INSECTA. 381 



t Genuine Ichneumons, with abdomen convex, or depressed, 

 a) With abdomen petlolate or sub-petiolate. 



Ichneumon L. (exclusive of man y species). Head narrower than 

 lorax. Borer subexsert or concealed. Second cubital cell dis- 

 tinct, mostly pentagonal. 



Sp. Ichneumon sputator FABK., PANZER, Deutschl, Ins. Heft ig, Tab. 20; 

 Ichn. Troscheli RATZEB., in the caterpillar of Noctua piniperda. 



Tryphon FALL. 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 n. pp. i 368. 



Add sub-genus Polyblastus HARTIG, 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 FABR., DE GEER, n. PI. 29, fig. 9, 

 p. 848 ; one of the largest native hymenoptera, 10 lines to i 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 Sphinx ocellata, Sph. pinastri, &c. 



Alomya PANZER, GRAVENH. ' 



Cryptus FABR. 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 

 8 1, Tab. 13, &c. 



Add genus Cylloceria SCHIODTE, see GUERIN, Magas. de Zool. 1839, 

 Ins. PL 9, 10. 



Xorides LATE. 

 Accenitus LATR. 



1* /3) With abdomen sessile (eodremely short petiole). 



Pimpla FABR. Head transverse. Borer exsert, long. Antennas 

 long, filiform, slender, with numerous joints. Mandibles bifid at 

 apex. 



