tltisterinx] BRITISH ICHNEUMONS. 17 



1. obscurella, Forst. 



Eiistcriiix obscurella, Forst. Verb. pr. Rheinl. 1871, p. 108; Schm. Opus. 

 Ichn. 2186, ? . 



This species differs from the whole remainder of the present genus, of 

 which sixteen or seventeen have been described, or more correctly indi- 

 cated, on the Continent, by having all the coxae nigrescent. 



It was originally indicated from Germany, probably about Aix, and no 

 one seems to have since recognised it, though (Jaulle in 1908 records it 

 in his French Catalogue. Bridgman includes it (Trans. Norf. Soc. 1894, 

 p. 623), with no hesitation and no remark upon its novelty as British, in 

 his Ichneumons of Norfolk, where it occurred in Way at Earlham, near 

 Norwich. 



MEGASTYLUS, Schiodte. 



Schiod. Guer. Mag. Zool. 1839, Ins. pi. vi, p. 7; Forst. Verh. pr. Rheinl. 1871, 

 p. 104. 



Head small and posteriorly constricted, with the vertex not posteriorly 

 emarginate ; frontal orbits of 9 always immaculate ; clypeus always 

 strongly and distinctly discreted, convex and laterally somewhat com- 

 pressed with strong lateral foveae ; cheeks elongate and mandibles strongly 

 acuminate, with the teeth of unequal length. Antennae elongate with 

 the scape short, subcircular and apically obliquely truncate ; pedicellus 

 large; flagellum of 9 ^\'ith verticillate pilosity and at least forty joints, of 

 (5" short with straight pilosity and the central joints not emarginate; basal 

 flagellar joint longer than second. Thorax elongate with no notauli ; 

 metathorax with a basal trans-sulcus, no discal areae and at most the 

 petiolar area short. Scutellum convex and laterally strongly compressed. 

 Abdomen petiolate, deplanate and subspatuliform ; basal segment apic- 

 ally but little explanate, with spiracles shortly before its centre, thyridii 

 of the second distinct, and terebra concealed. Legs slender and 

 elongate, with calcaria not very short. Areolet wanting, with areolar 

 nervure somewhat long and hardly shorter than it is distant from second 

 recurrent nervure; lower external angle of discoidal cell subacute; nervel- 

 lus slightly geniculate. 



1. cruentator, Schiod. 



Megasfylus cruentator, Schiod. Guer. Mag. Zool. 1839, Ins. p. 4, pi. iv, fig. 1, 

 J ; Nat. Tids. 1847, p. 97; Holmgr. Sv. Ak. Handl. lvS55, p. 128; Forst. Verh. 

 pr. Rheinl. 1871, p. 104; Brisch. Schr. Nat. Ges. Danz. 1878, p. 76; lib. cit. 

 1892, p. 38, cf ? ; Thoms. O.K. xii. 1313, cT . Hclictcs crtientatus, Hal. Ann. Nat. 

 Hist. 1839, p. 115, ? . 



Head posteriorly constricted with the mouth and clypeus rufescent, 

 and palpi whitish. Antennae basally rufescent beneath. Thorax with 

 the pleurae and sternum rufescent, and the notauli strong, extending 

 distinctly beyond mesonotal centre ; metathorax elongate, with areae 

 indistinct. Scutellum rufescent. Abdomen black, rarely with second 

 and third segments in both sexes more or less testaceous or badious ; 

 basal segment linear and slightly curved, with the second longer than 



