BRITISH ICHNEUMONS. 229 



10. semirufus, Desv. 



HopHsfiieiiiis seiiiirufiis, Desv. Cat. 50, ? . Platylahns seviirufits, Rridg. -Fitch, 

 Entom. iSSi, p. 20S ; Berth. Ann. Soc. Fr. 1S96, p. 331,? ; cf. Mori. E. M. .M. 1902, 

 p. 123. 



Head black, narrowed behind the eyes ; clypeus somewhat broadly 

 rounded in front, not discreted from face ; frons not canaliculate ; cribrary 

 organs fuscous ; frontal and vertical orbits narrowly flavous. Antennae 

 black, slender throughout, centrally white-banded. Thorax and the some- 

 what deplanate scutellum closely punctate, dull and entirely black ; ster- 

 nauli wanting ; areola sub-circular, slightly longer than broad, apically 

 emarginate ; costulae and apophyses wanting ; petiolar area entire, not 

 discreted ; spiracles elongate, equilateral. Abdomen closely punctate, 

 dull, elongate-ovate ; first three segments and base of fourth red, remainder 

 black ; post-petiole scabrous ; gastrocaeli sub-obsolete ; (the production of 

 the fifth ventral segment is accidental) ; terebra slightly exserted. Legs 

 piceous ; front femora apically and their tibiae internally white ; posterior 

 tibiae somewhat ferrugineous basally. Wings hyaline ; tegulae piceous, 

 radix and stigma fulvous ; areolet pentagonal, its sides convergent, though 

 not coalesced, above. Length, 8 mm. 



This species, of which the male is at present unknown, is closely related 

 to P. Sia//ii, Holmgr., in its elongate, equilateral spiracles, black and red 

 abdomen, immaculate thorax and anus, sub-obsolete gastrocaeli, and entire 

 frons, but differs in the conformation of the petiolar area, scabrous post- 

 petiole, posteriorly narrowed head, as well as in the colour of the scutellum 

 and post-scutellum, stigma and hind femora. 



No one has recorded this species since Desvignes' time, and there is 

 but a single example from his collection, without locality, in the British 

 Museum. It is quite possibly known on the Continent under a different 

 name, with which, it is hoped, the above description, drawn directly from 

 what appears to be the type specimen, will aid to associate it. 



II. orbitalis, Gi-av. 



Ichneumon orbitalis, Gr. I. E. i. 490; Ste. 111. M. vii. 191, i. Platylahns orbitalis, 

 Wesm. Nouv. M(5m. Ac. Brux. 1844, p. 158; Holmgr. Ichn. Suec. ii. 322; Thorns. 

 O. E. xi.x. 21 10; Berth. Ann. Soc. Fr. 1S96, p. 324, i ?. Var. /. suhaihelliis, Gr. I. E. 

 i. 338 ; Ste. III. M. vii. 171, ? ; cf. Wesm. Mem. couron. Ac. Belg. 1859, p. 39. Var. 

 /. pcrsectttor, Gr. I. E. i. 491 ; Ste. 111. M. vii. 191 ; We.sm. M6m. couron. Ac. Belg. 

 1859, p. 62, i . 



Head black, somewhat narrowed behind the eyes ; frons deplanate, 

 closely alutaceo-punctate, scrobes small and lunate ; clypeus laterally 

 rounded ; ? with facial, external and rarely a dot at the vertical orbits, 

 narrowly white ; $ with all the orbits white. Antennae slender, apically 

 attenuate ; white-banded in both se.xes ; of ? slightly incrassate beyond 

 the centre. Thorax black, often with two white dots on the pronotum ; 

 mesonotum dull, coarsely punctate ; areola transverse ; costulae more or 

 less complete ; apophyses obsolete ; spiracles elliptic. Scutellum white, 

 its lateral carinae extending beyond the centre. Abdomen sub-cylindrical, 

 black ; the four basal segments red or castaneous ; the last two narrowly 

 pale-margined ; petiole short ; post-petiole nearly glabrous and nilidulous, 

 carinae fine and distinct ; gastrocaeli somewhat large and sub-circular, 

 intervening space often scabriculous, as broad as centre of post-petiole ; 



