. Anniversary memoirs of the Boston Society of Natural History. Natural history; Indians of North America. 92 S. H. SCUDDER ON PALAEOZOIC COCKROACHES. Anthracoblattina dresdensis. (See figure in text.) Blattina dresdensis ;, Sitzungsb. naturw. Gesellsch. Isis^, 1879, 12-13, figs. The fore wing is elliptical and very regularly formed, broadest in the middle; the costal margin is pretty strongly convex, especially on the basal half; the inner margin much straighter, and the tip well rounded. The veins originate a little above the middle of the wing, and curve gently upward before as
. Anniversary memoirs of the Boston Society of Natural History. Natural history; Indians of North America. 92 S. H. SCUDDER ON PALAEOZOIC COCKROACHES. Anthracoblattina dresdensis. (See figure in text.) Blattina dresdensis ;, Sitzungsb. naturw. Gesellsch. Isis^, 1879, 12-13, figs. The fore wing is elliptical and very regularly formed, broadest in the middle; the costal margin is pretty strongly convex, especially on the basal half; the inner margin much straighter, and the tip well rounded. The veins originate a little above the middle of the wing, and curve gently upward before assuming a longitudinal course. The mediastinal vein, beyond the basal fifth of the wing, is nearly straight, scarcely curving upward with a broad sweep apically, and terminating only a little before the apex of the wing; it emits eight or nine rather closely crowded, nearly straight, oblique branches, about half of which are simple, the others simply or doubly forked at or beyond the middle; the area is broadest a little before the middle of the wing, where it is one-third the width of the wing. The scapular vein runs parallel and close to the mediastinal until it forks, a little beyond the end of the basal third of the wing, and then turns downward in a nearly straight course subparallel to the costal margin, to just below the tip of the wing; it emits three equidistant longitudinal branches, the first two of which fork near the origin of the simple third, and embrace between them the upper tip of the wing. The externomedian vein, beyond its curved base, runs in an almost perfectly straight line to just below the ex- treme tip of the wing, and, commencing to branch just before the middle of the wing, or scarcely beyond the division of the scapular vein, it emits four simple, inequidistant, arcuate branches, which (especially the basal jDair) are at first oblique and then longitudinal. The internomedian vein is broadly sinuous in its course, being at first convex in the same sen
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