Orthocentrus | BRITISH ICHNEUMONS. 57 

1881, p. 92), who says: “Last May Mrs. Hutchinson sent me, from 
Herefordshire, a piece of a boletus, growing on a pear tree, with some 
small pupae enclosed in a white silken web. In June I was successful in 
rearing from them a pair of Laszosoma (Sctophila) lutea, Macq., and also a 
pair of its parasite, which Mr. Bridgman considers to be Holmgren’s 
Orthocentrus corrugator.’ There are two males and a female from Shere 
in Surrey in Dr. Capron’s collection, which confirm it as British. 
3. marginatus, Holmgr. 
Orthocentrus marginatus, Holmgr. Sv. Ak. Handl. 1855, p. 327; Thoms, O. E, 
Xx. 2425. ¢ ¢ . 
Black, with the legs red and the hind coxae and femora sometimes in- 
fuscate or black; areolet sessile and nearly pentagonal; Q with basal 
flagellar joint triangular and a little longer than the quadrate second; @ 
with the frontal orbits below, whole face and cheeks very broadly, cal- 
losity before radix and the prosternum, with the anterior legs, stramineous. 
Incisures of the scabriculous three basal segments narrowly testaceous. 
Length, 44—5 mm. 
This species agrees with O. frontafor, Zett., in having the postannellus 
not longer than broad and not linear, the frons apically smooth and female 
orbits pale-marked, but differs therefrom in the broadly sessile areolet and 
the g immaculate pronotum ; the immaculate vertical and upper frontal 
orbits will distinguish it from O. corrugafor, and the strongly sculptured 
second segment renders the Q distinct from O. s/igmaticus, to which the 
6 is remarkably similar. ‘These males, however, will be found distinct in 
the slightly broader vertex of the present species, its bordered occiput, 
pale frontal orbits, much longer antennae (body 5 mm., antennae 44mm.) 
which are paler above, the entirely flavous prosternum, pale-lined pro- 
pleurae, entirely wanting notauli, the two basal and base of the third seg- 
ment much more strongly strigose, the first not or hardly discally carinate 
though centrally subsulcate, hind tibiae almost white basally, 
first discoidal cell less acute apically, areolet broad-pent- 
agonal and less irregularly oblique, more broadly sessile, the 
radial cell longer, basal radius very much longer than the 
regularly triangular though hardly smaller stigma. 
This species is of frequent occurrence in Sweden, but our only in- 
digenous record is by Bignell, who captured it at Bolt Head in Devon on 
6th July. I have, however, seen the two males taken by Bridgman at 
Brundall and Earlham in Norfolk, in his collection in the Norwich 
Museum (cf. Trans. Norf. Nat. Soc. 1893, p. 628) and am of the opinion 
that they are referable to the present species, though he considered them 
to represent either the still unknown alternate sex of O. /ongicornis, 
Holmgr., or a new species. This species is certainly uncommon with 
us; I have twice taken the male, which strongly resembles a small 
Pimpla on the flowers of Heracleum in a lane at Dodnash woods in 
Suffolk on 8th August, 1899, and on the leaves of an aspen at Hemel 
Hempstead in Herts on 9th August, 1903. Wilson Saunders took a male 
at Reigate in Surrey, August, 1872, and there is a long series in Capron’s 
collection from Shere, in the same county. Marshall’s series of O. mar- 
ginatus was entirely composed of O. fron/ator and O. monilicornis. 
