Notopy gus | BRITISH ICHNEUMONS. 253 


terebra straight, emitted from circular orifice. Legs neither slender nor 
elongate, red with coxae and hind femora alone black ; hind tibiae some- 
what short and hardly infuscate apically ; anterior coxae and trochanters 
of ¢ flavous; 9 hind femora stout. Wings not broad, hyaline with 
stigma narrow and dull testaceous, radix and tegulae flavidous; areolet 
petiolate, with the outer nervure wanting below and continuous with the 
2nd recurrent, which is broadly fenestrate; basal nervure continuous ; 
nervellus opposite and intercepted hardly below centre. Length, 
g—10 mm. 
Very rare in Sweden, says Holmgren, and the male figured by Van 
Vollenhoven does not appear to be Dutch, though Tosquinet records it 
from Belgium and Gaulle from France. The only known British example 
of this genus was correctly named by Bridgman (Trans. Ent. Soc. 1882, 
p. 156), captured by Cameron at Kingussie in Inverness, and acquired 
from him by the British Museum in 1898; it is from it that I have drawn 
the above male description. 
PERILISSUS, Holmgren. 
Holmer. Sv. Ak. Handl. 1854, p. 61 ; 1855, p. 121. 
Head generally strongly buccate posteriorly, always with the sub- 
emarginate vertex very broad, subquadrate, occasionally subglobose, rarely 
a little transverse ; clypeus hardly convex and usually distinctly discreted 
basally ; mandibular teeth always of unequal length. Antennae setaceous 
and often longer than the body; scape subovate, basal flagellar joint 
always longer than the second. Thorax dull, metanotum with areola 
nearly always entire, petiolar area strong, costulae variable. Abdomen 
oblong-ovate or subfusiform, of @ apically a little compressed; basal 
segment either gradually narrowed to its base or a little curved before the 
spiracles with discal sulcus and carinae wanting or strongly obsolete ; 
spiracles somewhat antemedian and petiole not parallel-sided ; terebra 
straight. Legs slender, tarsal claws simple or hardly setose. Wings 
subample, stigma of normal size; areolet always distinct, usually sub- 
orbiculate, rarely sessile and triangular ; second recurrent half pellucid. 
It is decidedly more convenient to allow our eleven species to repre- 
sent a single genus than to divide them, as was done generically by 
Férster and subgenerically by Thomson, or even like Pfankuch to recog- 
nise only LZecl’nops and Polyoncus as distinct. The character of the 
posteriorly intumescent and often explanate head is sufficient to dis- 
tinguish all the species here placed from the allied genera, excepting only 
Eclytus, though the stouter and more thick-set Laphyroscopus are less 
homogeneous than the other groups on account of their rather more 
transverse vertex, shorter legs and petiole, and the often elevated 
metanotal carinae with subquadrate areola. Recent investigations have 
altered the great majority of the names hitherto employed in our 
catalogues, fortunately before they had become familiar to British 
students; and the number of our known species is doubled since 1872. 
Of the species enumerated in Marshall’s list, P. favopicfus is said to be a 
Mesoleius and Pfankuch could not find the type, though he tells us that 
P. modestus is a Pimplid and that P. dimitaris is the 2 of Gravenhorst’s P. 
naevius, of which the Q and var. are a AZesoletus; and I have no doubt 
respecting the synonymy of Stephens’ species, the type of which I have 
