242 [April the basis, and infuscated at the tip : tibire brownish, darker at the tip ; tarsi brown. Wings with a brownish-cinereous tinge, stigma pale brownish, small, oblong: second longitudinal vein arcuated at the basis; its inner section not much shorter than the third vein, with which it forms a straight line : its outer section forms a 'knee or a right angle at its basis, usually with a stump of a vein, projecting from this angle; submarginal and first posterior cells precisely of the same length; second posterior cell attenuated at its basis; discal cell elongated, square: great cross-vein inserted before the middle of the discal cell: fifth longitudinal vein inflected at the 'tip. Although the first longitudi-nal vein, in this species, as in all the Cylindrotomoeformia is incurved towards the second, it has, at some distance lief ire the tip, a rather indistinct, slen-der, oblique cross-vein, connecting it with the costa. Hub. — White Mountains, N. H., (nob?)', two male specimens. Catalogue of HYMENOPTERA iu the Collection of the Entomological Society of Philadelphia, from Colorado Territory. BY E. T. CRESSON. (Communicated March loth, 1865.) The greater part of the collection composing the papers which I propose to publish under the above title, was collected in the mountain region of Colorado Territory, in the summer of 1864, by Mr. James Ridings, and most generously presented to the Entomological Society by Dr. Thomas B. Wilson. The species are numerous, and most of the families are well repre-sented ; many of the species, especially those belonging to the Eume-nidre and Apid;xi, are beautifully adorned, and almost too brilliant in their colors to be inhabitants of a climate so temperate as that of the mountain region of Colorado Territory. Fam TENTHREDINID.E. Genus CIMBEX, Fabr. Cimbex americana, Leach. Cimbex americana, Leach, Zool. Miscel. iii, p. 104. Norton, Proc. Ent. Soc. Philad. i, p. 201 (with full synonymy). One % specimen with hyaline wings. Genus TRICHIOSOMA, Leach. Trichiosoma triangulum. Kirby. Trichiosoma triangulum, Kirby. Fauna Bor.-Am. iv, p. 254. Norton, Proc. Ent. Soc. Philad. iii, p. 5. Two specimens. Genus SCHIZOCERUS. Latr. 1. Schizocerus plumiger. King. Hylotoma plumigera, Klug. Berlin Magazin, 1814, p. 306. Cryptus Klugii, Leach, Zool. Miscel. iii, p. 125.
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