INSECTS OF NEW" BRUNSWICK. 7 



is perfect and indicate an insect whose alar expanse was nearly 45 mm., and which is most 

 nearly related to Hexagenia ; the first inferior nervule of the upper fork of the upper 

 branch of the extermomedian vein is thrown off some way before the middle of the wino- • 

 the lower branch forks at some distance beyond the middle of its course, and encloses 

 between its branches a single intercalary nervule which extends nearly to the widely 

 spreading fork. At a short distance from the base of the wing the lower branch of the 

 externomedian vein has divided into three branches, the middle one nearer the upper than 

 the lower, all of which continue undivided to the margin ; two intercalary nervures of 

 unequal length occur in each of these interspaces, extending almost half way to the base 

 in the lower interspace, besides many short ones near the margin; the lowest of these 

 branches is considerably curved and subparallel to the inner margin. The internomedian 

 vein probably divides at the very base into two branches, the upper of which is simple, 

 runs subparallel to the lowest externomedian nervule, striking the angle of the wino- 

 while the other branch is in close proximity to it and throws off a large number of sin- 

 uous simple branches to the anal margin, in doing which its outer half follows an irreo-- 

 ular course by a slight change of direction with each emission. The cros,s-veins are mod- 

 erately frequent and subuniform throughout the portion of the wing which is preserved 

 excepting in the internomedian area, and the border is much bi-okeu by intercalary nerv- 

 ules into cells which are quadrate and generally much longer than broad. The anal 

 area must be very contracted and the form of the wing closely resembles that of Hexa- 

 genia. 



The specimen is from Solenhofen, and is in the British Museum. The description is 

 drawn up from a very clear sketch magnified 7 diameters, taken with the camera and pub- 

 lished by Rev. Mr. Eaton in the Transactions of the Entomological Society of London 

 1871. PI. 1, fig. 10. The species is dedicated to my friend Dr. Weyenbergh, of Cordoba, 

 who has done so much in increasing our knowledge of the Jurassic insect fauna of Bavaria. 



III. PLA.TEPHEMERA. ANTIQUA. PI. 1, figs. 5, 9, 10. , 



Platephemera antiqua Scudd., Can. nat., (n. s.) iii, 205, fig. 2 (1867); — Ib., Geol. mat--. 

 IV, 387, pi. 17, fig. 2 (1867) ;—Ib., Dawson, Acad. Geol., 2d ed., 524, fig. 181(1868); — 

 Ib., Amer. nat., i, 630, pi. 16, fig. 3 (1868); — Ib., Geol. mag., r, 173, 175-76 (1868); — 

 Pack., Guide ins., 77-78, pi. 1, fig. 3 (1869); — Nichols., Man. pal., 185, fio-. 128 

 (1872) ; — Ib., Anc. life hist, earth, 145, fig. 89 (1877) ; — Dana, Man. geol., 2d ed., 273, 

 fig. 550 A (1874) ; — RoEM., Leth. geogn., pi. 31, fig. 9 (1876). 



Mentioned without name, as the first species, in my letter to Mr. Hartt on the Devonian 

 Insects of New Brunswick (1865); — Bailey, Obs. geol. south. New Brunsw. 140 



(1865); — Amer. journ. sc, (2) sxxix, 357(1865); — Can. nat., (n. s.) ii, 23 (1865); 



Trans, entom. soc. Lond., (3) ii, 117 (1865). See also Amer. journ. sc, (2) xl, 277 

 (1865). 



The wing was ample (whence the generic name) and gigantic. Probably a third of 

 the wing is wanting at the base, besides the greater part of the extreme outer edge, but 

 the fragment preserved enables us to judge, probably with considerable accuracy, both 

 the general structure and, by the direction of the nervules and of the margins, the general 



