308 s - II. SCUDDER ON THE 



more fully rounded apex, and the considerably greater extent of the mediastinal area ; 

 the veins of the anal area are less crowded and less regular than in M. c trbonurn, and the 

 externomedian branches are superior instead of inferior ; hence it agrees better with M. 

 anthracophilum, but the externomedian vein lacks the basal branch found there and the 

 anal veins are not so regularly disposed ; the much less strongly curved costal margin is 

 dependent upon the basal breadth of the wing, already mentioned. 



The specimen figured is numbered 2031 a. in Mr. Lacoe's cabinet, and its reverse 

 No. 2031 b. It comes from Cannelton, Penn. 



9. Mylacris Mansfieldii. 



Mylacris Mansfieldii Seudd., Mem. Bost. Soc. Nat. Hist., in. 4 7. pi. -3, fig. 15. 

 Cannelton, Penn. 



10. Mylacris ovale nov. sp. 



PL 27, fig. ft. 



Fore-wing. The anal area and the extreme base of the wing is absent, but the larger 

 part of the wing is entire with perfect margins except an unessential fragment, showing 

 the wing to have been a little more than twice as long as broad, very regularly oval, with 

 similar and symmetrical costal and inner margins and a rounded subacuminate tip. It is 

 peculiar for the basal narrowness of the mediastino-scapular area. The mediastinal area 

 is very small though reaching beyond the middle of the wing for next the base it is not 

 more than one-fifth the width of the wing and begins to narrow opposite the end of the 

 anal furrow; its veins are only two or three in number, simple or forked, very g ntly 

 arcuate and subparallel, the limitation between the mediastinal and scapular areas being 

 arcuate in a sense opposed to that of the anal farrow. The scapular vein has a consider- 

 ably arcuate course throughout ; starting so as to be fairly within the upper fourth of the 

 wing, it curves first downward and then upward with a regular sweep which includes two- 

 fifths of the wing in the middle, and terminates just above the apex of the wing ; it emits 

 in this specimen four brandies, gently arcuate in the same sense, simple, singly or doubly 

 forked, all but one of which are thrown off in the basal third of the wing, not very far 

 apart. The externomedian vein has an arcuate course in the same sense as the preceding, 

 running in the outer half of the wing subparallel to the inner margin ; it commences to 

 divide before the end of the anal area and emits four inferior equidistant branches, the 

 last opposite the end of the mediastinal area, the extreme ones simple, the middle ones 

 simply or doubly forked, all considerably curved in the same sense as the main vein, at 

 least at their base. The internomedian vein curves again in the same sense, taking no 

 curve toward the inner margin until close to the tip. and reaching the margin farther from 

 the apex of the wing than the scapular vein, so that the largei part of the externomedian 

 area is below the apex; it emits half a dozen or more very long, simple, or simply forked 

 vein-, all arcuate in the same sense, though more gently; three of them arising near the 

 base far within the tip of the anal furrow, three other near the middle of the wing at no 

 very great distance apart, and probably au apical one. The anal furrow is lightly im- 

 pressed, very slightly arcuate and probably terminates before the end of the basal third 

 of the wing. No anal veins are preserved. 



