304 BRITISH ICHNEUMONS. [ Polyblastus 
18. pyramidatus, Holmgr. 
Polyblastus pyramidatus, Holmgr. Sv. Ak. Handl. 1855, p. 219, ¢. 
Somewhat shining and black with the mouth, clypeus, scape beneath, 
tegulae and venter pale stramineous. Clypeus somewhat impressed before 
its rounded apex ; flagellum apically rufescent beneath. Metathorax with 
five distinct areae. Scutellum very strongly elevated, subpyramidal. 
Basal segment somewhat short, very finely rugose-punctate, with distinct 
carinae extending a little beyond its centre; incisures of the second and 
third segments pale. Legs red with the hind tarsi and tibiae alone black, 
and the latter centrally white-banded. Areolet triangular ; radial nervure 
apically a little curved ; nervellus intercepted below its centre. Length, 
4mm. 6 unknown. 
The subpyramidal scutellum and white-banded hind tibiae render this 
species quite distinct from the remainder of its genus. 
Boheman captured the type in Lapland. Our only record is by Bignell, 
doubtless upon Bridgman’s authority, “Captured at Longbridge, 27th 
June,” in Devonshire; the specimen is in the Plymouth Municipal 
Museum, to which Bignell presented his collection in tgog. 
19. bidentatus, Steph. 
Tryphon bidentatus, Ste. Ill. M. vii. 253, ¢. 
A black species with the abdomen centrally, and the legs mainly, red. 
Head transverse, not constricted posteriorly with the mandibles and apex 
of the discreted clypeus dull red; frons closely and evenly punctate. 
Antennae rufescent beneath. Thorax immaculate black, with the metano- 
tal carinae obsolete and costulae wanting. Scutellum pyramidal and dis- 
cally concave, black. Abdomen black and fusiform, with the second and 
third segments entirely, with apex of the first and margins of the fourth, 
bright red; basal segment very stout and broad, but little constricted 
basally, with the spiracular tubercles enormously developed and the dis- 
cal carinae extending beyond them. Legs red with the coxae, trochanters, 
hind femora and apices of their tibiae black. Wings with areolet tri- 
angular and sessile ; stigma piceous and basally whitish ; nervellus inter- 
cepted a little below its centre. Length,8 mm. 9 only. 
This description is drawn from the single female from Stephens’ 
collection, now in Mus. Brit., which has not been noticed since first 
described in 1835 and was said by its author (/oc. c7#.) to have been ‘ found 
in July near London.” 
ERROMENUS, Holmgren. 
Holmgr. Sv. Ak. Handl. 1855, p. 221. 
Head transverse; vertex somewhat deplanate and frons compressed 
above the scrobes ; face centrally subelevated ; clypeus deeply discreted ; 
mandibles broad with subequal teeth. Antennae simple, somewhat stout 
and shorter than body, with about twenty-seven flagellar joints. Thorax 
stout, gibbulous and a little longer than high; sternum very short and 
