172 BRITISH ICHNEUMONS. [Slt'lbops. 



STILBOPS, Forster. 

 Forst. Verb. pr. Rheinl. 1868, p. 163 ; Thorns. O. E. xiii. 1427. 



Head somewhat pointed, tapering from the broad eyes, through the 

 constricted cheeks, to the narrow and prominent mandibles and exserted 

 ligula ; face with dense and elongate silvery pubescence, a little elevated 

 longitudinally in the centre and not laterally emarginate ; clypeus not cen- 

 trally discreted but with an oblique fovea on either side, apically rounded, 

 glabrous, somewhat reflexed but obsoletely margined, teeth of equal length 

 with the lower more acuminate; frons subconvex, distinctly impressed 

 transversely throughout above the antennae and not longitudinally cana- 

 liculate in the centre ; vertex narrow and angularly emarginate in 

 the centre. Antennae of 9 slightly incrassate towards their apices 

 with the apical joint obtuse and nearly as long as the three follow- 

 ing together, of S filiform with the apical joint not longer than the 

 penultimate. Thoracic epomiae reaching shoulders, notauli wanting, 

 frenum dentately produced above the posterior radices ; metanotum not 

 short, gradually declived throughout, with the areae distinct and spiracles 

 circular. Abdomen finely and closely punctate and pilose, convex and 

 subcylindrical, with no trace of tubercles nor impressions, though with the 

 three basal segments apically subelevated ; basal segment nearly half as 

 long again as the second, convex and not impressed, with no carinae and 

 only basally subexcavate, narrowly margined at the sides and broadly 

 sessile, with the spiracles before the centre ; terebra shorter than basal 

 segment, stout, obsoletely pilose, deflexed and apically obtuse. Legs 

 slender; tarsal claws minute, not pectinate, curved and not basally lobate; 

 first joint of front tarsi strongly emarginate basally, with calcaria curved ; 

 onyches not explanate. Stigma broad, subtriangular ; areolet entire, ses- 

 sile, irregularly oblique ; nervellus opposite and intercepting only slightly 

 above the posterior nervure. 



Thomson, who gave the first at all detailed account of this genus, points 

 out that the hypopygium is not retracted as in Pimphi, but takes the same 

 form as mLissonola and Glypta, as also do the onychii, which are not stout 

 and explanate, as in Pimpla. From all the allied genera, Sfi/bops differs 

 in the shortly subrostrate mouth, the close and silvery facial pubescence, 

 distinctly and completely costate metathorax, large stigma and oblique 

 nervellus, and in the uniformly punctate abdomen, bearing no tubercles 

 nor impressed lines. 



It is usually placed in the Lissotio/ini, but Schmiedeknecht regards it as 

 little more than a subgenus of Pimpla ; indeed, it unites many features of 

 both sections and forms a more or less natural connectijig link. Graven- 

 horst described our single species under three distinct genera. 



