206 BRITISH ICHNEUMONS. [Pezomachi/s. 



Wymondley in Herts. (Butler). Pickard- Cambridge took both forms, 

 among coarse herbage in Dorsetshire, while searching for spiders (Entom. 

 1881, p. 137). I have only once met with it, on a sunflower leaf in the 

 garden of Monks' Soham House, Suffolk, early in September ; Marshall 

 has given it me from Nunton in Wilts. ; Piffard several of both forms from 

 Felden in Herts. ; and Evans has sent it from Aberlady and Thorntonloch 

 in East Lothian, captured in March and August. Brandon, Suffolk, by 

 sweeping in a marsh, May, 1906. 



27. tonsus, Forst. 

 Pezoinachiis tonsils, Forst. Wiegm. Arch. 1850, p. 208, 9 ; Thorns. O. E. x. 1017, i ?. 



$ $ . Cheeks long and full ; sulcus indistinct ; costa inflexed ; man- 

 dibles tuberculate at base ; vertex broad ; clypeus truncate at apex. An- 

 tennae short and stout ; first joint of flagellum scarcely longer than 

 second ; fifth slightly longer than wide. Mesonotum transverse, as long 

 as the metanotum ; petiolar area slightly oblique ; its basal costa 

 moderately strong above, very prominent at sides. Abdomen finely alu- 

 taceous, diffusely punctured and pubescent, almost glabrous ; first segment 

 rather narrow at apex, its spiracles not projecting ; terebra as long as, or 

 longer than first segment. Legs stout ; anterior tibiae inflated ; anterior 

 coxae much produced backwards. 



Head black or black-brown ; palpi yellowish ; mandibles dark red. 

 Antennae red to middle, thence darker brownish. Thorax rufo-testaceous, 

 with sides and petiolar area brownish. Abdomen black ; segments one to 

 two red. Legs rufo-testaceous. Length, 3-4 mm. 



Male apterous. 



In both sexes very like P. acaroriim, but smaller ; vertex broader ; 

 cheeks longer ; abdomen more shining, almost glabrous, and, in female, 

 the terebra longer. 



Mousehold near Norwich, females bred from cocoons of Apanfeles con- 

 gesti/s, which were probably parasitic on Flusia gamma (Bridgman). 



28. pumilus, Forst. 



Pezomachus puiuilus, Ftirst. Wiegm. Arch. 1850, p. 131, 9; Thorns. O. E. x. 1006, 

 <J 9 . P. gi-andiceps. Thorns. ///'. cit. 1007, i 9 . 



$ . Cheeks short with the sulcus deeply impressed ; vertex deeply but 

 not broadly emarginate ; clypeus apically truncate. Antennae with the 

 two basal flagellar joints of equal length and the fifth rather longer than 

 broad. Thorax of normal length, with the metathorax decidedly short ; 

 petiolar area elongate with its basal costa wanting. Abdomen diffusely 

 punctate and pubescent ; basal segment gradually explanate from base to 

 beyond centre and thence more strongly to the moderately broad apex ; 

 tubercles wanting, post-petiole quadrate ; terebra not longer than the basal 

 segment. 



Piceous or black, with the first flagellar joint basally flavous. Legs 

 piceous, with the trochanters, apices of femora, extreme base of tibiae and 

 the tarsi, flavescent ; femora in general darker than the tibiae. 



