30 BRITISH ICHNEUMONS. {^Porizon 



1. exhaustator, Fah. 



Ichiiciimon exiiausfator, Fab. Ent. Syst. Suppl. 1798, 226. Ophion exhausta- 

 tor, Fab. Piez. 135; Panz. F.G. ix. 107, T. 8; Gr. I.E. iii. 1044. Porizon hostilis, 

 Or. lib. cit. 753, <? ? {ncc Holmgr.). P. cxhaustor, Zett. I.E. i. 396; Holmgr. 

 Sv. Ak. Handl. 1858, p. 133, ? ; Thorns. O.E. xiii. 1361, <? ? . 



Head densely punctate and piceous-pubescent, hardly constricted pos- 

 teriorly, with the vertex broad ; cheeks elongate and buccate ; clypeus 

 basally discreted, apically rufescent, depressed and broadly rounded ; 

 mandibles centrally rufescent with teeth of equal length. Antennae 

 hardly extending beyond thoracic apex, with flagellum in both sexes 

 apically attenuate. Thorax stout; mesonotum densely punctate with the 

 pleurae somewhat smooth, diffusely punctate and the speculum distinct ; 

 metathorax punctate, more densely towards its apex with distinct carinae 

 from apex as far as its centre. Abdomen fusiform and red with the first 

 segment entirely and second basally black; petiole discally deplanate, 

 postpetiole distinctly explanate, little convex, longer than apically broad 

 and double breadth of petiole ; second segment longer than apically 

 broad, and the distinctly reflexed terebra half length of abdomen. Legs 

 stout and red with coxae and base of trochanters black ; femora subex- 

 planate and hind tibiae longer than metatarsi. Wings infumate piceous 

 with the somewhat narrow stigma and the tegulae infuscate ; radial ner- 

 vure emitted from centre of stigma and apically but slightly curved. 

 Length, 10-12 mm. 



It is said to extend throughout north and central Europe, though to be 

 nowhere common. Gravenhorst took the male in a German pine wood 

 towards the end of September; Zetterstedt found a female in Lapland, 

 Thomson records it from Sweden, and it is known from both France and 

 during September in Belgium, though nowhere yet bred. I should have 

 omitted this rare species from our Fauna, as probably mixed with P. hos- 

 tilis, Holmgr. {iiec Grav.), were it not that I captured a female crawling 

 sleepily in a lane at Wherstead, near Ipswich, so late in the year as 

 October 28th, in 1898. 



2. dissimilis, Grav. 



Porizon dissimilis, Gr. I.E. iii. 774 (excl. ? ); Zett. I.E. i. 396, 3 . P. agilis, 

 Holmgr. Sv. Ak. Handl. 1858, p. 134, ? . P. (Cyrtophion) dissimilis. Thorns. 

 O.E. xiii. 1367, ? . Thersilochus dissimilis. Holmgr. Sv. Ak. Handl. 1858, 

 p. 141, c?. 



Head smooth and shining, slightly constricted posteriorly, with the 

 mandibles rufescent and palpi flavidous. Antennae filiform and a little 

 longer than half body, with their base rufescent beneath and the first 

 joint of the $ ig-jointed flagellum little longer than the second. Thorax 

 somewhat elongate, with no mesonotal notauli; metathorax not rugosely 

 punctate but with the petiolar area extending beyond its centre. Abdo- 

 men laterally rufescent beneath with apices of the segments usually 

 concolorous; petiole slightly curved; postpetiole shorter than twice and 

 a half the petiolar breadth ; terebra strongly reflexed and about length of 



