Stenomacrus | BRITISH ICHNEUMONS. 67 

Very like S. caudatus, but the Q has the face above and broad ver- 
tical dots pale, with nearly the whole of the second segment finely and 
scabriculously punctate ; and the male has the whole face, cheeks, frontal 
and vertical orbits, the propleurae, radical callosities and anterior coxae 
stramineous, with the hind coxae basally nigrescent. 
Gravenhorst tells us that Hope took it about Netley in Shropshire, but 
there are no subsequent records. It is certainly rare with us and I have 
only seen two beautiful females in Dr. Edward Capron’s Surrey collection ; 
Haliday, in his MS. diary, now in the Dublin Museum, says he found it 
commonly in Ireland. 
2. caudatus, Holmgr. 
Orthocentrus caudatus, Holmgr. Sv. Ak. Handl. 1855, p.350, excl. ¢ et var. 
Stenomacrus caudatus, Thoms. O. E. xxii. 2440, ¢ ?. 
A black species with the legs pale; ¢ mouth, face and anterior legs 
stramineous. Length, 2}—2? mm. 
This and the preceding species are placed in a group apart from the 
remainder of the genus by Thomson, who says they may be known by dis- 
tinct areolet, the petiole neither elevated nor bicarinate, the strongly 
developed pulvilli and the @ by the elongate abdomen. ‘The head is 
somewhat narrowed behind the eyes, the vertex very broad, antennae in 9 
spirally curled and not apically attenuate with postannellus cylindrical, 
stigma pale and emitting radius from its centre, radial cell not elongate 
and anal nervure emitted from centre of brachial cell; the 9 abdomen is 
strongly elongate and apically compressed with the terebra not extending 
beyond its apex, hind femora and tibiae very stout with the onychii and 
pulvilli strongly developed, the venter pale and the legs flavescent with 
the hind coxae sometimes darker. 
The peculiarly deplanate and broad basal segment, which is evenly 
rugulose and neither impressed nor bicarinate, will distinguish this female 
from the rest of the genus; the @ is similar to that of S. concinnus, in its 
oblique and postfurcal basal nervure, the black hind coxae and their often 
infuscate femora, but differs in having the anterior legs stramineous and 
the cheeks apically flavous; it is also similar to the ¢ of S. /ariczs, but is 
distinctly smaller and more slender with the pronotum black and vertical 
orbits immaculate. 
Capron found both sexes in Surrey and Piffard took a g in Herts; I 
swept a 9 at the Ventnor landslip, Isle of Wight, at the end of June, 
1907, and a couple of males from long grass in a dry ditch at Mildenhall, 
in Suffolk, towards the end of the following September. 
3. incisus, Grav. 
Orthocentrus incisus, Gr. I. E. iii. 361, ¢. 
Head black with the mouth, cheeks and the strongly convex face 
whitish. Antennae slender, filiform, a little shorter than the body and 
infuscate, becoming stramineous basally. Thorax gibbulous, with the pro- 
thorax and sternum fulvous. Abdomen subsessile, a little longer and 
narrower than the head and thorax, and somewhat dilated gradually 
towards the anus; basal segment dull and subsulcate, slightly constricted 
basally, nearly thrice longer than broad with the margin, like those of 
F2 
