Mesoleptini’] BRITISH ICHNEUMONS. 215 
flavous, externally infuscate and apically black. Wings slightly clouded 
with the anterior margin very strongly infumate; stigma, radix and 
tegulae infuscate, rarely with the stigma red and radix ferrugineous ; 
areolet irregular and subpetiolate. Length, ro mm. 
It occurs throughout northern and central Europe, but with us is quite 
certainly rare. Bawsey Heath, Lynn by Atmore in Norfolk (Bridgman) ; 
Essex (Vict. Hist.). I have seen a specimen captured at Woking on 
24th June, 1903, by Rev. F. D. Morice; and possess others taken at 
Guestling in Sussex in 1880 by Rev. E. N. Bloomfield and Lynton, 
Devon, in 1890, by Edwards. 
SUB-TRIBE 
MESOLEPTINI. 
Among the present Subfamily of Tryphoninae, this sub-tribe is at once 
recognised by the possession of distinct calcaria and the strongly petiolate 
abdomen; but so closely do both sexes resemble certain Ichneumoninae 
in the latter feature and their smooth bodies that the older authors not 
only sometimes mixed them, but Gravenhorst actually placed Mesoleptus 
(with Sphinctus) next to them, as being on account of the distinct petiole 
most closely allied. Several species of Acrotomus, among the Cteniscini, 
are only to be separated by their lack of hind calcaria. For the sake of 
convenience | have endeavoured to place our species in as few genera as 
is consistent with natural grouping, and find it necessary to add but one 
to those contained in our last catalogue. 
Table of Genera. 
(10). 1. Vertex of head very distinctly trans- 
verse; petiolar spiracles central. 
(3). 2. Basal segment straight, linear and 
not apically dilated is MESOLEPTUS, Grav. 
3. Basal segment curved and distinctly 
dilated apically. 
(5). 4. Petiole stout; nervellus elongately 
postfurcal .. a: ae, .. PERISPUDUS, Zhoms. 
5. Petiole slender; nervellus opposite or 
not elongately postfurcal. 
6. Lower mandibular tooth the Hie 
terebra reflexed .. CATOGLYPTUS, Holmgr. 
(6). 7. Mandibular teeth of equal ‘length ; 
terebra not reflexed. 
(9). 8. Clypeus not truncate; second seg- 
ment not impressed 4s .. EurRyproctus, Holmgr. 
(8). g. Clypeus apically truncate ; second 
segment basally impressed NotopyGus, Holmgr. 
(1). 10. Vertex of head buccate and subquad- 
rate ; petiolar spiracles before 
centre. 
(12). 11. Mandibular teeth of unequal apse 
areolet entire PERILISSUS, Hlolmgr. 
(11). 12. Mandibular teeth of ‘equal Tength 5 
areolet wanting .. ' . Ectytus, Holmgr. 
