202 BRITISH ICHNEUMONS. [Pezomachus. 



petiole ; second segment red, with a faint fuscous stain across the middle ; 

 third red, with a brown irregular mark across the segment, nearly 

 obliterating the red ; stigma and nervures fuscous ; base of wings pale. 

 Length, 3-^-4^ mm. 



This $ appears to differ from H. rufipes (P. cautus, c? j in the longer 

 face, the more distinctly trilobed mesothorax, shorter first segment, and 

 wider post-petiole, which, in the latter species, is only one-third wider 

 than the petiole. 



The antennae of this species are distinctly incrassate towards their 

 apices. 



Forster described his P. formicarius from a specimen with the antennae 

 wanting and nietathorax mutilated. The variety Ratzeburgi appears to 

 differ in the closer puncturation of the head," deeper metathoracic impres- 

 sion, and the prominence of petiolar spiracles. 



Professor Thomson named specimens of P. formicarius^ Grav., taken 

 by Bridgman in the neighbourhood of Norwich (Trans. Ent. Soc. 1886,' 

 p. 341) ; and there is one male in the latter's collection there. Ratzeburgi 

 is recorded from the Hastings district (Vict. Hist. Sussex). This is 

 probably an uncommon species in Britain, since I possess but single 

 females from Shere in Surrey (Capron) ; Blean Woods in Kent (Chitty) ; 

 Felden in Herts. (Piffard) ; and Buddon Wood (Willoughby Ellis). I 

 swept a male in the Bentley Woods, near Ipswich, on 20th April, 1895. 

 Bridgman took his H. ovatus at Brundall, near Norwich, in the middle of 

 September, 1881. 



22. Miilleri, Forst. 



Pezomachus Muelleri, Furst. Wiegm. Arch. 1850, p. 159, ?. P. incertus, Forst. 

 lib. cit. p. 160, 9 . [(?) Heviimachus confusus, Bridg. Trans. Ent. Soc. 1883, p. 159, i .] 



$ . Basal flagellar joint slightly longer than the second ; fifth rather 

 longer than broad. Meso- and meta-thorax of equal length ; petiolar area 

 slightly oblique, its basal costa sharply defined and distinct throughout. 

 Abdomen closely punctate and pubescent, scarcely more diffusely towards 

 the apex ; basal segment gradually and evenly contracted throughout, with 

 the apex not broad, its spiracles not prominent ; terebra about as long as 

 the basal segment. 



Head dark castaneous ; antennae dark red, with the apex piceous, and 

 the base of the first flagellar joint pale. Thorax red, with its sides and 

 often the metanotum and petiolar area piceous. Abdomen piceous, with 

 the basal segment flavous ; the second entirely translucent red, as also are 

 the apical margins of the remainder ; sheaths of the terebra flavescent. 

 Legs pale red, with the tibiae centrally paler ; the femora and the apical 

 tarsal joint infuscate. Length, 2| mm. 



[?(?. Whole insect opaque and finely reticulate. Head buccate be- 

 hind the eyes, a little wider than the thorax. Antennae pilose ; three- 

 fourths of the length of the insect ; joints of flagellum shorter than usual ; 

 first more than three times as long as wide ; second and third sub-equal, 

 shorter than the first ; remainder decreasing in length, but none exactly 

 transverse. Thorax about as long as high ; mesothorax not trilobed ; 

 metathorax short, sloping almost from base to apex ; rough ; no trace of 

 areola ; petiolar area defined at sides only. Abdomen elongate-ovate, 

 covered with dense pubescence ; first segment elongate, tapering from 



