BRITISH ICHNEUMONS. 137 



phaena pronuba and other Noduidne ; it is very probable, however, that 

 he confused several species under the present one. 



26. gracilentus, Wesm. 



Ichveuviou gracilentus, Wesm. Nouv. Mem. Ac. Brux. 1844, p. 55 ; Bui. Ac. Brux. 

 1848, p. 23 ; lIolm<^r. Sv. Ak. Handl. 1854, p. 31 ; Ichn. Suec. i. 64 ; Thoms. O. E. 

 xviii. 1924 ; Ann. Soc. Fr. 1886, p. 21 ; Berth, lib. cit. 1894, p. 651, (5 9 . I- ascendcus, 

 Tisch. Stett. Zeit. 188 1, i . Varr. /. iniprohits et ]. qitadyiliiicatus, Tisch. ///'. cit. 188 1, 

 i i. Var. /. viciinis, Holmgr. Ichn. Suec. i. 67, S ?. 



Ratlier smaller and narrower than the last -described species. Head 

 sub- triangular, black; cheeks of $ slightly dilated and smooth beneath; 

 mouth in part and frontal orbits red or flavidous ; of S with the broadly 

 rounded clypeus, the palpi, mandibles in part, whole face except rarely a 

 central mark, and the frontal orbits, pale flavous. Antennae black ; of ? 

 filiform, white-banded, with fifth joint quadrate ; S scape flavous, and 

 flagellum fulvous or rufescent, beneath. Thorax slightly narrower than 

 head, black, pronotum of ? often rufescent, $ with usual flavous lines 

 near radix ; metathorax with three upper areae of which the areola is 

 sub-quadrate in S, rectangular and twice longer than broad in $, and 

 in both sexes slightly emarginate apically. Scutellum elongate, whitish 

 flavous, punctulate, with the apex strigose ; S strongly convex, with post- 

 scutellum also often flavous. Abdomen black ; of ? elongate-oval with 

 segments two and three red, six and seven bearing oblong white marks ; 

 of S sub-linear, with segments two and three, and sometimes also base of 

 fourth flavous, third quadrate ; post-petiole aciculate, elevated between the 

 spiracles, gastrocaeli normal with intervening space somewhat narrower 

 than centre of post-petiole ; legs black ; $ tibiae and tarsi red, the hind 

 ones apically black ; hind femora normal with the inner side strongly 

 punctate, coxae without scopulae ; legs of $ with tibiae and tarsi flavous, 

 the hind ones apically infuscate. Wings sub-hyaline, somewhat fulvescent 

 with tegulae flavous-marked in S ; stigma pale fulvous, tegulae reddish. 

 Length, 10-12 mm. 



This species may be distinguished by the $ head being sub-triangular 

 from in front, the genal costa obsoletely elevated, rufescent frontal orbits, 

 the intermediate coxae closely punctate and slightly shining, the posterior 

 without tufts ; S with apex of clypeus broadly rounded, flagellum ferru- 

 gineous beneath, posterior tarsi immaculate flavous, frontal orbits and 

 post-scutellum generally flavous, parallel-sided abdomen, and with the 

 posterior femora rufescent before the base only. 



From /. exiensorius it may be known by its more slender build and 

 smaller size ; the petiole elevated between the spiracles ; the longer 

 nietathoracic areola, in both sexes only slightly emarginate apically ; the 

 dilated lower margin of the ? cheeks ; the colour of the $ head ; the 

 much elongated form of the $ ? scutellum, which is flavous rather than 

 white, 



/. improbus is a pale variety of this species, having the legs, including 

 the posterior coxae for the most part, flavous, and the central markings of 

 the abdomen extending from the second to fourth, with a mark on the 

 fifth, segments. /. (luadrilineatus is a similar variety with four longitudinal 

 viltae on the mesonotum, the carinae of the scutellum and the post-scu- 

 tellum flavous. 



