Exenterus| BRITISH ICHNEUMONS. 205 


radices and distinct notauli; metanotum nearly smooth, pilose with cos- 
tulae strong and areola elongate. Scutellum and postscutellum red ; 
frenum narrowly whitish. Abdomen somewhat broad and very smooth, 
black with all the segments margined with dull white; basal segment 
short, broad, laterally margined, discally subglabrous and_bicarinate 
nearly to its apex; terebra subexserted. Legs bright red; anterior tibiae 
internally, and trochanters, flavous; hind tibiae pale fulvous, basally 
whitish, with their stout apical half and tarsi black. Wings ample and 
hyaline; tegulae flavous; areolet triangular and petiolate ; nervellus ante- 
furcal, intercepted below its centre. Length,7 mm. d unknown. 
This description is amplified from the Darenth type in the British 
Museum. 
“Rare: taken in June at Darenth wood” (Stephens). A specimen 
from Barnstaple in Devon, in Marshall’s collection, is correctly referred 
by him to this species. 
3. marginatorius, Fab. 
Ichneumon marginatorius, Fab. E. S. ii. 145; Jur. Nouv. Méth. 110, ¢; Gr. 
Nov. Act. Acad. 1818, p. 284. JI. amictorius, Panz. F. G. vii. 80; Jur. Nouv. 
Méth. 109, ¢; Gr. Nov. Act. Acad. 1818, p.285. Cryptus marginatorius, Fab. 
Piez. 76; Trentep. Isis, 1829, p. 864. Bassus amictorius, Panz. Krit. Revis. ii. 
74. Tryphon marginatorius, Gr. 1. E. ii. 191, excl. var. 2; Ste. Ill. M. vii. 242 ; 
Blanch. Hist. Nat. Ins. ili. 308. Exenterus marginatorius, Htg. Jahresb. 1838, 
p. 270; Schidd. Guér. Mag. 1839, p. 12, nota; Ratz. Ichn.d. Forst. i. 107 ; ited 
iii. 121; Holmgr. Sv. Ak. Handl. 1855, p. 230, ¢ ¢; Voll. Pinac. pl. xlii, fig. 8; 
Thoms. O. E. ix. 887, ¢ ¢. Cteniscus marginatorius, Brisch. Schr. Phys. Ges. 
Konig. 1871, p.97, ¢ ¢. 
Pubescent, punctate, a little shining and black with pale-fasciated 
abdomen. Head tumidous, coarsely punctate and not constricted pos- 
teriorly ; mouth, clypeus and a central facial mark flavous ; clypeus con- 
vex and slightly depressed before its rounded apex. Antennae shorter 
than body, rufescent beneath with the scape apically subentire. ‘Thorax 
stout and almost narrower than head with a pronotal line, two radical 
callosities, a line below scutellum, another below radices and usually 
centre of pleurae, flavous; notauli wanting; mesosternal acetabulae 
bidentate ; metathorax short and rugose with five upper areae, of which 
the areola is distinct and transverse and the lateral incomplete. Scutellum 
flavous. Abdomen sessile and longer than thorax ; two basal segments 
rugose and broadly fasciated with, remainder with apical margin narrowly, 
flavous ; first segment with carinae extending beyond its centre; second 
obliquely impressed on either side. Legs slender; the anterior except 
their femora above, and hind tibiae broadly at their base, pale flavous ; 
tarsal claws not pectinate. Wings slightly clouded; stigma infuscate, 
basally pale ; areolet triangular; nervellus intercepted at its centre and 
antefurcal. Length, 7—8 mm. 
This is a handsome and stout deep black species with conspicuous 
stramineous markings and somewhat rough sculpture, not unlike Ac7o- 
fomus succinctus superficially, but altogether more robust. 
Gravenhorst took it at the end of September on Pinus sy/ves/ris and 
tells us that Klug bred it from larvae of Zenthredo pint and Nees from 
larvae of Preronus pini and P. rufus; Brischke bred it from the cocoons 
of the former, as well as from Lophyrus fruletorum ; Gaulle records it 
