Fezoniachus.'] BRITISH ICHNEUMONS. 227 



punctures diffuse but very distinct, the pubescence very short ; first segment 

 with very prominent spiracles, placed in the middle of segment. Terebra 

 more or less distinctly shorter than first segment. 



Head black, paljji dull red, mandibles black with dull red apex. An- 

 tennae brown-red, scape black-brown. Thorax blood red, the sternum 

 and tile sides above coxae black. Abdomen with first segment red, the 

 rest black, with narrow rufescent posterior margins. Legs dark red ; apex 

 of coxae and base of trochanters black ; femora almost to apex, base and 

 apex of tibiae, and the last tarsal joint brownish ; the hind legs darkest. 

 Length, 5-7 mm. 



The gently sloping metathorax and very weak ridge are said to be very 

 characteristic. 



Giraud records this species as somewhat doubtfully bred from Coleophora 

 pyrrhulipennella, Fallou. It was introduced, probably erroneously, by 

 Desvignes as British, in 1856, and has since figured in our catalogues, 

 though no specific records are obtainable. 



47. instabilis, Forst. 



Pezomachus vas^aiis, var. 4, Gr. I. E. ii. 892, ?, /*. imtahiUs, Forst Wiegm. Arch. 

 1850, p. 191;; Ratz. Ichn. d. Forst. iii. 148; RiUhe, Stetl. Zeit. 1859, p. 369, 9; 

 Thorns. O. E. x. 1015, <^ ?. Var. Bridi;. Trans. Ent. Soc. 1S83, p. 158, .5 9. 

 Heniimachtis rufocinctus, Ratz. Ichn. d. Forst. iii. 157, i (nee Grav. ). 



9 . Head with the genal sulcus shallow and narrow, and the costa only 

 normally inflexed ; clypeus elevated and rounded apically ; mandibles 

 tuberculate basally. Antennae slender, with the first flagellar joint longer 

 than the second, and the fifth longer than broad. Metanotum distinctly 

 longer than the mesonotum, which is not transverse ; petiolar area well- 

 defined, punctulate and somewhat dull, with its basal costa distinct ; 

 acetabula hardly reaching beyond centre of the mesosternum. Abdomen 

 sub-glabrous, distinctly alutaceous, with conspicuous punctures and short, 

 erect and very diffuse pubescence ; spiracles of the basal segment not 

 prominent ; terebra as long as first segment. Legs somewhat slender. 

 Wings sometimes indicated by dull red prominences on the mesopleurae. 



Head black. Antennae piceous, with the basal three or four joints red. 

 Thorax black, more or less broadly red-marked ; prothorax usually red ; 

 the costae always black. Abdomen black ; usually with the apex of the 

 first segment, often part of second and very rarely the apices of the 

 remainder narrowly, red. Legs red, with the apices of the intermediate 

 tibiae, the hind femora and tibiae, more or less infuscate. Length, 

 2^-5 mm. 



i . Clypeus small and not discreted ; mandibles basally tuberculate. 

 Antennae attenuate towards the apex. Metatliorax dull, with the areola 

 distinct and elongate-pentagonal, apically entire ; petiolar area short. 

 Scutellum indicated. Abdomen somewhat dull and finely aciculate with 

 short and diffuse pubescence ; ba.sal segment narrow, with the post-[)etiole 

 (juadrate and spiracles not prominent. Wings with the stigma not broad, 

 emitting the radial nervure beyond its centre ; areolet strongly elongate 

 with the outer nervure wantitig ; discoidal cell apically acute and ncrvrllus 

 antefurcal. 



Q 2 



