52 BRITISH ICHNEUMONS. [ Exvochus 

at all red-marked; the male he took at Felthorpe in Norfolk during the 
preceding month. It is only recorded elsewhere from Sweden, but is 
certainly not rare with us; and I have specimens taken at Nunton in 
Wilts. by Marshall and at Shere in Surrey by Dr. Capron. I met with it 
during four consecutive years, 1899—1902, in such varied localities as 
Felixtowe on the Suffolk coast, Kirtling in Cambridgeshire, by sweeping 
after dark at Winterton in the Norfolk Broads, and in the middle of 
Wicken Fen; it appears to be attracted to the flowers of Heracleum 
sphondylium as soon as they first open, about the 13th June, during which 
month alone | found it. 
ORTHOCENTRINI. 
Head transverse or more often buccate, more or less emarginate pos- 
teriorly, with the vertex narrow or somewhat broad behind the eyes; face 
more or less distinctly protuberant below the antennae, convex and some- 
times centrally deplanate ; clypeus not or very obsoletely discreted. 
Antennae filiform, shorter and stouter in 9; scape elongate. ‘Thorax 
gibbulous, with both sternauli and notauli cbsolete; pleurae usually very 
smooth; metathorax distinctly areated or with the areola entirely want- 
ing ; petiolar area nearly always complete and costulae always wanting. 
Scutellum somewhat convex. Abdomen oblong and in @ more or less 
apically compressed and basally sessile; basal segment never elongate, 
more or less entirely aciculate or alutaceous, and unevenly impressed ; 
seventh short and rarely as long as the preceding ; terebra either sub- 
concealed and reflexed or distinctly exserted and straight. Anterior legs 
normal, the hind ones subelongate and stout with their coxae compressed ; 
pulvilli elongate and onychium stout. Wings not very broad nor ample ; 
radial cell short ; areolet either pentagonal, subtrigonal or entirely want- 
ing. The size is never large, but some of the species are among the 
smallest of all Ichneumonidae, ranging from but one-and-a-half to at the 
most five millimetres. 
No doubt can still be entertained that this group is very closely allied 
in the structure of its head with the L:vochides, with which Ashmead con- 
sidered it to have been ‘‘ confounded,” though he could bring forward no 
better distinctions than the single one of its longer scape; and yet few 
features are available by which to separate it from the Ophionid Plec- 
fiscides, since the terebra is occasionally distinctly exserted, but the best 
of these is undoubtedly, as Thomson points out (O. E. 2420), the elongate- 
cylindrical scape. 
Holmgren says (p. 323) that the members of this group usually oviposit 
in larvae of Microlepidoptera; and in this Thomson concurs (O. E. 2421) 
but adds to their hosts the “ svampinsecter”’ (? Cynipidae). It will, how- 
ever, be seen from the following details that Longicorn and Heteromerous 
Coleoptera, Sawflies and Mycetophilid Diptera are also recorded hosts. I 
consider it most probable that they are attached to the M/ycefophilidae and 
that the beetles, etc., which have emerged from the same pabulum, have 
been mistaken for hosts. ‘This would relate them in their economy with 
Bassus, under which Gravenhorst placed them; though we do not yet 
know if the parasitism be external. 
Gravenhorst, who was peculiarly ignorant of this group, gives one 
species as British, and Westwood in 1840 professes to a knowledge of 
seven, giving Orthocent/rus anomalus, Grav., as type of the genus; but Des- 
