104 PROCEEDINGS OF THE ACADEMY OF DESCRIPTIONS OF MEXICAN ICHNEUMONID^. BY E. T. CRESSON. Most of the species described and enumerated in this paper were collected by Prof. F. Sumichrast in the environs of Orizaba and Cordova, and by him presented to the American Entomological Societ}", in whose collection the types are to be found. To the late Dr. Charles Sartorius the Society is also indebted for many new and interesting species collected b}^ him in the neighborhood of Mirador. The collection is exceedingly rich in species, especially of the subfamilies Ichneumonides, Cryptides, Ophionides, and Pimp-lides ; and those belonging to the genera Ichneumon and Mesos-tenus are very numerous and variable in form, structure, etc. Many of the species are handsome in ornamentation and brilliant in color. Genus ICHNEUMON, Linn. Subgenus Patroclus. This subgenus is at once distinguished from that of Ichneumon by the ungues being pectinate. The form is rather slender ; the head flat, triangular when viewed in front; the cheeks not at all prominent; the antennae long and slender, and not involute in 9, and the scutellum convex or subconvex; ovipositor scarcely or not at all exserted. Only three species are known to me, and may be separated as follows : Bodj^ entirely blue-black 1. nigrocceruletis. Body yellow, nuich marked above with black 2. lectus. Body honey-yellow, abdomen fasciate with black 3. toltecus. 1. Patroclus nigrocaeruleus, n..=p. 9. ]>hie-l)luek ; thorax deep Itluc, abdomen tinged with green-ish in certain liglits ; antennae black, with a broad, yellowisli-white annnlus ; wings violaeeus-black ; anterior tibia? yellowish in front. Thorax densely and strongly punctured ; metathorax densely rugulose, the elevated lines not well-defined; wings ample, areolet 5-angular ; legs slender; abdomen elongate, convex, finely and closely punctured ; first segment dilated at tip, which is finely
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