Xylonomus.] BRITISH ICHNEUMONS 21 



the abdomen, black with the spicula red. Legs normal, castaneous with 

 the coxae and trochanters, except sometimes the anterior latter beneath, 

 black; femora stout, usually more or less nigrescent towards the base; 

 tibiae sometimes infuscate but always paler before the base, the front ones 

 internally testaceous or dull white, hind ones of J sonietimes nearly 

 entirely nigrescent with their base alone red ; intermediate tibiae of 9 

 not tortuous, but internally towards the base deplanate. Wings more or 

 less clouded ; stigma black with nearly the basal half white ; radix and 

 tegulae infuscate, the former sometimes piceous ; nervellus intercepted 

 nearly in the centre. Length, 8-14. mm. 



Of the size and shape of A', piliconiis, but with the terebra shorter and 

 stigma paler. Confusion appears to have arisen in Britain between this 

 species and A', piliconiis, principally no doubt since Gravenhorst makes no 

 mention of antennal pilosity and Taschenberg distinctly says " Fiihler von 

 gewohnlicher Bildung " ; Holmgren, however, represents both sexes 

 "Antennae graciles, pubescentes " and Thomson "Antennis $ dense 

 pubescentibus." The species appear best differentiated by the conforma- 

 of the scutellum and of the 9 intermediate tibiae. 



It was first described by Fabricius from Saxony specimens in Hiibner's 

 collection. Gravenhorst found it in May, June and October at piled 

 timber near Breslau ; Ratzeburg records that Wissmann bred it in the 

 Hartz Mountains from Rhagium inda gator, and perhaps it was raised also 

 by Hartig (Jahresb. 1834, p. 433) from Bombyx monacha. This species 

 was introduced as British bv Marshall in 1870, and is the commonest of 

 its genus on the Continent ; but 1 know of no indigenous records and 

 have never met with it myself. 



4. pilicornis, Grav. 

 Xylonomus pilicornis, Gr. I. E. iii. 833; Curt. B. E. pi. cccliii ; Holmgr. Sv. 

 Ak. Handl. 1860, n. 10, p. G9 ; Tasch. Zeits. Ges. Nat. 1863. p. 300 ; Thorns. O. E. 

 via. 775, i ? ; Brisch. Schr. Nat. Ges. Danz. 1860, p. 127, <J . 



A somewhat shining and scabrously punctate, black species with the 

 abdomen centrally red and antennae setiferous. Head black with the moutli 

 testaceous. Antennae slender with the scape often pale beneath ; of <5 

 black and setaceous, a little shorter than the body and finely pubescent 

 throughout ; of 9 filiform and a little explanate at the apex, rather longer 

 than half the body and distinctly pilose apically, black with the ninth to 

 thirteenth flagellar joints white. Thorax cylindrical and immaculate ; 

 metathorax scabrous with usually obsolete apophyses, its areae complete ; 

 basal area elongate and cariniform ; areola pentagonal, not longer than 

 broad and emitting costulae before the centre. Scutellum apically 

 subreflexed at the sides. Abdomen subsessile, closely and coarsely punc- 

 tate, black with the second and third segments castaneous or red, gastro- 

 caeli of the former distinct, the basal segment rugulose and bicarinate ; 

 of (J elongate and parallel-sided, twice longer and a little narrower than 

 the thorax, basal segment elongate and apically castaneous, the second 

 subrvigose and usually obsoletely bicarinate ; of 9 elongate-fusiform and 

 as long and as broad as the thorax, basal segment coarctate behind the 

 spiracles and entirely, with the fourth and fifth sometimes basally and 

 laterally, red ; terebra a little longer than the abdomen, black with the 

 spicula badious. Legs slender and red with the hind ones elongate ; 

 tibiae not basally white, the anterior of 9 internally towards the base 

 obliquely impressed and tortuous ; coxae, troclianters, hind tibiae and 



