282 BRITISH ICHNEUMONS. [ Luceros 

of a cocoon of its own manufacture, cylindrical, of equal breadth at both 
extremities, somewhat shining, very dark brown and strongly resembling 
those of the Pimplid genus Zzssonofa, with no distinct girdle; it was in 
its cocoon about fourteen days. 
2. serricornis, Hal. 
f Euceros serricornis, Hal. Ann. Nat. Hist. 1839, p.117, ¢ ?. E. grandicornis, 
Holmgr. Sv. Ak. Handl. 1855, p.200, ¢. EE. egregius, Holmgr. lib. cit. p. 201, 
& ¢, excl. var.; Voll. Pinac. pl. xxxiti, fig. 8; cf. Kriech: Ent. Nachrigisse: 
p. 198. Bassus peronatus, Marsh. E.M.M. xii, p.194; Morl. Trans. Ent. Soc. 
1905, p. 4388, ¢. 
A shining, white-marked species, with the hind tarsi white-banded and 
only the metathorax laterally red. Head and thorax white-marked; ¢ 
face and orbits broadly white, with flagellar joints apically produced and 
the 9th—12th strongly explanate. Metanotal areola entire and triangular. 
Abdomen with four centrally interrupted pale bands. Legs pale with the 
hind coxae and femora red, their tarsi nigrescent and centrally white- 
banded. Length, 7—8 mm. 
Extremely like the preceding but with the areola entire, the hind tarsi 
centrally pale and the metapleurae nearly always broadly testaceous. No 
doubt can remain respecting the synonymy of Haliday’s species with that 
of Holmgren; that it has not hitherto been noted is entirely owing to the 
neglect with which the former’s Ichneumonidae have been treated on 
the Continent, and lack of students at home. Why Dalla Torre places 
£. serricornis in the Pimplid genus Acrodactylus I fail to understand. 
Both sexes were originally described from examples taken during June 
in Wicklow, Ireland. It is said by Holmgren to be very rare, early in 
September, in Sweden ; and Gaulle has recently recorded it from France. 
It was brought forward as English by Dr. Edward Capron (Entom. 1880, 
p- 87) on the strength of a single female, taken near Guildford in Surrey 
during the preceding year; he subsequently took a second and both 
are now in my collection. The only other example I have seen was swept 
by Mr. Ernest Elliott on 20th August, 1907, from herbage on the banks 
of the river Tay at Birnam in Perth. 
That Bassus peronatus does not belong to that genus, I was at once able 
to ascertain by its simply bidentate mandibles upon examining the type, 
labelled ‘“‘ Vematus nanus, Cam., bred July, 1874” by Cameron, from 
whom it was acquired by the British Museum in 1898; but its true 
position was much more difficult to come at. I have no doubt, however, 
that it belongs to the present genus, where the rufescent mesosternum, 
etc., renders it most closely allied to this species, of which I consider it 
a variety. Marshall says (oc. ce¢.) that it was bred from the larvae of 
Nematus cadderensis, found (/.c. p. 128) feeding on birch in Cadder Wil- 
derness. 
3. unifasciatus, Voll. 
Eucerus unifasciatus, Voll. Tijds. v. Ent. 1878, p. 159, ¢. 
Black, somewhat dull, with dense and very short griseous pubescence. 
Head with the palpi, facial orbits and a large dot at the outer orbits, 
flavous. Always two dots on the basal carinae of the scutellum, often its 
apex transversely, nearly always the apex of postscutellum and occasion- 
ally two short lines on front of mesonotum, flavous ; metanotum trans- 
