302 S. H. SCUDDER ON THE 



one-fourth of the wing ; they diverge from a point before the base of the wing and are 

 very straight and fork somewhat — just how much the preservation does not permit 

 one to say. The scapular vein passes in a very straight course down the middle of the 

 wing with a slight obliquity from above downwards in passing distalry, but probably 

 terminates at the apex ; it emits a number (4 or 5 are preserved in the fragment) of 

 straight, approximate, so far as we can see simple, branches parallel to the mediastinal 

 veins. The externomedian vein is slightly arcuate, but otherwise parallel to and equi- 

 distant from the scapular, forks before the middle of the wing, each of these branches 

 again forking, but not widely ; in the part lost they probably branch more but can hardly 

 occupy much space on the border. The internomedian vein is gently and uniformly arcu- 

 ate and probably terminates where the inner margin begins to curve considerably toward 

 the tip ; in the basal half of its course it emits four or five simple, occasionally simply 

 forked branches, more faintly traced than the other veins of the wing and which curve 

 gently in an opposite sense to the main stem. The anal furrow is slight and faintly 

 impressed, gently and regularly curved throughout, terminating probably at the middle of 

 the wing; the anal veins are not preserved. 



The species is a large one, the fragment being 22 mm. long, while the entire wing can 

 hardly have been less than 33 mm. long, and its breadth, which is preserved, is 15 mm., 

 making the breadth to the probable length as 1 : 2.2. The veins are slightly elevated and 

 distinct and regular. There appears to be no reticulation or cross venation whatever, and 

 the surface of the shoulder of the wing is particularly smooth. 



The species appears to be most nearly allied to M. Heeri, but it is much larger than it, 

 or, indeed, than any other species of the genus except the preceding, and its anal furrow is 

 even more longitudinal and less arcuate than in M. Heerl ; it differs also from the hitter in 

 the much greater number and closer approximation of the mediastinal nervures and in the 

 downward sweep of the externomedian veins, probably causing the area to occupy the 

 margin wholly below the apex of the wing. In the stout square humeral lobe of the wing. 

 in which the veins are obliterated, it seems to be peculiar, as it is also in the regularity of 

 the curve of the anal furrow. 



The single specimen upon which the species is based was found by Mr. It. D. Lacoe at 

 Port Griffith Switchback, near Pittston, Penn., and bears the No. 2017 in his collection. 



5. Mylacris pennsylvanicum. 

 PL 27, fig. 11. 



Mylacris pennsylvanicum Scucld., Mem. Bost. Soc. Nat. Hist., in, 44-45, pi. 5, figs. 

 13-14. 



A second specimen of this species enables me to supplant the previous description from 

 an imperfect specimen by a better ; the present specimen is also imperfect but makes up 

 in part what the other lacks. 



Fore-wing. The distal extremity is lost in each, but more of the costal is preserved in 

 the new specimen, while the inner margin is almost completely lost in both ; the form of 

 the wing can nevertheless be judged with probable accuracy ; the course of the veins 

 indicates a shorter and stouter, as it certainly is a broader wing than in M. Heeri. The 



