258 BRITISH ICHNEUMONS. [ Perilissus 

4. pallidus, Grav. 
Mesoleptus pallidus, Gr. 1.E. ii. 30, ¢ (nec Ste.). Perilissus pallidus, Holmer. 
Sv. Ak. Handl. 1855, p. 124, ¢ ¢; Voll. Pinac. pl. xxxiii, fig.5,¢. P.(Ecclinops) 
pallidus, Thoms. O. E. ix. 914. 
An entirely testaceous species with only the eyes, ocelli, mandibular 
apices and a small dot behind the front tegulae, black. Metanotal areola 
fine, entire and basally subexplanate, basal area elongate and sublinear, 
costulae distinct but fine, petiolar area small, strong and semilunate; 
basal segment laterally evenly a little explanate throughout from the sub- 
constricted centre of the petiole; areolet petiolate and strongly oblique, 
emitting the half pellucid second recurrent nervure from its extreme 
apex; basal nervure strongly curved, and below but slightly postfurcal ; 
nervellus a little postfurcal, intercepted at its centre. Length, 6—7 mm. 
Instantly known in the present genus by its entirely pale colouration 
which, however, so closely resembles that of such species as Prionopoda 
stictica, Mesoleptus testaceus, etc., that the above details appear necessary. 
This species probably occurs with some frequency throughout northern 
Europe; and Brischke says (Schr. Phys. Ges. Konig. 1871, p. 70) that he 
bred it from TZenthredo repanda, though the statement is not repeated, as 
is usual, in his later work (Schr. Nat. Ges. Danz. 1878, p. 73): the host is 
relegated to the genus Se/andria by Vollenhoven. With us it is certainly 
rare and all our older authors misunderstood it; it is not represented in 
Stephens’ nor Desvignes’ collections; but Marshall took four examples of 
Thomson’s var. a/bztarsis at Cheltenham, London and Cornworthy in 
Devon. The only typical 9 I have taken flew indoors to artificial light 
on the dinner table at Monk Soham House at 9 p.m. on 7th August, 1910. 
Records are very scanty; T. Wilson of Holgate records it (Yorkshire 
Naturalist, 1881, p. 153) as recently taken by him about York, and Bridg- 
man professes (Trans. Norfolk Nat. Soc. 1894, p. 625) to have found it at 
Brundall and Horning Ferry, in the Broads, during June and July. 
5. spilonotus, Steph. 
Mesoleptus spilonotus, Ste. Ill. M. vii. 227, 2. Perilissus subcinctus, Holmer. 
Sv. Ak. Handl. 1855, p. 123; Brisch. Schr. Phys. Ges. Kénig. 1871, p. 70; Schr. 
Nat. Ges. Danz. 1878, p.72; lib. cit. 1891, p.60; P. (Ecclinops) subcinctus, 
“Rhomsy Ole Baixo kane aeons 
Head a little buccate and hardly constricted behind eyes with whole 
clypeus, palpi, mandibles, and sometimes facial orbits above, testaceous ; 
frons deplanate, dull and closely punctate; face punctulate and sub- 
prominent; clypeus obsoletely discreted, apically subtruncate. Antennae 
very slender, as long as body, infuscate ferrugineous and basally paler 
below. ‘Thorax narrower than head, finely punctate with notauli apically 
distinct and pleurae aciculate; metanotum distinctly areated with areola 
elongate and not reaching base, lateral costulae entire and areae broader 
than long. Abdomen black with the apical half or only incisure of second 
segment and base of third more or less broadly rufescent, remainder 
black and pale-pilose; basal segment stout, narrow, sulcate beyond its 
