BRITISH ICHNEUMONS. 227 



Head black ; cheeks and temples slightly dilated ; clypeus closely and 

 distinctly punctate ; frons finely punctate, centrally canaliculate ; vertical 

 dots rarely white ; $ with lateral clypeal dots, internal and external orbits, 

 stramineous ; S with cribrary organs, clypeus, face and apices of the 

 cheeks, also pale. Antennae slender, elongate; scape pale beneath ; of? 

 white-banded. Thorax black ; pronotum, lines before and beneath the 

 radix, stramineous or flavous ; apex of metathorax rarely white ; areola 

 transverse ; costulae and coxal areae entire ; apophyses small and feeble, 

 often surmounted in ? by a flavous dot ; spiracles elongate-oval. Scutelluni 

 centrally flavous ; post-scutellum often red. Abdomen black ; all the 

 segments, except sometimes the fourth, more or less apically margined 

 with white, the apical often obsoletely so in S ; post-petiole more or less 

 rugose, apically rounded and occasionally bimaculate ; gastrocaeli and 

 thyridii large and deeply impressed ; ventral segments two and three, but 

 not the fourth, plicate ; ultimate of $ nearly concealing the not exserted 

 terebra. Legs black ; anterior coxae sometimes marked with, and a patch 

 above the hind ones, pale ; anterior femora and tibiae red or fulvous, the 

 latter flavous laterally ; hind tibiae piceous, laterally whitish and their 

 coxae often white-marked. Wings hyaline, stigma nigrescent, radix pale ; 

 tegulae fuscous, white-dotted ; areolet deltoid, coalesced above. Length, 

 9-10 mm. 



This species is closely related to the last, but may be at once known by 

 the second and third ventral segments alone plicate, and by the large and 

 deep gastrocaeli ; from P. variegatiis it differs in the much smaller apo- 

 physes and in having the apex only of the sixth and seventh segments 

 white. 



Bridgman bred this species, which is uncommon on the Continent, 

 occurring in Prussia and Sweden, from Cidaria silaceata (taken at ^^^orthing 

 by Fletcher), in the middle of May ; and Brischke from an unidentified 

 Geometrid ; the only indigenous record of which I am aware is Stephens', 

 who says he took it rarely, near London, in June. 



8. tenuicornis, Grav. 



Ichneumon tenuicornis, Gr. I. E. i. 11^, 6 9, excl. var. i ; Ste. 111. M. vii. 128. 

 Platylabus tenuicornis, Wesm. M6m. couron. Ac. Belg. 1859, p. 10 ; Holmgr. Ichn. 

 Suec. ii. 309; Thorns. Ann. Soc. Fr. 1888, p. 123; Berth, lib. cit. 1896, p. 320; 

 Thorns. O. E. xix. 2106, S 9 . P- "igef, Wesm. Nouv. ^leni. Ac. Brux. 1S44, p. 155, 

 9 ; Bui. Ac. Brux. 1853, p. 310, (^ ? . 



Head black, hardly constricted behind the eyes ; temples sub-buccate 

 and, with the cheeks, clothed in piceous pubescence ; clypeus convex, 

 apically sub-truncate and laterally rounded ; frons strongly nitidulous, 

 scrobes large ; apices of the cheeks and the internal orbits, more broadly in 

 6 , white ; the vertex immaculate. Antennae slender, slightly compressed 

 centrally and white-banded. Thorax entirely black ; areola transverse ; 

 costulae and coxal areae obsolete ; apophyses short and distinct ; spiracles 

 oblong. Scutellum sometimes apically white. Abdomen elongate, black, 

 with the apical segments occasionally with pale membrane ; petiole some- 

 what short, deplanate ; post-petiole quadrate, basally bicarinate and rugose, 

 but sub-glabrous towards its apex, with prominent spiracles ; gastrocaeli 

 strongly transverse, somewhat deeply impressed, intervening space rugulose 

 and much narrower than centre of post-petiole ; terebra slightly exserted. 



