ig6 BRITISH ICHNEUMONS. \Pezomachus. 



1881 ; taken by Bridgman by sweeping in the Brundall marshes near 

 Norwich, and recorded l)y him (Trans. Ent. Soc. 1882, p. 148) from 

 Rainham in Essex, and subsequently from Horning Ferry in Norfolk. 

 Beaumont has taken it at Appledore in Kent in mid-September, and 

 Capron at Shere in Surrey. Piffard had found l)oth sexes at l''elden in 

 Herts. ; VV. Ellis the female at Knowle and I'^gginton, near liirnu'ngham ; 

 and Yerbury at Waterville in Ireland, in July. It has invariably occurred 

 to me by sweeping aquatic plants in April, June, July, September and 

 October at Ipswich, Bramford and Dennington, in Suffolk ; and in Ran- 

 worth Broad, in Norfolk ; the male I have only taken at Barton Mills, 

 near Brandon. 



14. mandibularis, Thorns. 



Pezoiiiachtis }iia7idihiilarjs. Thorns. O. E. x. 1009, i 9 ■ 



? . Frons alutaceous, dull ; lower face broad ; genal costa continuous ; 

 sulcus deep ; cheeks smooth, sub-compressed ; clypeus raised in front, 

 apex rounded ; mandibles scarcely tuberculate at base ; vertex broad, 

 narrowed behind the eyes, deeply and almost angularly emarginate. An- 

 tennae slender ; first joint of flagellum about as long as second, and half 

 as long again as the scape. Mesonotum elongate ; petiolar area well 

 defined, smooth, its basal costa present ; scutellum indicated ; acetabula 

 occupy nearly tlie whole of the mesosternum. Abdomen with moderate 

 pubescence, which is more diffuse towards the apex ; petiole long but not 

 broad ; post-petiole sub-transverse ; spiracles rather prominent ; terebra as 

 long as first segment. Femora rather slender. 



Head black, mandibles yellow. Thorax rufo-testaceous. Abdomen 

 testaceous, black-banded, or with the apex fuscous. Legs testaceous. 



$ . Winged. Mesosternum saccate ; epicnemia slender ; petiolar area 

 distinct. Parallel nervure emitted above middle of brachial cell ; nervellus 

 opposite ; radius emitted from centre of stigma, which is not broad. 

 Segment two of abdomen long. 



Black. Pronotum testaceous ; segments one to three yellow. Legs 

 testaceous. Length, 3-4 mm. 



Closely allied to P. carnifex, but differs in the female by the longer 

 mesonotum, more slender antennae and femora, more prominent spiracles, 

 shorter post-petiole, black head, flavous mandibles, and in the colour of 

 the abdomen. In the male it differs in the parallel nervure being emitted 

 above the middle of the cell, and in the testaceous pronotum. 



A single male of this species, taken in September by Bridgman, in the 

 neighbourhood of Norwich, was named by Professor Thomson (Trans. 

 Ent. Soc. 1886, p. 341). 



15. festinans, Gi-av. 



Pezomachus festinans, Gr. I. E. ii. 926, excl. synon. ; Fdrst. Wiegm. Arch. 1850, 

 p. 121, 9. P. poslhnmus, Fbrst. lib. cit. p. 138, 9. P. ocissintus, Forst. lib. cit. 1851, 



p. 36, i . 



9 . Head somewhat nitidulous. Antennae two-thirds the length of 

 the body, with the basal joint of flagellum as long as the second ; the fifth 

 somewhat longer than broad. Metathorax short, with the petiolar area 

 oblique, only slightly impressed and not costate basally. Scutellum very 



