INSECTA. 381 
+ Genuine Ichneumons, with abdomen convex or depressed. 
a) With abdomen petiolate or sub-petiolate. 
Ichneumon L. (exclusive of many species). Head narrower than 
thorax. Borer subexsert or concealed. Second cubital cell dis- 
tinct, mostly pentagonal. 
Sp. Ichneumon sputator Fapr., Panzer, Deutschl. Ins. Heft 19, Tab. 20; 
—Ichn. Troscheli RavzeB., in the caterpillar of Noctua piniperda. 
Tryphon Fatt. Head narrower than thorax. Borer subexsert 
or concealed. Second cubital cell almost obsolete, triangular. 
Abdomen elongate. 
On this genus, which contains very numerous species, comp. GRAVEN- 
HORST, Ichneumol. 11. pp. 1—368. 
Add sub-genus Polyblastus Hartic, SCHIODTE. 
Megastelus SCHIODTE. 
Trogus PANZER, GRAVENH. Head transverse. Borer concealed. 
Second cubital cell triangular or quinquangular. Scutellum gib- 
bous, prominent. Abdomen distinctly petiolate, oblong. 
Trogus lutorius, Ichneum. lutorius Fasr., DE GEER, It. Pl. 29, fig. 9, 
p- 848; one of the largest native hymenoptera, ro lines to 1 inch long ; 
thorax black, scutellum sulphur-yellow, feet and head yellow beneath, 
abomen red-brown, at the extremity blackish. The larva lives in the cater- 
pillar of Sphina ocellata, Sph. pinastri, &c. 
Alomya PANZER, GRAVENH. 
Cryptus Fapr. Head transverse. Abdomen oval, distinctly 
petiolate. Borer exsert. 
Note.—Some species are distinguished by their small size, the defect of 
wings, or by rudiments alone of wings: sub-genus Pezomachus GRAVENH., 
Sp. Crypt. nigro-cinctus, Ichn. pedicularius Panzer, Deutschl. Ins. Heft 
81, Tab. 13, &. 
Add genus Cylloceria ScH16DTE, see GuERIN, Magas. de Zool. 1839, 
Ties Phin Fe 10: 
Xorides LATR. 
Acenitus LATR. 
+ B) With abdomen sessile (extremely short petiole). 
Pimpla Farr. Head transverse. Borer exsert, long. Antenne 
long, filiform, slender, with numerous joints. Mandibles bifid at 
apex. 
