192 BRITISH ICHNEUMONS. [Exyston 
cally depressed. Abdomen oblong-fusiform, apically subacuminate ; 
basal segment narrow with the postpetiole twice longer than broad, 
apically scarcely explanate and carinate almost to its apex ; second seg- 
ment narrow and basally scabriculous with distinct thyridu. 
Black with the face anteriorly, and apex of scutellum usually, flavous ; 
abdomen, excluding basal segment and sometimes the basal half of the 
following, fulvous with anus paler. Anterior legs testaceous with tro- 
chanters paler; hind ones rufescent with apices of the femora and tibiae, 
a band before base of latter and often the extreme base of the former 
black. Length, 7—9 mm. 
This is not a rare species in Britain, though I have not taken it since 
1900, when Mr. W. H. Tuck and I found it in Suffolk during June and 
July by sweeping long grass both in dry and wet places at Tostock, Farn- 
ham and Aldeburgh. It is widely distributed with us and occurs on the 
Continent, where Gaulle records it as preying upon a species of Lmphy- 
tus, as late as October. ‘Taken rarely in Darenth Wood at the end of 
June (Stephens) ; not uncommon in Norfolk (Bridgman); Bickleigh and 
Bolt Head, Devon, in June (Bignell); several at Tarn Lodge, ten miles 
from Carlisle, early in July, 1900 (Routledge) ; Hastings (Vict. Hist.) ; 
Shere (Capron); Devon (Edmonds) ; Wyre Forest, middle of June, 1903 
(Martineau). 
2. brevipetiolatum, Thoms. 
Tryphon triangulatorius, var. 1, Gr. I. E. ii. 205, ¢. Exenterus triangula- 
torius, Holmgr. Sv. Ak. Handl. 1855, p. 235, ¢ ?. Exyston brevipetiolaius, 
Thoms. O. E. ix. 883, ¢ ?. 
A black species with the face white-marked and the abdomen except 
basally, with the anterior legs, rufescent. Genal costa apically sinuate 
and dilated ; postpetiolar carinae nearly wanting, basal segment short ; 
