112 BRITISH ICHNEUMONS. 



A large black species with white markings. Head black, buccate, not 

 narrowed behind the eyes ; temples broad ; cheeks and mandibles closely 

 j)unctate, the former tumidous ; clypeus sub-bisinuate and depressed in 

 front ; mandibles red before their apices ; c? face and clypeus laterally 

 white. Antennae setaceous in S, hardly attenuate in $, black; white- 

 banded ; 6 with scape white-marked beneath. Thorax black, callosity 

 beneath radix white ; 6 pronotum and line before radix also white ; areola 

 somewhat longer than broad, sub-rectangular. Scutellum white, base 

 narrowly black. Abdomen elongate, entirely black ; post-petiok finely 

 centrally aciculate ; second segment basally finely punctate, gastrocaeli 

 narrower than intervening space. Legs black ; ? with front tibiae and 

 tarsi piceous ; S with all the tibiae centrally white, front ones laterally 

 pale stramineous at the apex. Wings fumato-hyaline ; stigma fulvo- 

 testaceous ; tegulae black, in S with a white dot. Length, 18-20 mm. 



The (?, described by Gravenhorst (Ich. fuscipes, var. 2), had the an- 

 tennae entirely black. 



Having been transferred in the first instance with some little hesitation 

 to his genus Chasmodes by Wesmael, this species was again included in 

 Ichneumon by Thomson on account of the much lesser degree to which 

 the apex of the clypeus is emarginate than in C. viotatorius a.nd paludicoia, 

 and this position appears more natural, though Berth, again placed it in 

 Chasmodes in 1894. From all others of the present genus it may, however, 

 be at once distinguished by the more or less sinuousness of the clypeus 

 laterally, as well as by its dilated temples, entirely black abdomen, and 

 deep, narrowly divided gastrocaeli and thyridii. 



I. lugens would appear to be somewhat rare in Britain and I do not 

 think it has ever been bred. The females are said to pass the winter in 

 the perfect state. Stephens found it rarely near London, in June, there 

 are specimens in Bridgman's and Chitty's collections and Bignell has 

 taken it at Ivybridge, near Plymouth, also in June. The original $ {Ich. 

 fuscipes y var.) was sent to Gravenhorst by Hope, who captured it in the 

 vicinity of Netley. 



2. deliratorius, Linn. 



Ichneumon deliratorius, Linn. F. S. 1761, i ; Wesm. Nouv. M(5m. Ac. Brux. 1844, 

 p. 37 ; Thorns. O. E. xviii. 1914 ; Berth. Ann. Soc. Fr. 1894, p. 167, J ? . /. muiti- 

 annulatus, Gr. I. E. i. 223, i ; Ste. 111. M. vii. 151 ; Holmgr. Ichn. Suec. i. 49, tJ 9. 

 /. molitorius, Linn. F. S. ; Gr. I. E. i. 258 (part) ?. Cf. Kriechb. Ent. Nachr. 1892. 



At once known by its caerulescent body from all the other species of the 

 genus. Cheeks and temples normal, diffusely punctate ; clypeus truncate, 

 nearly glabrous ; ? usually with angles of clypeus and frontal orbits red, 

 $ palpi, clypeus and face entirely pale fiavous. Antennae distinctly 

 attenuate, of ? white-banded, of $ black with the scape longitudinally 

 white beneath ; first joint of flagellum twice longer than broad, fifth 

 quadrate. Thorax black, c^ with callosities at radix white ; mesopleurae 

 centrally sub-aciculate transversely below ; notauli evident anteriorly ; 

 metanotum rugosely punctate with complete upper areae ; areola rect- 

 angular, slightly longer than broad in $, semi-lunar in t{, its apex angu- 

 lated. Scutellum white. Abdomen blue-black, lanceolate-oval ; seventh 

 segment white-marked in ? ; $ often has incisures of second and third 

 segments reddish ; post-petiole aciculate or striate, punctate laterally ; 



