Orthocentrus | BRITISH ICHNEUMONS. 59 

O. sannio is new to our fauna, though five males have stood in Dr. 
Capron’s collection, under Bridgman’s manuscript name, some twenty 
years and these were doubtless captured by the former in the neighbour- 
hood of Shere, in Surrey. It is not infrequent in Sweden, occurs in 
Prussia, and de Gaulle says (Cat. Hym. 55) that in France it has been 
bred from a species of the Tenthredinid genus Vema/us. 
6. monilicornis, Thoms. 
Orthocentrus monilicornis, Holmgr. Sv. Ak. Handl. 1855, p. 332, ¢ ¢ (?); 
Thoms. O. E. xxii. 2426, ¢. 
Black. Head with the vertex narrow ; frons immaculate and very finely 
punctate below the ocelli; face of Q finely and transversely aciculate- 
punctate, of ¢ punctate and somewhat dull; ¢ with face to shortly above 
scrobes on either side, and the cheeks, flavous. Antennae of 2 with the 
basal flagellar joint subtransverse. Thorax of g with prosternum and 
large callosities before radices flavous. Legs rufescent with the hind 
ones often partly subinfuscate, and the anterior of d¢@ stramineous. 
Wings with the areolet somewhat regularly pentagonal, not broader than 
high and elongately sessile; nervellus geniculate at its lower fourth, but 
not intercepted. Length, 3—44 mm. @? ¢. 
It differs from all the preceding species in its black frons which is sub- 
convex and very finely punctate (not glabrous) below the ocelli, in the 
subtransverse basal ? flagellar joint and in the hind pulvilli being as long 
again as their somewhat slender claws. 
Holmgren says of his species ‘‘fronte ante laevissima,’”’ but I do not 
consider it improbable that it is synonymous with that of Thomson, which 
is only punctate immediately below the ocelli and not at its apex; nor 
am I at all satisfied that my @, which has the prosternum broadly pale, is 
that of the former author, but in both cases the association is purely 
arbitrary. 
Mr. Albert Piffard used to take this species not uncommonly at Felden 
in Herts, though he had none named, Tuck found a female at Tostock in 
Suffolk, during July, 1900, and there is also a male in Dr. Capron’s 
collection from Shere in Surrey. It has not before been noticed in 
Britain, though common in Lapland during August and September ; and 
seven specimens in Marshall’s collection, mixed with O. fronfator, are 
from Botusfleming in Cornwall and Cornworthy in Devon. It occurs 
beneath lime leaves in my garden at Monks’ Soham in July and August, 
and I have seen it investigating rose leaves at the end of the latter month. 
7. attenuatus, Holmer. 
Orthocentrus attenuatus, Holmgr. Sv. Ak. Handl. 1855, p. 330; Thoms. O. E. 
xxii, 2428, ¢. 
Black. Head not very narrow vertically, with face granuately punc- 
tate and below the scrobes transversely stramineous; mandibles and 
palpi white. Antennae with the postannellus transverse and subtriangular, 
and the flagellar joints ferrugineous beneath. Abdomen with the basal 
segment not bicarinate, the second very finely alutaceo-strigose, the third 
not transverse and the following gradually more strongly compressed to 
