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. 



