Orthocentrus | BRITISH ICHNEUMONS. 63 


é and the ventral plica of 9 flavous. Legs red; anterior of g nearly 
entirely, with the hind trochanters and base of tibiae, flavous and the 
hind tarsi subinfuscate; Q with coxae, femora and apices of hind tarsi 
more or less piceous; hind pulvilli longer than the stout claws. Wings 
subhyaline with the stigma infuscate and tegulae flavous; radial nervure 
externally straight; areolet large, pentagonal and sessile; nervellus inter- 
cepted below its centre. Length, 4—5 mm. 
Thomson distinguishes this species from the two following by the lack 
of all 9 genal sulci and by the ¢ having the mouth, face, callosity before 
radices and margin of the prosternum pale, the basal abscissa of the radial 
nervure straight, longer than the second and hardly a third the length of 
the third. 
Both sexes sometimes have the legs red with the hind coxae partly 
black, or the Q legs may be entirely red or red with the hind coxae 
nearly entirely black and their femora concolorously lined; the second to 
third or fourth incisures are sometimes pale and the tarsi often infuscate. 
It is common from July to September in Sweden (Holmgren); not 
infrequent in subarctic Europe (Roman); Germany (Brischke), Austria 
Strobl), and France (Gaulle); it also occurs in the northern latitudes of 
Asia and America. It has not hitherto been noticed in Britain and I can 
instance but a single g, which I beat from Pinus sylvestris—along with 
O. stigmaticus—at Elvedon in Suffolk on 4th May, 1907, and a @ taken by 
Lyle in the New Forest at the blossom of Luphorbia amy gdaloides as early 
as 24th April. 
PICROSTIGEUS, Thomson. 
Thoms. Opusc. Ent. xxii (1898), 2430. 
Head with vertex not narrow; face very finely punctate and not short; 
genal sulcus impressed; clypeus apically subtruncate and not concealing 
mandibles. Antennae of 9 with postannellus not transverse. Abdomen of 
? with the second segment large and transversely impressed; terebra 
elongately exserted. Legs not stout nor pulvilli longer than claws. Wings 
with the anal nervure emitted from centre of brachial cell and radius from 
centre of stigma; areolet usually entire and shortly pentagonal; hind 
wings with cubital nervure distinct to base, the nervellus vertical and not 
geniculate. 
The species of this genus are easily known in the female sex by the 
strongly exserted terebra, but the males are very liable to be confused 
with those of the next genus. 
Thomson here includes three species and I know of no additions; but 
these are so closely related zw/er se that I entertain some doubt respecting 
their value, and prefer to consider as British only that which has for so 
long stood in our lists. 
1. anomalus, Holmer. 
Orthocentrus varius, Holmgr. Sv. Ak. Handl. 1855, p. 335, ¢ (?). O. anoma- 
lus, Holmgr. Jib. cit. p. 351, excl. ¢ (nec Grav.). Picrostigeus recticauda, 
Thoms: O2E. xxii. 2481, 3°39": 
Head not narrowed posteriorly ; vertex normally emarginate; frons 
smooth and subimpressed in front, convex and finely punctulate around 
the ocelli; face protuberant and hardly shining ; mouth and basal margin 
