it also differs, as before stated, in the sinuosity of the scapular vein, the more 

 arcuate line of separation between the mediastinal and scapular areas, and the more 

 crowded branches of all the areas but the internomedian ; the wing as a whole is also pro- 

 portionally broader. 



The new specimen comes from the same bed as the last, and was sent me by Mr. R. D. 

 Lacoe of Pittston, in whose collection it bears the number 2024. It occurs on the same 

 stone as M. carbonum. 



6. Mylacris carbonum now sp. 



PL 27, figs. 6, 7, 10. 



Fore-win o". The greater part of the wing is preserved, but the apical fourth or fifth of 

 the tip is missing as well as a patch along the inner margin from the tip to the anal area. 

 From what remains, the wing had probably a form somewhat like that of M. anthra- 

 cophilum, but was not quite so tapering, the costal margin being a little less convex; the 

 inner margin next the anal area w r as straight. Tbe veins originate from the middle of the 

 win°\ but do not curve at the base. The mediastinal area has, therefore, a basal width of 

 half the wing and extends to beyond the anal, or probably to just about the middle of the 

 wing ; in the humeral portion of the area no veins can be made out, but in the opposite 

 half two compound veins can be seen, the first consisting of a pair of simple veins united 

 basally. the second of a pair of forked veins united basally very near the extreme base of the 

 wing; both of these veins are forked about midway in their course, the outer twice, close 

 together. The scapular vein can only be traced basally to where it begins to curve inward, 

 a little beyond the forked mediastinal vein just described ; it, together with the next vein in 

 close juxtaposition, curves strongly but only for a very short distance, and the curve of 

 the anal furrow would seem to preclude any further continuation of the curve, so that in 

 reaching the base of the wing it must resume its outer course ; beyond this basal curve it 

 is straight and must strike at the apex of the wing, though it cannot be traced throughout ; 

 in the fragment it has five equidistant branches, and probably has a couple more before 

 the tip ; the third of these is forked not far from the base, but all the others, so far as 

 seen (excepting the first) are simple and straight, although very long, for the straight 

 main vein runs sub-parallel to the costal margin scarcely above the middle line of the 

 wing ; the first branch, however, differs from the rest ; it originates where the main vein 

 begins its straight course, and continues the direction of the deflected basal part of the 

 vein, and emits from its apical side three long, straight, equidistant offshoots, the first from 

 its very base, the last half way to the margin. The externomedian runs in a straight line 

 scarcely below the middle of the wing and first divides a little before the middle, and in 



