148 BRITISH ICHNEUMONS. [Omorga 



collection appear to belong to this species, though they differ from the 

 last in little but the basally infuscate hind femora and seem hardly more 

 than a colour form of it. They were taken by Piffard at Felden in Herts, 

 Capron about Shere in Surrey and the only male, whose anterior coxae 

 and trochanters are black, was sucking the stylopods of Ajigeliai syh'estris 

 on 26th August, 1899, at Claydon bridge in Suffolk. 



4. difformis, Giiiel. 



Ichneumon diffortuis, Gmel. S.N. 1790,2720. Canipoplex difformis, Gr. I.E. 

 iii. 458; Ratz. Ichn. d. Forst. i. 92, ii 81, iii. 82; Holmgr. Sv. Ak. Handl. 1854, 

 p. 11, <f ? . Limneria diffor))iis, Holmgr. lib. cit. 1858, p. 58; Bridg. -Fitch, 

 Entom. 1885, p. 106, ? ; Brisch. Schr. Nat. Ges. Danz. 1880, p. 149, i ? . Omorga 

 difformis, Thorns. O.E. xi. 1127, i ?. 



Black with the femora and tibiae red ; 9 with the sixth and seventh 

 segments apically emarginate, $ with the anal valvulae mucronate. Body 

 subnitidulous and finely grey-pubescent. Head hardly constricted pos- 

 teriorly with cheeks subbuccate, palpi and centre of mandibles flavidous. 

 Scape not pale-marked beneath. Thorax densely and rugosely punctate, 

 with mesopleurae not very closely punctate; metathorax posteriorly longi- 

 tudinally subexcavate, with stout costae and the areola apically incom- 

 plete. Abdomen with only the ventral plica flavidous; postpetiole later- 

 ally rounded, second segment a third longer than apically broad, third 

 quadrate ; terebra as long as hind tarsi and a little longer than half 

 abdomen. Legs red with coxae and trochanters black, anterior trochan- 

 ters partly pale ; tarsi apically infuscate. Wings somewhat infumate, 

 with stigma piceous and tegulae whitish-flavous ; areolet irregularly 

 petiolate, emitting recurrent nervure beyond its centre ; nervellus dis- 

 tinctly geniculate. Length, 5-9 mm. 



The remarkable emarginate ? segments and mucronate ^ anal styls, 

 combined with the characters enumerated under O. Fau)nis, render this 

 species unmistakable. 



Sweden in July; Brischke bred it from a Tortrix pupa in Prussia; and 

 it is said to be one of the commonest Continental species. Ratzeburg 

 records his insect from Torfn'x Buoliaini (Jahresb. p. 268), in June from 

 T. ameriana pupae (Wiegm. Arch, ii, p. 40) and from Bombyx dispar 

 (Bouche, (lartenins. 154); later (ii. 81) from Nothris verhascella and (at 

 iii. 82) from Tortrix laevigana, Psyche sp. and Nociua saiellitia, but more 

 than one species must compose this medley; Gaulle considers it poly- 

 phagous on lepidoptera, as well as preying upon Lophyrus pini and L. 

 sivihis; and Tosquinet found it during June in Belgium. This was the 

 only species of "Campoplex" known to Westwood as British in 1840 

 (Introd. ii. Synop. 60). Bignell is said (Entom. 1881, p. 140) to have 

 raised it from lAmaspHis marghia/a, but he tells us in 1898 that the Devon 

 host from which it emerged on 8th May was unknown. Bridgman failed 

 to note this species in Norfolk, and it has but rarely occurred to me in 

 Suffolk on windows of INIonk Soham House, in marshes at Reydon and 

 on bushes towards the end of September at Depden, the highest point of 

 the county (420 feet). Tuck took a female in Finborough Park at the 

 end of August ; Capron had both sexes from Shere; and Clarke bred a 

 male from Penthina cynoshana on 7th |uly, 1907, at Crouch End near 

 London. Between 3rd and 8th of July, i()04, Bankes bred a pair from 

 Torlriccs at Corfe Castle in Dorset. 



