Exenterus BRITISH ICHNEUMONS. 209 
— bat ne —_—— 

(Marshall coll.). Specimens in my collection were found by Miss Chaw- 
ner in the New Forest, by Thornley at South Leverton in Notts in May 
1896, by Alfred Beaumont at Whitby in Yorks in the middle of August, 
1897, and several by Dr. Capron at Shere in Surrey; Dalglish took a 
female at Irvine Moor in Ayrshire on 30th June, 1900, 
8. basalis, Steph. 
Tryphon basalis, Ste. Ill. Mand. vii. 255, 9. Exenterus ustulatus, Holmgr. 
Sv. Ak. Handl. 1855, p. 2386, ¢ @. Cteniscus ustulatus, Thoms. O. E. ix. $91. 
A shining, punctulate, black species with broadly red abdomen. Head 
coarsely punctate and posteriorly subdilated; mouth and _ clypeus 
flavidous, the latter convex and slightly depressed before its apex. 
Antennae apically ferrugineous beneath. Thorax stout and black, pleurae 
very finely punctulate; metathorax somewhat short with five areae, of 
which the areola is subhexagonal. Scutellum black. Abdomen with 
segments two to five nearly entirely red; anal segments black, apically 
whitish ; basal segment subscabriculous, centrally sulcate, with carinae 
extending beyond its centre. Anterior legs red, with coxae and tro- 
chanters partly black; hind legs black, usually with their tibiae and tarsi 
infuscate-ferrugineous, and rarely femora red. ‘Tegulae flavidous; ner- 
vellus intercepted a little below its centre. Length, 7 mm. 
Thomson says it may be known by the entirely black flagellum, closely 
punctate frons and black ventral valvulae. It is very like 2. flaviladris, 
but a little stouter and of more decided red colouration. I have examined 
the three female specimens described by Stephens, which are now in the 
British Museum, with two males also from his collection; the synonymy 
is beyond question. Two more examples of this species were named 
Trvphon proditor, Grav., by Desvignes; this Gravenhorstian species was 
incorrectly placed in Zrromenus by Marshall in 1872 (its claws are not pec- 
tinate), since it is a true Z7vphon of the subgenus (Vegeles, FOrst., instantly 
known by two apical clypeal teeth; Stephens recorded it as British on 
two examples, still in his collection, which have no clypeal teeth and in 
no way agree with Pfankuch’s description of the type (Zeits. Hym.-Dip. 
1907, p. 147) 
The present species is hardly known outside Sweden, though probably 
far more widely distributed and certainly not very rare in Britain, where 
Bignell took it at Bickleigh in Devon on 4th September, and there is an 
old specimen on a bead-headed pin with no data in Marshall's collection, 
I have occasionally swept it in very boggy places at Chippenham in the 
Cambridgeshire Fens on 15th June and at Barnby in the Suffolk Broads 
on 18th May; Rev. F. W. Johnson has given me a male taken at Poyntz- 
pass, Co. Armagh, in 1908; and Elliott found it at Banchory in the 
Scots Highlands in September, 1910. ‘The type was found near London 
in June. 
9. flavilabris, Holmgr. 
Exenterus flavilabris, Holmgr. Sv. Ak. Handl. 1855, p. 237, ¢ ¢. 
A black, shining and punctulate species. Mouth and clypeus flavidous, 
the latter slightly impressed before its rounded apex ; frons convex, and 
face centrally subelevated and finely punctate, Basal flagellar joint a 
O 
