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 



