Xorides.] BRITISH ICHNEUMONS. 15 



normal, a little narrow ; areolet wanting ; nervellus intercepted far above 

 the centre. 



The shining body, less globose head with contracted face, much more 

 slender and not basally constricted tibiae will distinguish this genus from 

 Xylommus. Gravenhorst refers to its relationship with Rhyssa. 



Table of Species. 



(4). I. Postocular orbits not rugose ; scutel- 



lum black. 

 (3). 2. Flagellum pale-banded ; terebra half 



length of abdomen .. 1. albitarsus, 6^ray. 



(2). 3. Flagellum immaculate ; terebra as 



long as abdomen 2. NITENS, Grav. 



(i). 4. Postocular orbits rugose ; scutellum 



partly flavous 3. scutellaris, Desv. 



1. albitarsus, Grav. 



Xorides albitcirsus, Gr. I.E. iii, 849; Brisch. Schr. Ges. Nat. Danz.. 1880, p. 

 127, ? ; Holmgr. Sv. Ak. Handl. 1860, n. 10, p. 66 <? ; Tasch. Zeits. Nat. Ges. 

 1863, p. 301.<? 9 . 



An alutaceously punctate and profusely white-marked species. Head 

 not rugulose behind the eyes ; palpi, S face and fontal orbits, 9 facial 

 orbits narrowly, white. Antennae longer than half the body, filiform with 

 the scape and the four basal flagellar joints stramineous beneath, though 

 becoming darker apically ; the tenth to fourteenth beneath, and eleventh 

 to thirteenth entirely, dull white in both sexes. Thorax cylindrical ; S 

 with the pronotum and callosities beneath the radix white. Abdomen 

 longer than the head and thorax and as broad as the latter, with the fwe 

 basal segments gradually becoming broader and shorter ; the first thrice 

 longer than broad, finely punctate and subcanaliculate ; second to fifth 

 obsoletely punctate, remainder nitidulous ; fourth to sixth with the apical 

 margin narrowly whitish, and the sixth ventral subproduced ; S also with 

 the three basal incisures broadly white ; terebra hardly longer than half 

 the abdomen, black with spicula red. Legs with the front trochanters, 

 femora and anterior tibiae mainly stramineous ; intermediate femora 

 apically concolorous ; apex of the hind trochanters and their tibiae infus- 

 cate, the latter dull white before the base and their tarsi infuscate with 

 joints two to four and apex of the basal white. Wings of 9 somewhat 

 clouded ; stigma of S testaceous, of 9 black ; radix and tegulae pale 

 stramineous or white. Length, 10-13 mm. 



This species is of the size and outline of A'', fii/efis, but the basal segment 

 is a little longer and it is rendered ver)^ distinct by the white markings. 



No one appears to have noticed this species in Britain since its intro- 

 duction by Desvignes, in 1856, on the strength of unlocaliscd specimens 

 in the National Collection. It is less widely distributed on the Conti- 

 nent than X. fu'/e/is ; and Tosquinet tells us Dr. Fromont has bred it from 

 the Longicorn, Prionus coriarius, in Belgium. 



2. nitens, Gvav. 



Xorides nitens. Gr. I.R. iii, 847 ; Latr. Cuv. R.A. ed. Masson, pi. ex. fig. 7 ; 

 Tasch. Zeits. Ges. Nat. KS63, p. 302 ; Tlioms. O.K. viii, 774, S ? ; Holmgr. Sv. 

 Ak. Handl. 1860, n. 10. p. 65, ? . 



