Perilissus | BRITISH ICHNEUMONS. ; 259 

centre, with inconspicuous spiracles and very slightly explanate post- 
petiole; anus of 9 subcompressed. Legs slender, rufescent-testaceous, 
with hind coxae entirely or basally nigrescent and hind femora some- 
times concolorous. Wings subhyaline, stigma pale infuscate-testaceous, 
areolet obliquely subquadrate or minute and irregularly petiolate, nervellus 
intercepted nearly at its centre. Length, 5—6 mm. 
This is the description of Holmgren’s form but the colouration is 
extremely variable, which fact has led to its incorrect mingling with P. 
luteolator and P. erythrocephalus, since the head in the typical form is red 
with only the eyes and ocellar region black, the prothorax and entire 
legs concolorous, often with only the first segment of the red abdomen 
basally or entirely black; occasionally the mesonotal vittae are broadly 
red. The quadrate head, which is posteriorly as broad though no broader 
than the eyes, elongate basal metanotal area, strong costulae, the position 
of the nervellus and always distinct notauli, will serve to distinguish this 
conspicuously slender species. 
I have no hesitation in considering the synonymy here adopted correct. 
Not a rare species with us, but apparently confined to the month of 
June. Very common in Norfolk (Bridgman), Bickleigh in Devon early 
in September (Bignell); I have found the type in Mus. Brit., which 
Stephens took at Coombe Wood [“Cb.’’], along with others at Darenth 
wood, in June; Desvignes had several, called by him erythrocephalus ; 
and Marshall mixed a female, from Cornworthy in Devon, with vernalis. 
It has been sent me from Greenings in Surrey, 1871 (W. Saunders), Fel- 
den in Herts (Piffard) and Tostock in Suffolk (Tuck), where I have swept 
several from low herbage at Brandon, Barton Millsand Tuddenham, from 
gth to 12th June only. 
6. orbitalis, Grav. 
Tryphon orbitalis, Gr. I. E. ii. 254, ¢. Perilissus bucculentus, Holmgr. Sv. 
Ak. Handl. 1855, p. 123, ¢ ¢; Brisch. Schr. Nat. Ges. Danz. 1878, p. 72 (nec 
Voll. Pinac.). P. (Ecclinops) orbitalis, Thoms. O. E. ix. 918, 3 ¢. 
Closely punctulate and a little shining, black ; a small and stout species, 
with pale orbits and centre of abdomen. Head broader than thorax, sub- 
cubical, tumidous behind eyes; mouth, face, cheeks and usually the 
external orbits broadly flavidous or testaceous. Antennae slender, 
filiform and longer than body; testaceous below. ‘Thorax closely 
punctulate, with apical notauli; mesopleurae alutaceous, not punctate ; 
metathorax dull with areola elongate and subparallel-sided, costulae 
wanting and petiolar area basally distinct. Scutellum black and sub- 
convex. Abdomen pale red with first segment except apically, and anus 
from apex of fourth or fifth, black ; basal segment somewhat dull, hardly 
sulcate above the central and subprominent spiracles ; second transverse ; 
terebra and 6 valvulae a little exserted. Legs slender and testaceous 
with all coxae basally or hind ones entirely, and hind femora usually 
more or less, nigrescent; tarsi almost pectinate. Wings with radix and 
tegulae stramineous, stigma piceous or infuscate ; areolet large, irregularly 
R2 
