BRITISH ICHNEUMONS. 233 



white-margined ; post-petiole bicarinate, glabrous ; gastrocaeli large, some- 

 what superficial and slightly oblique ; ultimate ventral segment not hiding 

 the shortly exserted terebra. Legs red ; coxae, trochanters, hind tarsi and 

 apices of their tibiae, black ; front tibiae laterally flavous ; tarsi slender, of 

 ? sub-spinulose. Stigma and nervures black ; areolet pentagonal, more 

 or less broad above ; nervellus vertical. Length, 6-8 mm. 



This species occurs in central and northern Europe, and is probably 

 common in Britain, where Bridgman is said to have bred it from Hypono- 

 meuta padella ; Essex ; Col. -Yerbury took it, at Caragh Lake, in S. W. 

 Ireland, about the middle of August ; and I have found it, at Ipswich, by 

 sweeping nettles, in Bentley Woods, at the end of May. 



16. volubilis, Grav. 



Cryptus vohihilis, Gr. I. E. ii. 507, i. Platylabus volubilis, Bridg. -Fitch. Entom. 

 1881, p. 208 ; Berth. Ann. Soc. Fr. 1896, p. 330, <5 . 



Head generally with the internal, and a trace at the external, orbits 

 narrowly white. Antennae centrally white-marked. Thorax black, with 

 white callosity beneath the radix ; spiracles circular. Scutellum white. 

 Abdomen sub-fusiform, red ; petiole and segments six, seven, and some- 

 times the margins of the fourth and fifth, black ; sixth and seventh gener- 

 ally white-margined ; post-petiole gradually dilated ; gastrocaeli distinct. 

 Legs slender, elongate, red ; coxae, trochanters, anterior legs laterally, 

 and hind ones at the apex, black. Wings sub -hyaline ; stigma and 

 tegulae piceous, latter sometimes white-dotted ; areolet sub -triangular. 

 Length, 9 mm. 



The legs appear to vary somewhat in colour. This species has never 

 been adequately described, and the female is still unknown. 



Gravenhorst records its occurrence on umbelliferae and sallows, in 

 Germany, in August. It was introduced as British, by Desvignes, in 1856, 

 and transposed to the present genus, by Marshall, in 1870. I know of no 

 distinctly indigenous records, however, and it has not been bred. 



17. pactor, Wesm. 



Platylabus pactor, Wesm. Nouv. M(5m. Ac. Brux. 1844, p. 164; Bui. Ac. Brux. 1848, 

 p. 313 ; lib. cit. 1S49, P- 42 ; HI'- cit. 1S55, p. 413 ; Hohngr. John. Suec. ii. 331 ; Thorns. 

 Ann. Soc. Fr. 18S8, p. 126 ; Berth, lib. cit. 1896, p. 330 ; Thorns. O. E. xix. 21 12, i ? . 



Head triangular anteriorly, narrowed behind the eyes ; vertex short ; 

 clypeus apically depressed and laterally rounded ; frons coriaceous, scrobes 

 small and lunate ; frontal orbits and vertical dots white ; c^ with face also 

 white. Antennae somewhat slender, black ; of 9 centrally sub-dilated 

 and white-banded ; of $ ferrugineous beneath. Thorax black, with pro- 

 notum and lines before and beneath radix white ; notauli distinct, short ; 

 areola transverse, arcuate ; costulae entire ; apophyses wanting ; spiracles 

 small, sub-circular. Scutellum and often post-scutellum white ; sides of 

 former shortly carinate at the base only. Abdomen black, with first four 

 or five segments red ; fifth or sixth to seventh, of which the apical two are 

 retracted, white-margined ; post-petiole somewhat narrow, glabrous, apical 



