290 ICHNEUMONID^E. 



About half the Palaearctic genera are now recorded from India, 

 including two erroneously supposed to be new by Cameron, who 

 has further erected two which appear to me to be valid (though 

 one of them I have not seen), and these, together with one herein 

 brought forward, give us a total of eight from the Oriental Eegion. 

 This comparatively large number may perhaps be accounted for by 

 the fact that these insects attack, so far as we know at present, 

 Le idoptera and pot TENTHEEBINID.E. 



Table of Genera. 



1 (16) Flagellum filiform, its basal joint 



elongate. 



2 (13) Antennae distinctly shorter than 



body ; flagellar joints cylindrical. 



3 (6) Scutellum laterally margined ; rneta- 



thoracic spiracles sublinear. 



4 (5) Metanotum not areated; head pos- 



teriorly broad AITHIUS, Cam., p. 290. 



5 (4) Metanotum fully areated ; head [p. 292. 



posteriorly very narrow XANTHEXOCHUS, gen. n., 



6 (2) Scutellum without a lateral margin ; 



metathoracic spiracles oval or cir- 

 cular. 



7 (10) Areolet wanting. 



8 (9) Basal metathoracic area not dis- 



crete from areola EXOCHUS, Grav., p. 293. 



9 (8) Basal area discrete from areola POLYCLISTUS, Forst., 



10 (7) Areolet present. [p. 298. 



11 (12) Basal segment of abdomen elongate 



and discally bicarinate TRICLISTUS, Forst., p. 300. 



12 (11) Basal segment quadrate and discally [p. 304. 



smooth MEGATREMA, Cam., 



13 (3) Antennae as long as body, or nagellar 



joints denticulate. 



14 (15) Metanotum subglabrous, with all [p. 305. 



arese obsolete COLPOTROCHIA, Holmg., 



15 (14) Metanotum rugulose, with complete [p. 308. 



arese HYPERAOMTJS, Holmg., 



16 (1) Flagellum setiform, its basal joint [p. 310. 



transverse SETICORNUTA, gen. n., 



Genus AITHRIS, Cam. 

 Aithris, Cameron, Manch. Mem. 1900, p. 106. 

 GENOTYPE, A. cornutus, Cam. 



Head buccate and broad behind the large, emarginate and not 

 apically convergent eyes; cheeks short, labrum not exserted, 

 clypeus not discrete, mandibles stoutly bidentate; occiput im- 

 marginate, frons apically prominent; vertex denply impressed 

 centrally, ocelli large. Flagellum with the two basal joints of 

 equal length. Mesopleurao centrally prominent and basally 



