PARASITICA — ICHNEUMONIDuE. 41 



Ovipositor exserted at least nearly half the length of the ahdoinon, which 

 is sessile and depressed ; or, if somewhat peduueiilate, the liead is spher- 

 ical or cul)ical as in Xorides and allied genera ; areolet triangular or 

 wanting, rarely pentangular as in Echthrus Pimplilnse. 



Subfamily IcHNEUMONiXyE. 

 Table of Genera. 



Metathoracic spiracles linear or oval 2. 



Metathoracic spiracles circular. — Pneustici 5. 



2.— Petiole of abdomen not depressed, not broader than high 3. 



Petiole of abdomen depressed, broader than high. — Platyuri 4. 



3. — Abdomen 9 acute at tip, the last ventral segment i-etracted ; % ventral 

 segments 2-4 with a longitudinal fold. — Oxypygi. 

 Scutellum more or less flat, or simply convex, and then gradually sloping 



to the apex; metathorax rarely bispinose Hcliiioiiinou Linn. 



Scutellum strongly elevated or gibbous, abruptly declivous behind ; meta- 

 thorax always bispinose Hoplisnienus Grav. 



Abdomen 9 obtuse at tip, the last ventral segment slightly or not at all re- 

 tracted ; % ventral segments 3-8 or 4-8 flat, smooth, without longitudinal 

 fold. — Amhlypygi. 



Scutellum flat, or simj)ly convex Alliblytolos Wesm. 



Scutellum strongly elevated, generally subpyraraidal Trogiis (4rav. 



4. — Scutellum cariuate laterally Platylabii»« Wesm. 



Scutellum not cariuate laterally Eiirylabus Wesm. 



5. — Scutellum scarcely or not at all elevated (5. 



Scutellum very convex and prominent - I>»(*liiiiis Grav. 



6. — Metathorax narrowed and produced posteriorly beyond the insertion of the 



posterior legs 'OroiiOf 11K Wesm. 



Metathorax not produced posteriorly 7. 



7. — Mandibles ending in a single tooth at apex '''Giiatlioryx Wesm. 



Mandibles bidentate, the teeth unequal, the lower one very short. 



IIer|>e»«toiiiti»« Wesm. 



Mandibles bidentate, the teeth equal or subequal in length 8. 



8. — Second abdominal segment without depressions above. 



Mandibles of 9 emarginate on their inferior margin ; flagellum of % fili- 

 form CoIpojxiiafliiiM Wesm. 



Mandibles not emarginate on their inferior margin. 



Postscutellum with two depressions *I>ic«elotiis Wesm. 



Postscutellum without depressions ; flagellum of % slender at base. 



teutt'teriis Wesm. 



Second abdominal segment with more or less distinct depressions at base 



above Pliirogonos Wesm. 



Our species of this group have already been noticed and tabulated 

 in a paper entitled : " Notes on the species belonging to the subfamily 

 Ichneumonides found in America nf)rth of ^Mexico (Trans. Am. Ent. 

 80c. vol. vi, July, 1877). xVt that time the material at hand belong- 

 ing to the last division (pnemtici) was so limited, that all the species 



TR.\NS. AMER. ENT. SOC. (6) SUPl'L. VOL. 1887. 



