British BraconidcB. 191 



are well distinguished by nature ; it remains only to 

 eliminate their names from the confusion of synonymy, 

 which is best effected by adopting the two genera 

 Macrocentrus and Zele. The former involves no difficulty, 

 but Zele, Curt., could not be accepted without its further 

 interpretation by Haliday. Two more genera have been 

 proposed by Forster, Homolohus, a dismemberment of 

 Zele, and Amicroplus, a dismemberment of Macrocentrus, 

 but they are founded upon extremely trivial distinctions. 



Occiput not margined; middle lobe of the meso- 



notum gibbous ; abdomen linear above, 1st seg- 

 ment not or hardly longer than the 2d ; terebra 



straight, at least as long as the abdomen, usually 



much longer . . . . . . . . . . i. Macrocentrus. 



Occiput margined ; middle lobe of the mesonotum 



not more elevated than the 2 lateral ; abdomen 



subclavate above, 1st segment much the longest ; 



terebra falcate, much shorter than the abdomen ii. Zele. 



i. Macrocentrus, Curt. 



Curt., Ent. Mag., i., 187 (1833) ; Hal., lib. cit., iii., 

 186. 



Rogas, Wesm., Nouv. Mem. Ac. Brux., 1835, p. 170. 



Head three times as broad as long ; vertex narrow, elevated into 

 a transverse ridge. Radial nervure of the hind wings not 

 sinuated ; radial areolet never geminated by a transverse nervure. 

 Spurs of hind tibiae not half as long as the metatarsus. Second 

 abdominal segment canaliculated along the lateral margins. 



Head as broad as the thorax, very oblate ; occiput emarginate 

 above ; vertex transversely compressed, with a raised stemmaticum 

 on its hinder edge ; front abruptly descending ; face broad, flat- 

 tened ; clypeus discrete, transverse, with a fovea on each side of 

 the base ; mandibles acutely bidentate. Antennae slender, seta- 

 ceous, usually longer than the body, with 30 — 54 joints. Thorax 

 oblong, somewhat compressed ; mesothoracic lobes gibbous, espe- 

 cially the middle one ; metathorax short, subtruncate. Stigma 

 ovate, protuberant outside the costa ; radial areolet lanceolate, 

 ending not far from the apex of the wing ; 1st cubital areolet 

 receiving the recui'rent nervure beyond the middle ; 2d small, 

 oblong, its hinder basal angle produced ; radius of the hind wings 

 with a short petiole ; pobrachial areolet longer than half the prae- 

 brachial. Legs elongate ; 2d joint of trochanters sometimes 

 ending in a minute spine on the outer side. Abdomen longer and 

 narrower than the thorax, linear, deplanate, compressed at the 



