326 BRITISH ICHNEUMONS. \Acroricnus. 



Concerning the economy of this species, Marshall (Braconides d' 

 Europe, i. 294) says he found three parasites in a single nest of Eufnenes 

 coarcfahi, taken near iJournemoulh, and that they were all different — a 

 Linoceras, a Campoplex and a Braconid (Rhogas modestus, Reinh.). 



XYLOPHURUS, Fdrs/er. 



Frirst. Vcrh. pr. Rheinl. 186S, p. 169 ; Echtlii iis, Gr. I, E. iii. S61 (part) ; Macro- 

 oyptns. Thorns. O. E. v. (1873), 486. 



Head cubical, vertex broad, cheeks tumidous ; clypeus short, laterally 

 depressed and apically distinctly dentate in the centre ; mandibles basally 

 sub-gibbose. Antennae witli flagellum filiform and scape excised beyond 

 the centre. Epomiae distinct, notauli elongate ; petiolar area rarely 

 entire, spiracles oval. Scutellum somewhat convex. Abdomen elongate, 

 alutaceous ; basal segment apically curved, its dorsal carinae distinct and 

 extending beyond the spiracles, which are situated behind the centre, 

 and its lateral carinae also distinct ; eighth segment produced ; terebra 

 elongate. Tibiae nearly mutic, front ones of ? intumescent and basally 

 constricted ; fourth tarsal joint bilobed. Radial nervure sub-inflexed ; 

 areolet laterally convergent above ; nervellus intercepted below the centre, 

 the median nervure straight. 



In placing this genus among the Cryptini ^.ndi dismembering it from the 

 true Echthrus of Gravenhorst, I follow Thomson, who says of Macrocryphis 

 (O.E. 487) that the petiole is less distinctly bordered and the petiolar 

 spiracles are placed further behind the centre. It agrees with Cryptus in 

 its most salient features, but differs in the more cubical head with buccate 

 cheeks, centrally dentate clypeus, the length of the terebra and of the 

 female's eighth dorsal segment and strongly inflated front tibiae. The 

 same author considers (lib. cit. 776) that the restricted genus Echthrus 

 is probably also referable to the Cryptini, while retaining it among the 

 Pimplids, from all of which, however, it differs in its pentagonal areolet, 

 entire petiolar area and bilobed fourth tarsal joint. Of the British 

 species of Echthrus (sensu lato) Schmiedeknecht gives in his Opuscula 

 Ichneumonologica, p. 475, only lanciper under Xylophurus, retaining E, 

 re/uctator, Linn, (as does Marshall in 1872) and E. nubeculatus, Grav. 

 (cf. Trans. Ent. Soc. 1887, p. 379), presumably under Echthrus (sensu 

 stricto) among the Pimplids (cf. E.M.M. 1902, p. 174). For the meta- 

 morphoses of E. usurpator, cf. Xambeu, Naturaliste, 1895, p. 78 et 1899, 

 p. 128. One of Brischke's species, E. armatus, is said to prey upon 

 Leucania obsokta. 



I. lancifer, Grav. 



Echthrus laucifer, Gr. I. E. iii. 867 ; Tasch. Zeits. Ges. Nat. 1S65, p. 303, ? ; Brisch. 

 Schr. Nat. (Jes. Danz. 1880, p. 128, i . Macrocryptus laucifer, Thorns. O. E. v. 487, 

 ? , cf. xxi. 2354 ; lib. cit. 2377, 6 . Cryptus tumidus, Desv. Cat. 56, ? . 



Head immaculate, transverse, tumidous, parallel-sided, with eyes not 

 prominent and occiput convex. Antennae filiform, slender, shorter than 

 body, black ; of ? ferrugineous beneath, with their central joints white. 

 Thorax and scutellum black ; metathorax rugulose throughout, with two 

 transverse sinuate basal, but no apical, costae ; spiracles distinctly 



