Fezomachus.] BRITISH ICHNEUMONS. 203 



base to apex ; spiiacles more or less distinct ; post-jjetiole one-half longer 

 than wide ; second segment nearly as long as the width at its apex ; 

 remainder transverse ; third widest. Areolet imperfect ; transverse anal 

 nervure divided one-third from the bottom. 



Black ; apex of first segment, base and apex of second, and base of 

 third, reddish ; greater part of front legs, all the tibiae and tarsi, reddish ; 

 stigma fuscous. Length, 3'5--4 mm. 



This male is allied to Pezomachus instabilis, from which it materially 

 differs in the entire absence of an areola, and in the dense al)dominal 

 pubescence. It i)robably constitutes the unknown $ of P. Miilleri ; at 

 all events, it appears expedient to here treat it as such. Specimens in 

 Dr. Capron's collection from Surrey very closely resemble Hemiteles mono- 

 zoniiis. Gray. Four males from a collection belonging to Mr. Marshall.] 



The coloration of the $ legs is subject to considerable variation. 



This species is far less common than F. intermedins, with which it is 

 doubtless much mixed in collections, and of which it will very jjossibly 

 prove to be but a small form, though more elongate and with no trace of 

 a scutellum. 



In introducing this female into our fauna, Bridgman says (Trans. Ent. 

 Soc. 1881, p. 156) that it had been taken during 1880 at Weybridge, 

 Leatherhead and Rainham ; and he himself subsequently found it at 

 Mousehold, near Norwich ; Bignell has cai)tured a single specimen at 

 Bickleigh in Devon, early in September (Entom. 1882, p. 45). I have no 

 doubt that F. incertus is identical, differing slightly in the development of 

 the transverse metathoracic costa ; it is said (Trans. Ent. Soc. 1881, p. 156) 

 to be not uncommon in Britain and recorded from about Norwich ; several 

 were taken at Headley Lane in 1880 and beaten from whitethorn hedges 

 at Exeter early in September. I have only found it in the Bentley Woods, 

 near Ipswich, in March, April and October, usually, with F. intermedins 

 on Finns sylvestris, though occasionally by sweeping low plants at dusk. 



23. vagantiformis, Bridg. 

 Pezomacltus vagantifonnis, Bridg., Trans. Ent. Soc. Lond. 1SS6, p. 342, ?. 



Head somewhat narrow behind the eyes. Antennae with basal flagellar 

 joint scarcely longer than second and four times as long as wide ; fifth is 

 one-and-a-half times longer than wide. Thorax somewhat elongate, twice 

 as long as high ; the meta- longer and higher than the meso-notum, and 

 both rounded ; no trace of a scutellum ; transverse metathoracic costa 

 present. Abdomen rather narrow, sub-cylindrical, not wider than the 

 head ; pubescence dense and scarcely more scattered at the apex ; punc- 

 tuation unusually strong ; first segment rather narrow, about two-and-a- 

 half times as wide at the apex as at the base ; spiracles not very distinct, 

 from these to the apex the sides straight and gradually widened ; between 

 the spiracles about twice the width of the base ; remaining segments 

 transverse ; terebra rather longer than the first segment. 



Head black. Antennae brown, the apex darker ; second joint and base 

 of third reddish. Fro- and meso-thorax brownish red, metathorax reddish 

 brown, paler in the middle of the back. Abdomen black-brown ; first 

 segment and all margins of second red. Legs red ; apex of posterior 



