264 BRITISH ICHNEUMONS. | Perilissus 

with notauli obsolete, mesopleurae broadly and rarely two mesonotal 
vittae fulvous ; metathorax pale beneath, discally fully carinate with basal 
area short, areola subquadrate, costulae strong and petiolar area entire. 
Scutellum subconvex and black, or red or flavous with its base darker; 
frenum concolorous. Abdomen pilose and somewhat short, flavous with 
first segment entirely and the following usually broadly on the disc black ; 
basal segment subdeplanate, punctulate, dull, centrally subsulcate with its 
postpetiole broad and apically thrice broader than the short and centrally 
subconstricted petiole, spiracles not prominent. Legs short and not 
slender, clear testaceous with only the hind tarsi and apices of their 
basally constricted tibiae infuscate. Wings hyaline with stigma piceous, 
radix and tegulae stramineous ; areolet and recurrent nervure as in the 
preceding species; radial cell short and broad; nervellus antefurcal and 
intercepted distinctly below centre. Length, 5—6 mm. 
A much smaller and stouter species than the preceding, at once known 
from them by the entirely flavous underside, metanotal structure, less 
cubical head and position of the nervellus. The discal colour of the 
abdomen is variable; usually only the sides are pale, sometimes the in- 
cisures are flavescent, and in the type form the third segment is entirely 
fulvous. 
It occurs on oak in Germany during May, rarely about midsummer in 
Sweden, as well as in Belgium, Holland, and France. It was first bred 
by Prof. Gorski from Al/antus adumbratus in 1848, according to Ratz. ; 
subsequently Brischke raised it from larvae of Se/andria annulipes and 
Schizocera geminata ; and Dalla Torre credits Rondani with also breeding 
it from Eriocampa limacina, probably in Italy. ‘Taken in June in the 
vicinity of London”’ (Stephens, whose collection contains none). P. Gor- 
skit was introduced as new to our fauna by Bridgman (Trans. Ent. Soc. 
1882, p. 256) on the strength of examples bred by Fletcher, probably at 
Worcester, from Phyllotoma vagans and taken by himself at Norwich in 
July. It was also found at Lynn by Atmore; Bishops Teignton in Devon 
by Marshall; and I have a full series from Shere in Capron’s collection, 
with one or two I took at Lyndhurst in the middle of July, 1909. 
12. pictilis, Holmgr. 
Perilissus pictilis, Holmgr. Sv. Ak. Handl. 1855, p.125; Brisch. Phys. Ges. 
K6nig. 1871, p.71; Schr. Nat. Ges. Danz. 1878, p.73,¢ ¢ ; ? Voll. Pinac. xxxiii, 
fig.6,¢. P.(Luphyroscopus) pictilis, Thoms. O. E. ix. 915. 
A little shining and finely punctate, with metanotal areola sulciform. 
Head with mouth, apical margin of clypeus, frontal and external orbits, 
and base of antennae flavidous. Thorax with mesonotal vittae nearly 
always, marks below wings and in ¢ the prothorax, flavous; metanotal 
areae distinct, with areola subsulciform. Abdomen black with all the 
segments apically, and the third sometimes entirely, testaceous or in 9 
rarely nearly entirely black; basal segment very finely punctulate, gradu- 
ally dilated towards apex, with no or obsolete sulcus. Legs testaceous, 
with at most hind coxae basally black. Wings with tegulae flavous; ner- 
vellus intercepted at its centre. Length, 4—5 mm. 
Very closely allied to P. /uteolator, from which Thomson differentiates 
it by a somewhat distinct stigma in the lower wings, its shorter calcaria 
and black mesosternum. 
Holmgren found it during September in Sweden; Brischke bred it in 
