212 BRITISH ICHNEUMONS. [rezoniachus. 



and the base of first flagellar joint flavescent. Thorax deep red with the 

 pleurae narrowly black below. Abdomen with the two basal segments 

 clear red, the second sometimes with a piceous central mark ; remainder 

 suddenly black, with tlie apical margins obsoletely rufescent. Legs red ; 

 apical tarsal joint and the hind femora castaneous. Length, 4 mm. 



This species has not before been noticed in Britain, though probably 

 not rare here. Butler first took it at Chobham in Sei)tember, 1892 ; he 

 has also found it at Dallington Forest (cf. Vict. Hist. Sussex). I possess 

 several examples in Piffard's collection, taken at Felden in Herts. ; from 

 Edward Saunders, from Bury St. Edmunds ; Newbery, from Hampstead, 

 in July ; Capron from Shere ; and Bennett from flood refuse at Witersham, 

 in Kent. Chitty took it at Oxford in October, 1905. I swept a specimen 

 from reeds in the Southwold salt marshes at the end of September, and 

 took another on herbage in a marshy spot at Claydon, in June. 



33. impotens, ForsL 



Pezomachiis horlensis, var. 6, Gr. I. E. ii. 910, 9 . P. impotens, Forst. Wiegm. Arch. 

 1850, p 221, 9. 



? . Antennae with first joint of flagellum slightly longer than second ; 

 fifth almost quadrate. Meta- distinctly longer than the meso-thorax ; costa 

 of petiolar area fine, not prominent, and only slightly projecting below. 

 Abdomen very shining, punctuation diffuse and pubescence short ; first 

 segment with distinctly projecting spiracles, its apex rather narrow ; terebra 

 not quite as long as first segment. 



Head deep black ; antennae red to middle, thence darker to the brown 

 apex ; the scape also brown. Thorax red ; base of mesothorax, petiolar 

 area near insertion of petiole, and the sternum round the middle and 

 hind coxae, blackish. Abdomen with first segment red ; second red, with 

 a more or less distinct basal brownish transverse band ; three to six black, 

 the apex of sixth and whole of seventh reddish. Legs red ; all femora with 

 apical half brownish ; the tibiae less distinctly brown at apex only, and 

 the last tarsal joint brown. Length, 3-4 mm. 



The female has a strong superficial resemblance to P. inen/iis, but is 

 distinguished by the much longer metathorax, stronger ridge, as well as by 

 the projecting spiracles and narrow apex of first segment. 



^ . Head transverse, entirely black, very closely shagreened and dull ; 

 vertex somewhat narrow and not emarginate, rounded behind the eyes ; 

 clypeus discreted and apically rounded ; face longitudinally prominent, 

 callose beneath each scape. Antennae filiform, slender and as long as the 

 body, black with the first flagellar joint basally rufescent and only slightly 

 longer than the second. Thorax dull black, notauli distinct but not 

 basally coalesced ; mesonotum deplanate ; metanotum completely areated 

 with only the costulae sub-obsolete ; areola sub-pyriform and longer than 

 broad, apophyses small and acute. Abdomen black, elongate-ovate, very 

 sparsely pubescent and dull, with the anus more shining ; basal segment 

 thrice length of its apical breadth, spiracles obsolete, post-petiole hardly 

 broader than the petiole and not at all explanate ; its extreme apex, whole 

 of the second except a broad determinate central transverse fascia, and 

 the basal angles of the third segment, brick-red. Legs red with the pos- 

 terior coxae, hind femora and apices of their tibiae, black. Wings slightly 



