ICHNEUMONID^E. 21 



or setaceous, very rarely incrassate in the centre or at the apices. 

 Thorax stout ; metathorax distinctly or obsoletely areated, longi- 

 tudinal costse usually present; spiracles circular, more rarely 

 ovate. Abdomen of various outline, depressed or in the females 

 apically subcompressed ; basal segment sessile or subsessile, nearly 

 straight and rarely subarcuate ; its spiracles before, more rarely 

 in or slightly behind, the centre ; terebra always very short, more 

 rarely concealed and at most but subexserted. Legs usually 

 somewhat elongate, but in one tribe strongly incrassate ; tibial 

 calcaria sometimes wanting ; claws not unusually strongly pec- 

 tinate. Wings normal or ample ; areolet wanting, triangular or 

 rhomboidal, never pentagonal. 



Subfamily 



Head transverse or buccate ; eyes oblong, often emarginate 

 next the scrobes ; face nearly always with sericeous pilosity and 

 often prominent ; clypeus usually indistinctly discrete ; man- 

 dibles narrowed apically, with the teeth subequal. Antennae 

 filiform or setaceous, usually strongly elongate. Thorax stout, 

 more rarely subcompressed, very finely punctate and occasionally 

 glabrous, rarely rugose ; metathorax often longitudinally impressed, 

 the area? wanting or inconspicuous, areola often semicircular ; 

 spiracles circular or oblong. Abdomen strongly compressed 

 throughout, or towards the anus only ; petiolate, elongate and 

 often linear ; terebra sometimes short, often half but not often 

 fully the length of the body ; basal segment narrow and sublinear, 

 rarely abruptly dilated at the apex, its spiracles in or beyond, 

 rarely before, the centre. Legs normal or elongate, hind femora 

 rarely incrassate and dentate, their tarsi sometimes spatuliform 

 and claws rarely pectinate. Wings normal, often narrow ; areolet 

 triangular, rhomboidal, often petiolate or wanting, never pent- 

 agonal ; stigma sometimes very large and semicircular ; radial cell 

 sometimes broadly trapeziform. 



Subfamily 



Head generally transverse or tumidulous, more rarely sub- 

 globose ; eyes oblong or round, entire or nearly so ; clypeus often 

 discrete ; mandibles more rarely narrowed apically, bidentate, 

 with the teeth usually of equal length. Antenn* setaceous, often 

 very slender or incrassate throughout, sometimes pauci-articulate. 

 Thorax stout, finely punctate ; inesonotal notauli distinct; meta- 

 thorax usually completely areated, though sometimes with trans- 

 verse carinse only ; apophyses often prominent ; spiracles sub- 

 circular, more rarely ovate ; mesosternum always with distinct 

 lateral sulci. Abdomen distinctly petiolate, very rarely subsessile 

 or subcompressed ; basal segment arcuate, longer than the width of 



