72 BRITISH ICHNEUMONS. 



Table of Species. 



(2). I. Second flagellar joint elongate ; scutellum 



entirely white OSCILLATOR, Wesm. 



(i). 2. Second flagellar joint sub-quadrate ; scutellum 



partly white Wesmaeli, Thorns. 



1. oscillator, Wesm. 



Ichneumon palltpes, Gr. I. E. i. 233, excl. $ . Eupalamiis oscillator, Wesm. Nouv. 

 Mem. Ac. Brux. 1844, p. 14, c5 9 > excl. var. i ; cf. Thoms. Ann. Soc. Fr. 1886, p. 12 ; 

 O. E. xviii. 1898. /. oscillator, Holmgr. Ichn. Suec. i. 172, excl. varr. ; Berth. Ann. 

 Soc. Fr. 1S95, p. 282, i ? , excl. var. 



Head black ; cheeks and temples somewhat inflated ; ? palpi apically 

 pale, frontal orbits whitish, external partly red ; $ also with palpi, man- 

 dibles, labrum, clypeus, face and rarely a mark at the genal orbits white. 

 Antennae compressed centrally and strongly attenuate ; second flagellar 

 joint much longer than broad ; white-banded in $ , scape whitish or ferru- 

 gineous in $ beneath. Thorax black, shining ; pleurae partly aciculate ; 

 callosity at radix sometimes whitish ; metathorax slightly bidentate, with 

 three upper areae only, of which the areola is longer than broad, sub- 

 hexagonal. Scutellum almost glabrous, entirely white. Abdomen shining 

 black, sometimes bluish towards the apex ; post-petiole sub-arcuate, central 

 area very broad, glabrous or with isolated deep punctures, in $ sometimes 

 aciculate-rugose, the lateral distinctly punctate ; gastrocaeli normal, rugose, 

 but shallow, intervening space evenly punctate ; terebra stout. Legs 

 normal, black ; front tarsi dilated, reddish, in $ white, their femora laterally 

 white ; all the tibiae broadly white-banded ; $ coxae and trochanters often 

 white-marked. Wings somewhat infuscate, stigma ferrugineous ; tegulae 

 often anteriorly white-marked. Length, 15-18 mm. 



The dorsal structure of the post-petiole of $ appears variable ; the 

 reddish external orbits are noteworthy, and the simply punctate second 

 segment will distinguish it from the species of Coelichneiimon with white 

 tibiae. 



This species may be easily distinguished from the others of the genus 

 occurring on the Continent by its entirely white scutellum ; E. Treniepohlii^ 

 Wesm., is considered to be distinct. 



Bignell has taken it at Bickleigh and Ivybridge, near Plymouth, in 

 August ; and it has been bred from Trichiura crataegi. It is said to be 

 found among young trees and shrubs ; its range extends throughout 

 Europe. 



2. Wesmaeli, Thoms. 



Eupalaiinis oscillator, var. i, Wesm. Nouv. M6m. Ac. Brux. 1844, p. 14. Ichneumon 

 oscillator, var. 2, Holmgr. Ichn. Suec. i. 172. Eupalamus IVesmaeli, Thoms. Ann. Soc. 

 Fr. 1886, p. 12 ; Berth, lib. cit. 1895, P- 283 ; Thoms. O. E. xviii. 1S98, ? . 



A large black species with clouded wings ; the apical half only of the 

 scutellum, the whole of or lateral dots upon the post-scutellum, with broad 

 tibial and flagellar bands, white. Length, 16 mm. 



In size and structure this $ is very similar to E. oscillatcr, of which 

 it was for so long considered a constant variety ; but the colour of the 

 scutellum and post-scutellum, the much more strongly dilated intermediate 



