Lathrolestus | BRITISH ICHNEUMONS. 277 

gren’s single species of Perilissus and Grypocentrus, which possessed 
pectinated claws, and appears divisible from the latter solely by its petio- 
late basal segment. 
Table of Species. 
(6). 1. Petiolar area entire and not extend- 
ing beyond centre of metathorax. 
(5). 2. Vertex immarginate ; anus entirely 
black. 
(4). 3. Metanotal areae wanting; head 
flavous, only discally black .. I. MACROPYGUS, Holmgr. 
(3). 4. Metanotal areae entire ; head black, 
orbits narrowly pale aD .. 2, BIPUNCTATUS, Bridg. 
(2). 5. Vertex centrally margined ; anus en- 
tirely testaceous_ .. bd .. 3. MARGINATUS, Zhoms. 
(1). 6. Petiolar area basally wanting and ex- 
tending beyond centre .. .. 4. UNGULARIS, Zhoms. 
1. macropygus, Holmgr. 
Perilissus macropygus, Holmgr. Sv. Ak. Handl. 1855, p. 126; Brisch. Phys. 
Ges. Kénig. 1871, p.71, ¢; Schr. Nat. Ges. Danz. 1878, p. 73,3 ?. P. soleatus, 
Holmer. Sv. Ak. Handl. 1855, p.126, ¢. Lathrolestus macropygus, Thoms. 
OO} Wee OY EG Os 
6. Shining, very finely punctate and black with the mouth, clypeus, 
face, cheeks and apex of frons, flavous. Head a little constricted pos- 
teriorly, flavous with only the occiput to centre of frons black ; mandibular 
teeth unequal ; clypeus not deeply discreted. Antennae as long as body 
and infuscate, pale with the scape entirely flavous beneath. Thorax 
laterally flavous, with hamate lines before radices and often apical meso- 
notal vittae concolorous; sternum pale with a central black mark ; 
metanotal areae wanting. Scutellum flavous, more rarely entirely black. 
Abdomen black with a basal red fascia on third and fourth segments ; 
the following shining and laterally pale; basal segment not broad; 
venter flavous, ventral valvulae large, exserted and pale. Anterior legs, 
with hind coxae and trochanters, flavidous; hind ones testaceous with 
tarsi subinfuscate. Stigma infuscate, tegulae flavous; nervellus inter- 
cepted below centre. 
Q. Structure of g, but the head posteriorly broader ; hypopygium 
retracted from the slightly reflexed terebra. Black with only mouth, 
antennae basally beneath, tegulae, trochanters and apices of coxae, pale 
flavous ; legs flavidous with coxae basally black; hind tarsi, apices of 
their tibiae and of anterior tarsi, infuscate. Length, 5—6 mm. 
It occurs in France, Sweden and both sexes were bred together in 
Prussia from larvae of Fenusa betulae and Blennocampa tenella by Brischke ; 
Cameron adds also from 2B. melanocephala. ‘This handsome little insect 
has been taken by Mr. Champion at Aviemore,” says Bridgman (Trans. 
Ent. Soc. 1887, p. 373), adding that it “has since been taken by Dr. 
Capron in the neighbourhood of Shere”; I possess the latter specimens, 
three males, together with a single pair, found by Piffard at Felden in 
Herts; Stanley Edwards captured a female at Ivybridge in Devon during 
1891; and I swept another, with many eggs or larvae at its anus, on 18th 
June, 1901, in an osier carr by the River Lark at Barton Mills, Suffolk. 
