Promic/i/s.] BRITISH ICHNEUMONS. 253 



ted and the very stout hind ]egs; it agrees with Syzfuctiis in the elongate 

 and large metathoracic spiracles, and in general fades distinctly resem- 

 bles Acni'iii/us, between which and the fj'ssoiiotidcs it may be considered to 

 form a connecting link. It is i)laced in the Aaieiiilinihy Ashmead. 



It is to be supposed that we possess in Britain the only (^ravenhorstian, 

 of the nine palaearctic, species of this genus. 



1. decimator, Grav. 



Lissonota decimator, Gr. I.E. iii. 96; Schaff. F.G. cxvii. 13, ? ; Tasch. Zeits. 

 Ges. Nat. 1863, p. 284, s ? . Heterolabis crasstila, Kriech. Ent. Nachr. 1889, 

 p. 18 ; Prociiietits crassula, Schra. Zool. Jahr. 1900, p. 326; P. decimator, Schm. 

 Opusc. Ichn. 1233, cf S . Cf. Thorns. O.E. viii. 762. 



A large, short and stout species with incrassate legs ; somewhat shin- 

 ing, punctate and black. Head hardly narrowed behind the eyes ; frons 

 and face coarsely and strongly punctate with the latter not centrally ele- 

 vated ; clypeus ferrugineous with the foveae obsolete ; internal and gener- 

 ally the external orbits more or less distinctly castaneous or in ^ flavous, 

 though in 9 sometimes immaculate. Antennae filiform, mainly ferru- 

 gineous ; of ^ hardly shorter than the body with the scape flavous, and 

 flagellum ferrugineous, beneath; of 9 rather shorter than the body, 

 either black and ferrugineous beneath towards their apices, or ferrugine- 

 ous with the three basal joints black. Thorax gibbulous and immaculate; 

 metalhorax with petiolar area entirely wanting and the spiracles elongate. 

 Scutellum black. Abdomen deplanate, punctate, oblong, a little longer 

 and in ^ narrower than the head and thorax, becoming smoother and 

 more shining apically ; basal segment discally impressed, longer than the 

 hind coxae, not elevated, strongly punctate with the apical margin cen- 

 trally smooth, in J basally constricted with prominent spiracles ; follow- 

 ing segments transverse in both sexes, of 9 pale castaneous with the base 

 of the first segment and anus black, and the fifth to seventh membrana- 

 ceously white-margined, of J with the four basal segments red, more or 

 less broadly black-marked or mainly black ; terebra somewhat longer, 

 sometimes twice longer, than the body, black with spicula casteneous. 

 Legs red and stout, with the hind ones longer and stouter ; coxae and 

 trochanters, anterior femora usually basally and the hind ones at the apex 

 and in 9 sometimes also at the base, hind tarsi and tibiae externally, 

 infuscate or black. Wings normal and, especially in 9 > somewhat cloud- 

 ed ; stigma and radius piceous; radix stramineous, tegulae black or infus- 

 cate ; nervelet elongate ; areolct emitting recurrent nervure nearly from 

 its centre, of J triangular, peLiolatc or sessile, very rarely pentagonal or 

 obsolete, of 9 small, irregular or subrliomboitlal, more or less petiolate 

 and sometimes obsolete ; nervellus intercepting far above the centre. 

 Length, 7 — 11 mm, 



