Grypocentrus | BRITISH ICHNEUMONS. 315 

coxae black; hind ones black with apices of their trochanters, base of 
their tibiae and of their tarsi red; all the tarsal claw-joints black. 
Wings with radix stramineous, stigma piceous and areolet wanting. 
Length, 3 mm. 
This insect was bred in Prussia by Brischke “ aus Fenusa-Larven in 
Eichenblattern.” In Britain it has been captured by Bridgman (Trans. 
Norf. Soc. 1894, p. 627) at both Earlham and Brundall in Norfolk. 
ADELOGNATHUS, Holmgren. 
Holmgr. Sv. Ak. Handl. 1855, p. 196. 
Head subbuccate with vertex centrally emarginate, transverse, but tem- 
ples as broad as eyes; clypeus distinctly discreted, convex and apically 
truncate ; labrum exserted ; mandibular teeth of subequal length; cheeks 
short and subbuccate. Antennae shorter than body with about twelve 
flagellar joints, of which the first is always longer than the second, and 
the apical are incrassate-fusiform; pedicellus short ; scape not cylindrical. 
Thorax short and coarctate, with usually short notauli; mesosternum with 
no lateral sulci; metathorax declived nearly from its base, rarely with any 
entire areae, areola and costulae wanting. Abdomen not compressed, 
somewhat broad and usually ovate; basal segment deplanate, gradually 
constricted basally, margined, with postcentral spiracles; second with 
oblique thyridii; terebra straight and usually a little exserted. Legs not 
slender; hind tibiae stout and basally constricted; calcaria very short. 
Wings subample with areolet wanting or subpentagonal; stigma large; 
radial cell short; discoidal cell apically acute below; nervellus oblique, 
subantefurcal and intercepted. 
This genus was differentiated from Grypocentrus by Holmgren by its 
elongately exserted labrum, and placed by him in the Tryphoninae ; and, 
whatever their true position, these two genera appear too naturally allied 
to be very broadly dissociated. Thomson dealt of the present genus in 
1883 as an aberrant group of the Tryphoninae, merely remarking upon its 
connection with Plectiscus; but five years later he divided his group 
Plectiscina into the Adelognathides and Plectiscides, and this group has 
more recently been erected into a Subfamily of equal dignity with the 
Tryphoninae and Ophioninae by Szépligeti, who is not (I am glad to see) 
followed by Schmiedeknecht. That Adelognathus is structurally closely 
alied to Plectiscus there is no room for doubt; that the former belongs to 
the Tryphoninae, both on account of the deplanate abdomen with its 
hardly exserted terebra and its Tenthredinid host, appears certain; the 
latter has scarcely ever been bred, but the elongately petiolate abdomen 
with its strongly exserted terebra and often compressed @ structure is 
distinctly Ophionid. For the relation of Adelognathus to the Cryptinae, 
from which the lack of any mesosternal sulci distinguishes them, cf Ichn. 
Brit. il. 102. 
Table of Species. 
(6). 1. Petiole broad; third segment not at 
all rufescent. 
(5). 2. Antennae longer than half body ; 
anus entirely testaceous. 
(4). 3. Prothorax and frontal orbits Paste! 
stramineous : : .. I. PALLIDIPES, Grav. 
