44 BRITISH ICHNEUMONS. [ Exochus 

elongate, the hind internal nearly reaching apical third of metatarsus, the 
external not or hardly shorter than breadth of its tibial apex. Wings 
slightly clouded, stigma and radius infuscate; radix and tegulae pale 
flavous, the latter in ? internally infuscate. Length, 7—74 mm. 
Known by its postfurcal basal nervure, distinct notauli, outer hind calcar 
as long as apical breadth of tibia, entirely pale ¢ face, 9 immaculate 
frontal orbits and pale facial fascia. The ¢@ is similar to that of 
£. gravis, but with the abdomen a little stouter and immaculate; the 9 
is like that of /. consimilis but has the second segment laterally more dis- 
tinctly and coarsely punctate and flavidous anteradical callosities always 
present ; the areola is apically rounded and @ face broader. It is of the 
structure and almost the size of /. gravipes, but the intermediate calcaria 
are strongly unequal in length, the lower basal nervure very evidently 
postfurcal, the @ has a sometimes laterally abbreviated facial fascia and 
the ¢ has the mouth and face and anterior coxae and nearly always apex 
of the scutellum pale flavous. 
Certainly this species is not very frequent with us. Not common about 
London in June (Stephens); Exeter in the middle of August (Bignell) ; 
Tarrington in Hereford in August (Yerbury); bred from a species of 
Tortrix by Butler (Entom. 1881, p. 141). I have several specimens found 
about Felden in Herts and Shere in Surrey by Piffard and Capron ; Tuck 
took it at Tostock in Suffolk during June, 1900, and it has occurred to me 
on a window-pane at Blakenham in the same county in mid-August, at 
Lyndhurst in the New Forest early in August, and, dead, in a greenhouse 
at Ryde, Isle of Wight, in October. Bridgman does not mention this 
species from Norfolk, but says that 4. consimilis, Holmgr., with which 
Thomson erroneously synonymized it in 1887, has been captured at Baw- 
sey Heath by Atmore and bred from Homoeosoma nimbella by W. Fletcher ; 
it has also been reared from Pronea olivalis in France. 
18. nigripalpis, Thoms. 
Exochus nigripalpis, Thoms. Deut. Ent. Zeit. 1887, p. 209; O. E. xix. 2132, 
i) Ee 
Black. Antennae filiform and somewhat elongate; notauli distinct; 
costulae stout. Femora and tibiae red, hind tarsi nigrescent and 2 coxae 
black. Length, 6—7 mm. 
A little smaller than 2. gravzpes with the vertical pale dots sometimes 
obsolete and differing in the much shorter intermediate calcaria, usually 
entirely black tegulae and slightly postfurcal basal nervure. From £. pro- 
sopius it may be known by the antennae not being apically attenuate, the 
apical nervure apically slightly curved, the calcaria shorter, g face and 
scutellum black with the former at most sometimes pale above. With 
£. consimilis, Holmgr., which is only known as British from Bridgman’s 
record (supra) doubtless referring to the present species, it agrees in 
having the vertex short and constricted posteriorly, the face not strongly 
punctate, the vertical pale dots small or obsolete, the antennal flagellum 
slender and somewhat elongate, the femora and tibiae red with Q coxae 
black, stigma narrow and the radial nervure neither elongate nor quite 
straight; but Thomson says it differs in such trivial points as the apically 
paler palpi, slightly longer notauli, apically paler hind tarsi, pale-marked 
tegulae and more broadly punctulate ¢ second segment; I consider them 
