Chorinaeus | BRITISH ICHNEUMONS. 19 

This species is the largest of the genus and differs from all the pre- 
ceding in its buccate cheeks, longer frontal flavous markings, the dis- 
tinctly longer antennae which are infuscate with the under side 
ferrugineous, and in the somewhat elongate calcaria. 
It has hitherto been overlooked and not recorded from Britain, but it 
is by no means uncommon with us. Thomson found it in southern 
Sweden and Gaulle records it from France. Ashby near Doncaster, early 
in June, 1900 (Cassal); Treswell Wood, Notts, early in June, 1900 
(Thornley) ; Cornworthy in Devon (Marshall); Wyre Forest on 16th 
April, 1895 (Martineau) ; Shere in Surrey (Capron); Guildford in August, 
1900 (Butler) ; Felden in the middle of June, 1901 (Piffard) ; Ewhurst in 
Sussex, early in September, 1898 (Esam); Finborough Park, Suffolk, on 
Angelica flowers at the end of August (Tuck). I have found it in the 
Bentley Woods in the middle of June and in the marshes at Henstead in 
the same county at the end of August, 1898. 
5. tricarinatus, Holmgr. 
Chorinaeus tricarinatus, Holgr. Sv. Ak. Handl. 1855, p. 321 ; Ofv. 1873, p. 77, 
pl. ii, fig. 12; Brisch. Schr. Ges. K6én. 1871, p. 101; Schr. Nat. Ges. Danz. 1878, 
p. 108; Voll. Pinac. pl. xxxviii, fig. 2; Thoms. Deut. Ent. Zeit. 1887, p. 202,¢ ¢. 
A black species with the second segment tricarinate, the legs partly 
red and the face dull flavous. Head black with the face somewhat dull 
and closely punctate, with the flavescence not extending above the 
scrobes; eyes internally hardly emarginate. Antennae ferrugineous, of 
? hardly and of ¢ but slightly longer than half the body. Thorax black ; 
prothorax with no impression next the dorsal suture; metanotal costulae 
stout or wanting; dentiparal areae apically produced. Abdomen nitidulous 
with the three carinae of the second segment elongate, and of the third 
short. Legs red or infuscate; intermediate calcaria strongly unequal in 
length; femora somewhat stout. Length, 5—6 mm. 
‘The tricarinate second segment renders this species abundantly dis- 
tinct, though two others with similar modifications have been described 
on the Continent. 
It is recorded from Lapland (Holmgren), Sweden as bred from Hyfono- 
meuta padella (Thomson) and in Austria from the same host (Giraud); in 
France it is also bred from H. malinella and H. 20-punctata (Gaulle). It 
was first noticed as British by Dr. Edward Capron and introduced 
(E.M.M. 1888, p. 217) on the strength of several examples of both sexes, 
taken at Shere in Surrey during the previous year; though single examples 
existed in both Stephens’ and Desvignes’ collection. These are now in my 
collection, together with a female captured at Felden in Herts (Piffard) and 
both sexes bred with Z7iclistus spiracularts, Thoms. and Microgaster tibialts, 
Nees, on “ May zoth to June 4th, 1898, from larvae of Depressaria scopart- 
ella, Hein., received from Colchester in July, 1897” (Bankes). I have 
invariably found it in very marshy places: on Angelica flowers at Hark- 
stead early in September, by sweeping in Tuddenham Fen at the end of 
August, and at Sutton Bridge in Lincs. in the middle of the same month 
on reeds. 
C2 
