Known as the Early Journal Content, this set of works include research articles, news, letters, and other writings published in more than 200 of the oldest leading academic journals. The works date from the mid--seventeenth to the early twentieth centuries. We encourage people to read and share the Early Journal Content openly and to tell others that this resource exists. People may post this content online or redistribute in any way for non--commercial purposes. Read more about Early Journal

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... ntent at http://about.jstor.org/participate--jstor/individuals/early-journal--content. JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not--for--profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact support@jstor.org. NATURAL SCIENCES OF PHILADELPHIIA. 359 strong fold from orbit over tympanum. Three outer fingers slightly webbed; nearly three phalanges of the fourth toe free, the web, however, margining its outer side. Heel of the extended hind limb reaching beyond the muzzle. Breadth of gular region from angle to angle of mandible, 9 lines; length of head and bodcy 1 in. 10 lines; of anterior extremity 1 in.; of posterior 4 in. Color above grayish-brown, shaded with a pale plumbeous tint, like the bloom of some fruit. Abdomen, upper jaw, postorbital region, and the borders of the upper eyelid, tarsus and antebrachium, and of a brown spot near the vent, white. A dark brown line on the canthus rostralis, and band between the eyes; a longitudinal band or series of spots on the back, which bifurcates anteriorly; a spot on the coccyx. A dark brown band from angle of eye to scapular region, involving the whole of the tympanum. Femur with narrow cross-bands; posterior face reticulate or unicolor. Tibiae more broadly cross-banded. Sides with brownish vermiculations. Gular region brown shaded.* From Turbo. No. 4347. Additions to the Nomenclature of North American LEPIDOPTERA. No. 2. BY AUG. R. GROTE. On pages 59, 60, Proc. Acad. Nat. Sci.. 1862, I described three species of Heterocera, under the genus Platypterix, Lasp., adopting the classification of Heydenreich, in his Cat. Method. Lepidop. Europ. I have since recognized my P. formula to be identical with Drepana rosea, Walker, C. B. M. viii. and also with Cilix Americana , H. S. Lepidop. Exot. p. 60, fig. 470. This species seems, however, properly classified under neither of the above genera, and for the reasons following. The genus Cilix, Leach, was created for such Heterocera, which, closely allied to Platypterix, Lasp., are aberrant from that generic type by the straight outer margin of the anterior wings. It was established upon a European species, C. spinula, H., formerly included and described under Platypterix, Lasp., as the termination of its specific name indicates. Herrich-Schaeffer is, however, evidently in error, in placing his C. Americana under Cilix, Leach, as the outer margin of the anterior wings, unlike the type of that genus, is falcate; differing, on the other hand, from Drepana, PROCEEDINGS OF THE ACADEMY OF