462 SAMUEL H. SCUDDER ON THE 



ate curve embracing the discal stigma next it and terminates about as for out as the 

 scapular vein; its branches are almost always simple, g'ently arcuate, and more distant 

 than in other parts of the wing, except those that ai'ise nearest the somewhat sudden 

 and considerable turn in direction, where they are generally deeply forked. The anal 

 furrow is not pronounced, almost bent rather than arcuate, and terminates hardly be- 

 yond the basal third of the wing. 



The whole wing is of a dark color, excepting for the two stigmas which are light or 

 diaphanous and for occasional light streaks in the broader spaces, particularly in the 

 neio-hborhood of the stigmas and on the costal side; besides, the whole wing, as also the 

 hind wing, is covered with a delicate scarcely perceptible mesh of fine lines. 



The outer half or less of the hind wings is ]:)reserved in several instances, showing 

 that this wing was of about the same length as the fore wing but of a different shape, 

 having a straighter costa, a fuller hind margin, and a more pointed apex, which was far 

 above the middle line of the wing. The mediastinal area (fig. 4) was very narrow, and 

 subequal, terminating somewhat abruptly when it had extended over nearly five-sixths 

 of the wing, and had numerous very oblique branches. The scapular does not branch 

 before the distal third of the wing, and then reaches with a few longitudinal and mostly 

 simple veins to the tip. The externomedian area is narrowly fan-shaped, the first divar- 

 ication occurring near the middle of the wing and most of the forking of the longitudinal 

 branches near the middle of the apical half. The internomedian vein reaches a little 

 further out than the scapular, but the main vein is nearly straight, and the branches 

 mostly simple, and only gently arcuate and parallel, so as to be very different from the 

 fore wing. 



The pronotal shield can be seen and then but obscurely only in a single instance. It 

 appears to be rather small and transversely obovate. 



Length of fore wing, 17.5 mm.; breadth, 5.5 mm. 



Eleven more or less perfect specimens were found by our party, the first and best 

 specimen (fig. 6) by my son. I have accordingly named the species for him. 



2. Spiloblattina triassica. 

 PI. 41, flg. 1. 



SpiloUattina triassica Scudd., Proc. Acad. Nat. Sc. Philad., 1885, 36. 



Two incomplete fore wings arc preserved showing that the species is nearly allied to 

 the last; the veins are more delicate, however, and have other differences which will be 

 pointed out. Although only the costal margin is in any degree preserved, and tliis is 

 straighter than in 8. gardineri, the form of the wing appears to be essentially the same 

 and with the same proportions. The mediastinal vein and its branches are precisely as 

 in 8. gardineri. The scapular vein is also very similar, and its branches similarly ar- 

 ranged and forked, but they are a little more longitudinal and arise earlier, the first some 

 way before the middle of the Aving; the main vein is also exceptionally straight, showing, 

 as it passes the stigma between it and the externomedian vein, no disposition to curve 

 toward the latter. The externomedian vein is practically a repetition of the same vein 

 in ;S'. gardineri. The internomedian passes at rather a less distance from the preceding 



