212 BRITISH ICHNEUMONS. [ Exenterus 


It is closely allied to 2. mz/igosus, but with the face black, extreme apex 
of scutellum usually testaceous, abdomen nearly entirely red with lateral 
margins sometimes narrowly infuscate and the apical margins of the anal 
segments broadly pale. 
An abundant species with us though not introduced till 1889 (Tr. Ent. 
Soc. p. 434) and even then doubtfully, since Bridgman’s pair from Eaton 
and Brundall in May and June had the hind coxae almost entirely, the 
intermediate basally and the anus entirely, black. Later (Trans. Norf. 
Soc. v, p. 627) the doubt is no longer apparent. Cornworthy in Devon 
(Marshall coll.) ; Felden in Herts. (Piffard); Tostock in Suffolk, early in 
June, 1900 (Tuck). I have always taken it by sweeping, usually in moist 
situations, in Tuddenham Fen late in May, in Herringswell Fen early in 
June, and at Monks’ Soham towards the end of August. 
14. mitigosus, Grav. 
Tryphon mitigosus, Gr. I. E. ii. 258, 93; cf. 1. Suppl. 689; Ste. Ill. M. vii. 254, 
g. Exenterus limbatus, Holmgr. Sv. Ak. Handl. 1854, p. 72; 1855, p. 241 ; 
1856, p. 389, ¢ ?. Cteniscus limbatus, Brisch. Schr. Phys. Ges. Konig. 1871, 
p.98, ¢ ?. Tryphon flavomaculatus, Ste. Ill. M. vii. 253 (part.). 
A shining, punctulate, shortly pubescent, black species with the 
abdomen broadly red. Head shining, broader than thorax but not 
dilated posteriorly ; mouth, clypeus and the transverse face flavidous, the 
last black-marked below scrobes; clypeus convex and slightly impressed 
before its rounded apex. Antennae somewhat shorter than body, 
nigrescent and beneath rufescent with the basal joints flavidous. Thorax 
immaculate with five upper metathoracic areae, of which the areola is 
elongate. Abdomen subclavate and black with the parallel-sided second 
to fourth or fifth segments mainly red and apical margins of the anal seg- 
ments flavidous; basal segment margined, gradually dilated apically, 
twice longer than broad, with prominent spiracles and the discal sulcus 
distinct. Legs slender and pale red; trochanters and anterior coxae 
flavidous; ¢ with hind femora rarely infuscate. Wings with tegulae 
flavidous, areolet petiolate and nervellus intercepted below its centre. 
Length, 6-—7 mm. 
This species is very like 2. pzcfus, but with the head not dilated pos- 
teriorly, the radial nervure not quite straight and the hind femora nearly 
always entirely red. 
Holmgren’s LZ’. “imbatus was for long thought to be synonymous only 
with the second variety of Gravenhorst’s species; but Pfankuch found 
that to be no more than a form of the type, and 7. flavomaculatus with 
white face to be its male, erroneously termed female by its author. It is 
probably the latter, therefore, which Stephens “found at Darenth Wood 
in July,” while his very different Z\ subfasciafus appeared hardly distinct 
to Marshall and was also taken near London, in June. Gravenhorst re- 
ceived the typical form from Hope, who took it at Netley in Shropshire. 
In ignorance of this synonymy, Bridgman introduced the species as new 
to Britain (Trans. Ent. Soc. 1889, p. 435) on the strength of a pair taken 
by him at Brundall in Norfolk at the end of June and in Cambs. early in 
August; and tells us that he bred Z. mitigosus, which he nevertheless 
