INSECTS OF KEW BRUNSWICK. 15 



liart of the wing ; probably it is otherwise further toward the base of the wing before 

 the division of the scapular vein, for the sides of the sulcus are tolerably steep, and 

 where only a simple vein occupied the sulcus, as is ordinarily the case in neuropterous 

 wings, the sulcus would be angular. The lower externomedian branch at the middle of 

 the wing is already as far from the upper branch as that from the upper scapular branch, 

 and continues to diverge from it with a very gentle curve, which increases apically, so 

 that it strikes the border with the same direction as the veins above ; in the interspace 

 between these two branches runs a feeble intercalary vein, slightly irregular in direction 

 sending off cross veins to one side and the other, forming longitudinal irregularly pentao-o- 

 nal cells ; as the interspace widens these become more irregular, until at about two-thirds 

 the distance from the base of the wing to the tip of this branch, a superior offshoot from 

 this branch is emitted, having a course about midway between the two branches, but very 

 soon taking a somewhat zigzag direction, and assuming altogether the appearance of the 

 intercalary, to which it sends frequent cross veins ; a short distance fui'ther on, or at about 

 the end of the second third of the wing, this emits a second offshoot, rather more prominent 

 and regular than the first, which parts rapidly from the branch, and, remaining near the 

 first, afterwards takes the apical direction of all the veins ; it is bound to the upper olf- 

 shoot by frequent cross veins forming small polygonal cells ; between it and the lower 

 externomedian vein is another very feeble intercalary arising from a cross vein, and 

 becoming, like its lateral offshoots, nearly imperceptible toward the outer maro-in ; as 

 indeed do all the other cross veins and intercalaries, so that they were nearly unobserved 

 when the margin alone was exposed, and many of the cross veins fail to compass the 

 interspaces. 



What can be seen of the internomedian vein is traceable slightly further toward the base 

 of the wing than the preceding, but as the wing is broken here, it is impossible to say 

 whether it is basally divided, and the poi tion visible is the upper branch, or whether 

 what we see is the whole vein ; in the former case the upper branch, in the latter the 

 vein proper, runs sub-parallel to the lower externomedian, very slightly divero-ino- from 

 it, and in the middle of the wing (where it is broken, but where its connections leave no 

 doubt whatever of its course) is as distant from it as the two externomedian branches 

 at the same point ; a single, distinct, pretty regularly zigzag intercalary runs midway 

 between it and the lower externomedian branch, connected with tolerable reo-ularity to 

 the veins on either side by alternating, straight, transverse or oblique cross veins, generally 

 forming rather regular, longitudinal, pentagonal cells, which become exceedingly irreo-ular, 

 obscure and broken next the outer margin of the wing ; just below the apical offshoot 

 of the lower externomedian branch it throws off an inferior branch, which is nearly 

 straight, and is apically as distant from it as is the next vein above ; between these 

 branches is a very irregular intercalary vein, resembling in its connections the apical part 

 of the intercalary above. The parts of the wing below this branch are wantino-. 



The relations of this insect to living types is far more obscure than in the case of Plat- 

 ephemera. It has certain resemblances to Platephemera and 'also to the carboniferous 

 Palaeodictyoptera to which it may possibly belong, but it is certain that the limits of the 

 Ephemeridae, even including Platephemera, are not elastic enough to admit it, and its diver- 

 gence from Dictyoneura and other net-veined insects of early time is so great that its 



