2l6 BRITISH ICHNEUMONS. [Fezomachus. 



with the basal segment distinctly paler, the second usually red-yellow at 

 all its margins, and the remainder faintly flavescent apically. Legs fulvous, 

 with the apical tarsal joint and claws piceous. Length, 2\-\ mm. 



? c? . Apterous. Head black, palpi flavescent and mandibles basally 

 red. Antennae with the three basal joints fulvous, the fourth darker and 

 remainder gradually becoming piceous ; first flagellar joint about as long 

 as the second ; fifth fully twice longer than broad. Thorax black, with 

 the metanotum except discally, and the discreted scutellum, red ; petiolar 

 area somewhat high, its basal costa distinct and forming a slightly depressed 

 and rather narrow central curve ; apophyses unusually prominent. Abdo- 

 men black, with the three basal segments closely punctate and red, with 

 the base of the first and second, and most of the third, black ; basal seg- 

 ment equally and slightly explanate throughout, with the ajjcx narrow and 

 tubercles wanting ; remainder faintly flavescent apically. Legs somewhat 

 pale fulvous. Length, 4 mm. 



The female is said to differ from P. providus, which has the petiolar 

 area sub-oblique, in the longer metathorax and the less dense pubescence ; 

 the colour of the thorax is also more uniform. Till more fully diagnosed, 

 however, these trifling distinctions can hardly be considered sufficient to 

 accord the latter specific rank. 



[There can, I think, be no doubt that Ratzeburg's species is synony- 

 mous, though his description is somewhat meagre : Antennae somewhat 

 long ; first and second flagellar joints of equal length, the second longer 

 than broad ; entirely red-brown, except the extreme apex. Thorax red, 

 piceous above the coxae, with the petiolar area basally only weakly costate. 

 Abdomen closely pubescent on the three basal segments, more sparsely 

 towards the apex ; mostly, except the basal segment, dark ; terebra as long 

 as the basal segment. Legs (probably) red. Length, \\ lines.] 



P. modestus is a very abundant species in the spring and autumn. I 

 have records from Bungay, Tostock and Finborough Park, in Suffolk 

 (Tuck) ; Box Hill, Oxshott and Cobham (Beaumont) ; Oxford, Charing 

 and Doddington in Kent (Chitty) ; Church Stretton and Harborne (W. 

 Ellis) ; Felden in Herts. (Piffard) ; Cromer (Elliott) ; Isle of Mull 

 (Tomlin) ; Hillend, near Edinburgh (Evans) ; Shotover, near Oxford 

 (Hamm) ; and have taken it myself by beating juniper at Chipperfield 

 Common in Herts. ; poplar in Assington Thicks, in Suffolk ; in moss in 

 the Bentley Woods near Ipswich, and Guestling Wood near Hastings ; 

 swept it from dead reeds at Foxhall; and found it in tufts of Ai'ra caespitosa 

 at Peppering, in Sussex. Ratzeburg bred his species from Tortrix piceana, 

 and adds that it was " probably parasitic on a parasite of a parasite." 



38. agilis, Grav. 



Pezoiiiachus agilis, Grav. I. E ii. S94, i 9 ; Fiirst. Wiegm. Arch. 1S50, p. 171, 9; 

 Thorns. O. E. X. 1016, 6 9- P- spurius, Fdrst. Wiegm. Arch. 1850, p. 194, 9 , 



$ . Genal costae inflexed and their sulcus nearly obsolete ; mandibles 

 basally tuberculate ; clypeus apically truncate and not elevated. Antennae 

 short and stout ; basal flagellar joint longer than the second, the fifth very 

 slightly longer than broad. Thorax short with the mesonotum transverse 

 and shorter than the metathorax ; petiolar area oblique, its basal costa 

 centrally obsolete, apophyses strong though obtuse ; acetabula occupying 



