Xorides.] BRITISH ICHNEUMONS. 17 



slender, cun-ed and distinctly bifid before their apices. Wings with the 

 costa and sti^nna infuscate, J with the latter centrally paler ; radix and 

 teg^ulae of ^ pale, of 9 ferrugineous. Length, 12-18 mm. 



Holmgren's species agrees so exactly with that of Desvignes that no 

 doubt can exist as to the synonymy of these names. The extent of 

 orbital white in the female appears to be variable, as also is the flavescence 

 of the scutellum. 



Both sexes were described by Desvignes, in 1856, from specimens in 

 both the British Museum and his own collections ; it does not appear to 

 have been noticed in Britain since that time, though recorded from Sweden 

 and Prussia. 1 j)Ossess a single female, whose metathorax is described 

 above, taken recently by Mr. Albert Piffard, at Felden, near Boxmoor, in 

 Hertfordshire. 



XYLONOMUS, Gravenhorst. 

 Gr. I.E. iii, 819 (1829). 



Abdomen subsessile, deplanate and basally scabrous ; areolet wanting ; 

 legs and terebra normal. Head short, subtransverse or subglobose with 

 the face quadrate and not narrowed towards the mouth ; clypeus very 

 short, subcircular, basally discreted, often stronglv depressed and remote 

 from the orbiculate-oval and somewhat small eyes ; genal costa inflexed 

 towards the base of the peristomium ; mandibles small, straight, subcon- 

 ical and triangular, apically subentire ; palpi elongate, setaceous and 

 pubescent with the basal joint obconical and truncate, the second broader, 

 cultrifomi and internallv produced, the apical more slender and longer 

 than the penultimate. Antennae slender, usually white-banded and some- 

 times setiferous, stouter in $ ; scape and pedicellus of equal length and 

 subglobose, the latter exserted and a little the narrower ; annellus smooth 

 and subobsolete ; flagellar joints cylindrical, gradually decreasing in 

 length and apically hardly nodulose. Thorax cylindrical, much longer 

 than high ; notauli distinct and elongate ; epomiae and epicnemia distinct ; 

 metanotal areae and apophyses well defined ; spiracles linear or oblong. 

 Scutellum more or less convex, triangular and apically obtuse. Abdomen 

 subsessile, somewhat deplanate discally, finely punctate and rarely shining ; 

 of (^ elongate, sublinear or a little dilated towards the apex, narrower 

 and usually twice longer than the thorax ; of 9 shorter and as broad as 

 the thorax, oblong or oblong-ovate. Basal segment longer than broad, 

 scabriculous with usually distinct longitudinal carinae, parallel-sided or in 

 9 apically dilated, sometimes laterally impressed with the spiracles 

 slightly behind the centre ; eighth 9 segment exserted. Terebra 

 emitted before apex, not or only slightly longer than the abdomen. 

 Legs normal or subelongate ; anterior tibiae, especially in 9 > incrassate 

 and coarctately constricted at the base ; tarsal claws small and simple. 

 Wings somewhat narrow ; areolet entirely wanting ; lower wings with the 

 radial abscissa shorter than the recurrent nervure. 



This genus differs from both Xoridts and Odontomcrus in the rugulose 

 petiole and broader basal segment, from the former in its quadrate face 

 and the latter in the conformation of its hind femora ; its relationship with 

 Banchus and Andes is remarked by Gravenhorst. 



As its name implies, the species of this genus infest lignivorous larvae ; 

 none, however, appear of frequent occurrence with us or upon the 

 Continent. c 



