64 BRITISH ICHNEUMONS. 
[ Picrostigeus 

of face testaceous, ¢ with face entirely stramineous. Antennae longer 
than half the body and basally paler beneath; basal flagellar joint 
cylindrical in both sexes. Thorax narrower than head, shining, black or 
brunneous with metanotal and petiolar areae usually distinct and com- 
plete. Abdomen a little longer than head and thorax, of ? somewhat 
compressed apically ; basal segment alutaceous or subscabriculous but 
not aciculate, hardly elevated basally, depressed on either side beyond its 
centre with very obsolete discal carinae; second to fifth segments 
shining, smooth and strongly transverse ; sixth and seventh far exserted ; 
terebra straight and as long as or slightly longer than the abdomen. Legs 
normal and testaceous or red; the anterior of @ stramineous; hind 
coxae always piceous and apically paler; hind tarsi apically, or some- 
times legs mainly, infuscate. Wings subhyaline, stigma and nervures 
pale piceous: radial nervure externally straight; areolet pentagonal and 
always entire; radial cell distinctly elongate; nervellus not angled. 
Length, 3—4 mm. 
The whole insect is usually brunneous, though sometimes black and at 
others ferrugineous. 
Holmgren’s ¢ appears to agree with his ? in its abdominal structure 
to a remarkable extent. This species is said by Thomson to be the 
largest of the three he assigns to this genus and to be known from the 
remainder by its less slender legs and antennae, and apically longer 
radial nervure; the ¢@ sometimes has the anterior legs stramineous and 
their femora rarely black-lined beneath, the hind coxae are always dark, 
sometimes with their tarsi and tibial apices concolorous. 
Frequent in Sweden at the end of August (Holmgren); common in 
Ireland (Haliday MS. in Dublin Museum). Females in my collection 
were captured at Whitby in Yorkshire on 24th August, 1867, by Alfred 
Beaumont; Felden in Herts by Albert Piffard; and Egloskerry in Devon 
by on 23rd July, 1882, by Bignell. Probably Bridgman’s records from 
Eaton and Earlham, near Norwich, and Crabtree Fort near Plymouth at 
the end of August, refer to the present species; there is a series in Mar- 
shall’s collection from Govilon in Monmouth, Botusfleming in Devon, 
Lastingham in Yorks, Cornworthy in Devon, and St. Albans; and I have 
seen a female beaten at Brockenhurst on 26th Feb., 1911, by Lyle from 
spruce fir. 
STENOMACRUS, Thomson. 
Thoms. O. E. xxii (1898). 2433. 
Head with the vertex not narrow; clypeus apically truncate and not 
covering the mandibles. Abdomen with the terebra rarely exserted, and 
then slender and curved. Wings with the radial nervure often emitted 
before centre of stigma ; areolet frequently wanting ; anal nervure emitted 
from centre or above centre of brachial cell; hind wings with the cubital 
nervure basally wanting and the nervellus vertical (not oblique), opposite 
or subpostfurcal, and neither geniculate nor intercepted. 
This genus is recognised by the position of the nervellus and basally 
obsolete cubital nervure of the hind wing; it comprises some of the 
smallest and most puzzling of all Ichneumonidae. 
These were almost indeterminable till Thomson published his revision 
of them in 1898, with the result that nearly the whole of our records 
before that time are worthless. He divided the genus into five main sec- 
tions, which I have not very exactly followed in the following table, since 
