Exochus | BRITISH ICHNEUMONS. 35 
of opposite side), bifid with the upper very slightly the longer tooth, some- 
what longitudinally punctate and a little uneven, about as broad as 
clypeus ; maxillary palpi cylindrical and flavous; labial palpi nearly as 
long as maxillary, also flavous and cylindrical. Antennae short with the 
scape moniliform; basal flagellar joint cylindrical and elongate, second a 
little longer, and third as long as first; remainder distinctly transverse, 
piceous and becoming ferrugineous basally. Thorax black ; mesothorax 
with evenly scattered punctures and piceous hairs, shining, bordered 
throughout ; mesopleurae very finely punctate, glabrous and produced 
posteriorly into obtuse teeth ; mesosternum a little more closely punctured 
and very slightly convex with the interpectoral sulcus smooth, narrow, 
trans-striate and basally bordered ; metathorax glabrous, with ferrugineous 
hairs on either side of the complete and elongate areola; costulae want- 
ing ; petiolar area short with its basal carina entire but not laterally pro- 
duced ; spiracles ovate and not small. Scutellum black, punctate, nitidu- 
lous, somewhat large, flat, very finely bordered, with recumbent pilosity 
towards its apex. Abdomen black and strongly glittering, apex finely 
pilose, puncturation obsolete; first segment gradually narrowed from apex 
to base, discally bicarinate basally, sulcate between carinae and some- 
times foveate before apex; two basal and base of third segment finely 
margined laterally and very finely punctate laterally, with fourth segment 
the broadest; three basal ventral segments flavous-plicate. Legs in- 
crassate, rufescent, punctate, pubescent and somewhat dull; the deplanate 
coxae, short trochanters and anterior femora more or less piceous; hind 
femora usually black with their apices piceous. Wings hyaline; areolet 
somewhat large, obliquely transverse and but slightly petiolate, emitting 
recurrent nervure far beyond its centre; radius emitted from centre of 
stigma, which is black with paler base; nervures piceous, radix and tegulae 
fulvous. Length, 45—6 mm. 
Easily recognised by its mainly black coxae and often femora, some- 
what curved basal segment which is only about a quarter as long again as 
apically broad, with the second a little longer than broad, the third 
laterally finely but distinctly punctulate and the remainder discally glab- 
rous with their sides sparsely pubescent, and by the somewhat large 
areolet which is but slightly petiolate and externally a little curved. 
Common throughout Europe, living in caterpillars of Z?nea populella, 
Tortrix and Lithocolletis, according to Ratzeburg and Vollenhoven. Not 
uncommon about London and in Shropshire (Stephens) ; taken at Lynn 
in Norfolk by Atmore (Bridgman) ; and bred in Devonshire on 18th Sep- 
tember from Symaethis oxyacanthella (Bignell). I have it from Bugbrooke 
in Northants, Cornworthy in Devon, Botusfleming in Cornwall (Marshall), 
Shere in Surrey (Capron), Felden in Herts (Piffard) and York, where 
Bankes bred two females in 1905 from larvae of Hupzthecia /risignata, Hs. 
It has occured to me in Wicken marshes on sallow in Cambs. in June, 
and not uncommonly both in the Bentley Woods near Ipswich on hazel 
bushes and at Wilverley, Denny and Brockenhurst in the New Forest, 
from the end of May to 19th June; Gravenhorst found it in August. 
D2 
