46 S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 



the tip of the wing but below the middle line of the same; it emits five equidistant almost 

 equal longitudinal branches, each of which forks at or somewhat beyond its middle and at 

 similar distances from the costal margin ; the mediastinal and scapular branches accordingly 

 change their direction in the most gradual way from nearly transverse to longitudinal, and 

 the mediastinal and scapular areas together occupy nearly one-half the width of the wing. 

 The externomedian vein, strongly arcuate, like the preceding, at the base, begins to divide 

 as soon as that, and beyond this is straight, terminating at a short distance before the tip of 

 the wing; its first branch passes down the middle of the wing and dies out a little beyond 

 the middle ; its three other branches, which like the first are superior, are emitted further 

 out in the apical half of the wing and are each simply forked before their middle ; the 

 upper fork of the first of these approximates very closely to the scapular vein, leaving no 

 passage for the basal branch. Beyond the base the internoinedian vein is also straight and 

 emits four equidistant branches, the first (at near the origin of the basal branches of the 

 preceding veins) being doubly, the others, excepting the apical, simply forked. The anal 

 furrow is deeply impressed, very regularly and rather gently arcuate, terminating a little 

 before the middle of the wing: the anal veins are numerous, gently sinuous and mostly 

 simple, the upper ones deeply forked and more distant. 



The species is a little above the medium size, the length of the fragment preserved 

 28. ') mm., being scarcely shorter than the real length of the wing ; its greatest breadth, at the 

 end of the basal fifth, 13.5 mm, or the breadth to the length as 1 : 2.1. The specimen is 

 very nearly perfect, and represents the upper surface of a right wing ; the anal area is 

 swollen ; the veins of the wing are prominent, and the interspaces are rather regularly 

 divided by inconspicuous straight cross-lines. 



The species is remarkable in this genus for the form of the wing, which has its tip 

 noticeably within the middle line of the wing and somewhat produced. In this it differs 

 decidedly both from Myl. bretonense and Myl. Mansfieldi. It agrees better in this point 

 with Myl. Heeri, but the crowded neuration of Myl. anthracophilum with the strong 

 deflection of the base of the veins distinguish it at once from that species. There is only 

 left Myl. pennsylvanicum with •which to compare it; ami although the apex of that species 

 is so far lost as to render it very imperfect, we may be sure from the sinuosity and apical 

 curve of the scapular vein that the apex of the wing is not within the middle line ; it is 

 further distinguished from Myl. pennsylvanicum by its tapering form and the very strong 

 basal deflection of the veins; so that this species is abundantly distinct from all the others. 

 Besides the front wing a pronotal shield has been found. At least it probably belongs 

 to this species, as the size agrees and both came from the same locality and were col- 

 lected at the same time. It is of nearly the same form as in Periplaneta americana (Linn.), 

 broadest in the middle of the posterior half where it is roundly angulate, and in advance 

 of which it tapers very rapidly to a convex front, hardly angulate laterally ; posterior 

 border broadly and strongly convex; its immediate edge narrowly and very slightly raised ; 

 the whole pronotmn is a little convex, and the surface is nearly smooth, with a few minute, 

 transverse and longitudinal lines; its greatest breadth is J 6 mm.; its anterior breadth 

 9.5 mm. ; length 12 mm. 



The specimens above described were found by Mr. A. H. Worthen. at Colchester, 



