74 BRITISH ICHNEUMONS. [ Stenomacrus 

At once known by its narrow, luteous stigma emitting the externally 
straight radial nervure from its centre. 
It is said to be uncommon in damp meadows during August on the 
Continent. First recorded with us in 1898 by Bignell, who took it at 
Bickleigh in Devon early in June; he has given me specimens thence 
and from Exeter, found in September; and Capron took it about Shere 
in Surrey. The @ has only thrice occurred to me in Suffolk: swept in 
Oulton Broad at the end of August, 1898; on flowers of Angelica sylvestris 
at Barton Mills at the end of August, 1900; and on reeds in the South- 
wold salt marshes, at the beginning of September, 1907. 
13. cognatus, Holmgr. 
Orthocentrus cognatus, Holmgr. Sv. Ak. Handl. 1855, p. 344, ¢ ¢. 
Head very smooth, subbuccate and a little dilated behind the eyes; 
face normally prominent; mouth and in 9 upper facial margin testaceous, 
6 also with the whole face flavous. Antennae filiform, somewhat longer 
than half body, basally dull testaceous and in @ a little stouter apically ; 
basal and second flagellar joints of equal length, with the former hardly 
twice longer than broad. ‘Thorax black and shining; areola and petiolar 
area in Q distinct, in ¢ subobsolete. Abdomen immaculate ; basal seg- 
ment not very broad, somewhat convex, laterally impressed beyond the 
centre, with the broadly separated carinae more distinct in 9; two basal 
segments scabriculous throughout and the remainder very smooth; ventral 
plica basally pale; terebra not exserted. Legs dull testaceous, with the 
subincrassate hind femora and coxae piceous; the anterior femora, hind 
tarsi and apices of their stout tibiae infuscate. Wings subhyaline with the 
tegulae stramineous, nervures and narrow stigma pale; radial nervure 
somewhat curved at both extremities. Length, 2} mm. 
This species will be recognised with us as the only one with transverse 
head, no areolet and the apically curved radius emanating from the centre 
of the narrow and pale luteous stigma. It is said to be similar to S. /77s/zs, 
Holmgr., in colour and conformation but to differ in having the basal 
flagellar joint shorter, the head more buccate and the second segment 
scabriculous throughout. 
In 1898 Bignell recorded it from Plym Bridge early in August and 
Bickleigh on z1st October, in Devon, on Bridgman’s authority. It is 
certainly a common garden insect in Suffolk, where I have taken as many 
as thirteen females sitting and walking beneath the leaves of a lime tree 
in thundery weather, together with S. de/e‘us and S.concinnus at 6 p.m. on 
May 24th, 1908, at Monks’ Soham, as well as on house-windows on Octo- 
ber 16th; a g@ occurred to me at Brandon towards the end of August, 
1906; Capron has given it me from Surrey, Bignell from Devon and 
Newbery from Crawley in Sussex and Tilgate Forest in 1902. 
14. exerens, Thoms. 
Stenomacrus exerens, Thoms. O. E. xxii, 2448, 3 ¢. 
A black species with the head cubical, legs pale, hind coxae black, 
radial nervure emitted almost before centre of the pale stigma; hind 
pulvilli not longer than their claws; ¢ with mouth and face pale; 9 with 
terebra nearly as long as the basal segment. Length, 24—3 mm. 
