292 PROCEEDINGS OF THE ACADEMY OF lower crossvein ; the third externomedial areolet is unusually long, its basis being on the same line with the bases of the discal and of the fourth externo-medial areolets ; the third externomedial vein, instead of issuing from the discal areolet, runs parellel to it and becomes a mere prolongation of the praebrachial vein. Other peculiarities of the neuration are, that the cubital vein forks and not the radial one (at least such is the case in both of my specimens), that the stigmatical crossvein is close at the tip of the subcostal vein, and that there is a stump of a vein near the origin of the petiole. The <^ genital organs seem to be analogous to those of Pedicia. The spurs at the tip of the tibiae of this species are very small, almost imperceptible. A. hypeeborea. Fusca, alis fusco maculatis, area pobrachiali media venula transversali instructa ; long. 0'45. Very like the preceding, but easily distinguished by the coloring of the wings, by the presence of a supplementary crossvein about the middle of the pobra-chial area, and by the oblique direction of the second lower discal crossvein (similar in this respect to all the other species of Amalopis). The only specimen which I possess is spoiled by mould, so that my descrip-tion will necessarily be incomplete. Body brownish, antennas brown, feet brownish, base of femora paler, tip of tarsi dark brown. Wings with a slight brownish yellow tinge, and with brown spots at the tips of nearly all the veins, as well as at their anastomoses. There are seven such spots along the anterior margin (one at the humeral crossvein, another a little beyond it, a third at the mediastinal crossvein, a large spot at the origin of the petiole, extending to the anterior margin, the following three at the tips of the mediastinal-subcostal and radial veins); similar, but smaller spots at the tips of the veins of the posterior margin (beginning with the first externomedinl) ; other spots at the base of the pobrachial area, in the middle of the subaxillary area (at the posterior margin), at the basis of the petiolate areolet, of the area formed by the fork of the cubital vein, and a square cloud in the middle of that area; crossveins also clouded. The petiolate areolet is present; the stigmatical crossvein is near the tip of the subcostal vein, and there is a stump of a vein near the origin of the petiole. Labrador; single <$ specimen. Contributions to the Ophiology of Lower California, Mexico and Central America. BY E. D. COPE. Caudisona durissa Law. Cope, Smithsonian Contribntions, v. xii. Researches on the venom of the Rattlesnake, by S. W. Mitchell, M. D., p. 120. A male specimen of this serpent (No. 4945) has been sent by Capt. J. M. Dow, from La Union, San Salvador, to the Smithsonian Institution (No. 4945). It is identical with specimens from Surinam in Mus. Academy, exhibiting simi-lar muzzle plates, head and neck stripes, and the isolated black dorsal rhombs upon a yellow ground, with yellow centres. The crepitacula of this species and the C. t e r r i fi c a are much shorter and more compressed than in C. a tr ox and C. h o rr i d a. Caudisona atrox sonoraensis Kenn. Proc. Acad. Nat. Sci. Phila. 1861, p. Specimens sent from Cape St. Lucas, Lower California, to the Smithsonian Inst, and Phila. Academy, by Mr. John Xantns, are more delicately tinted than Sonora specimens. The dorsal rhombs are more perfect, their yellow borders brighter, and their centres paler and similar in color to the lateral interspaces. The scales but little roughened. [Sept.