44 BRITISH ICHNEUMONS. [Thersilochus 



One of the commonest species in northern and central Pairope during 

 August. Bred, according to Fitch (Entom. 1880, p. 257), from galls of 

 CjJiips Kollari. It must be rare with us for, beyond several females and 

 a male unnamed in Capron's Surrey collection, I have seen only a couple 

 of males, which 1 took on sallow in Wicken Fen in Cambs on loth June, 

 1902, and on birch bushes in Bentley Woods near Ipswich a week later. 



2. boops, Grav. 



Porizon hoops, Gr. I.E. iii. 776; Ratz. Ichn. d. Forst. iii. 91; Holmgr. Sv. Ak. 

 Handl. 1854, p. 23, ^ ?. Thersilochus boops, Holmgr. lib. cit. 1858, p. 145; 

 Thorns. O.E. xiii. 1389, <J . AUophrys hoops, Szepl. Ann. Mus. Nat. Hung. 1905, 

 p. 529, cf . 



Head somewhat shining, little constricted posteriorly, with eyes of 

 normal size and somewhat remote from ocelli; face short and transverse; 

 clypeus distinctly discreted, somewhat smooth and shining, apically 

 broadly rounded ; palpi and mandibles piceous or rufescent. Antennae 

 subincrassate towards their apices, with fourteen or fifteen flagellar joints 

 of which the third is a little longer than broad. Thorax subnitidulous 

 and convex, little longer than high ; basal area narrow and not very dis- 

 tinct. Abdomen black, oval, rather stout and centrally broad ; basal 

 segment slightly curved, little longer than hind trochanters ; second 

 short, transverse and sometimes badious; remainder not distinctly separ- 

 ated; terebra about a third the abdominal length. Legs testaceous with 

 coxae and trochanters nigrescent. Wings lacteous-hyaline with the large 

 stigma infuscate and tegulae dull ferrugineous ; branch of radial cell 

 short and recurrent emitted beyond the subelongate areolar. 



The J differs somewhat considerably : Head large and distinctly 

 constricted posteriorly, with the eyes very large and granulate ; ocelli 

 small and subcontiguous with the eyes; face strongly explanate apically, 

 temples pubescent and the shining clypeus apically slightly elevated. 

 Antennae slender and shorter than 9 , usually with thirteen or fourteen 

 distinct flagellar joints. Abdomen laterally strongly compressed, with 

 basal segment sublinear. Legs with the hind femora and usually also 

 base of the anterior infuscate or nigrescent. Wings with radius incrassate 

 at its junction with areolar nervure. Length, 3-4 mm. 



The 9 is very similar to Thersilochus saltator, though stouter and with 

 fewer flagellar joints; the unusually large and granulate eyes of the $ 

 resemble those oi Diaparsiis gilvipcs, though the species diff'er in all other 

 particulars. 



Gravenhorst knew three specimens, a male taken in a Gottingen garden 

 towards the end of May, another reared by Nees from a larva of the 

 heteromerous beetle, Hallonmiiis (Carida) affitiis, "in Boleto fomentario 

 habitante," during June, and a female among Aphides on foxglove during 

 May. Holmgren found it on sallow blossom at the beginning of INlay in 

 Sweden ; and Schm. finds it there very early in the year in Thuringia. 

 In Belgium it occurs in July and August, and the species may be expected 

 to occur during the same months with us, though there are no records 

 since Desvignes instanced it as represented in the British Museum in 

 1856. 



