Exochus | BRITISH ICHNEUMONS. 51 

29. septentrionalis, Holmgr. 
Exochus septentrionalis, Holmgr. Ofv. 1873, p.72; Thoms. O. E. xix.2137, ¢. 
(?) E. septentrionalis, Bridg. Trans. Ent. Soc. 1882, p. 160, ¢. 
Q. A stout shining black species. Head somewhat constricted 
posteriorly, with the vertical dots flavidous ; frons impressed in front on 
either side, with the central triangular elevation indeterminate and orbits 
immaculate. Metathoracic costulae obsolete. Abdomen with first seg- 
ment broad and but shortly carinate; the four basal segments obsoletely 
punctate. Legs black with the hind femora entirely, the anterior apically 
and the tibiae red; hind tibiae infuscate at their extreme base; all 
femora strongly incrassate ; external hind calcaria short. Wings with the 
stigma pale infuscate, radix infuscate-testaceous and tegulae nigrescent ; 
basal nervure not continuous. Length, 6 mm. 
3. Differs from the above description only in having the red femora 
apically black ; the front tibiae and tarsi rufescent with their apices black ; 
the intermediate tarsi nigrescent ; and the coxae and trochanters piceous 
or badious, with the latter apically red. 
Holmgren knew two females from southern Lapland and Bridgman two 
males, which he thought might perhaps constitute the alternate sex of 
this species, from Clober and Cadder in Scotland ; but the association of 
the sexes is very doubtful and the inclusion of Holmgren’s species as 
British consequently needs confirmation. I have seen nothing like it. 
It is said to be similar to #. Fletchert and EF. punctus, Holmgr., but of 
stouter conformation with the hind femora entirely red. 
30. albicinctus, Holmgr. 
Exochus albicinctus, Holmgr. Ofv. 1873, p.71, ¢ ; Thoms. Deut. Ent. Zeit. 
1887, p. 217, ¢ ¢ ; cf. Bridg. Trans. Ent. Soc. 1882, p. 160. 
A nitidulous, black species with the legs mainly concolorous, and hind 
tibiae basally white. Head, including the mouth, entirely black or with 
a small pale fascia below the scrobes ; vertex broad, but declived behind 
eyes ; cheeks compressed, with costa continuous ; mandibles a little nar- 
rowed apically, with the teeth of equal length. Antennae and thorax 
black ; areola apically dilated, with the costulae of ¢ emitted beyond its 
centre and of 9 obsolete. Scutellum immaculate. Abdomen black with 
carinae of basal segment extending a little beyond its centre, and the 
three following segments finely and sparsely punctate. Legs unusually 
dark ; femora black with the front ones except basally, the posterior at 
their apices, red ; the hind ones sometimes centrally subrufescent ; tibiae 
red with the hind ones broadly at their apices and narrowly before the 
basal white band nigrescent; tarsi dull testaceous; calcaria not very 
short, white with apices of the hind ones black. Wings with stigma in- 
fuscate, and the lower basal nervure but very slightly potstfurcal. Length, 
54—6 mm. 
Remarkable for its immaculate vertex and black femora; and differs 
from £. niger, Bridg., in its distinctly infuscate hind tibiae, punctate 
abdomen and darker mouth, though it appears extremely closely allied in 
all salient characters. 
Bridgman first discovered the female sex, at Wimbledon in Surrey 
during July, 1881, and says that in this example the hind tibiae were not 
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