346 M. W. R. de V. GRAHAM 



costal cell rather narrow, its front margin slightly concave ; basal cell, on upper surface of 

 wing, with a patch of several hairs in its distal portion ; marginal vein, not including the para- 

 stigma, 6 to 6-5 times as long as the stigmal vein, the latter forming a moderately acute angle 

 with the postmarginal vein ; stigma small, subtriangular ; postmarginal vein about as long as 

 the stigmal ; fringe of apical margin long, its longest bristles equal to or greater than the length 

 of the stigmal vein. Legs rather slender ; hind tibial pecten (cf. Text-fig. 281) hardly developed. 



Gaster (Text-fig. 274) about as long as head plus thorax, more or less, though not strongly, 

 compressed ; hypopygium extending to between two thirds and three quarters of its length ; 

 exserted portion of ovipositor sheaths two thirds to three quarters the length of the hind tibiae. 



o*. Differs from the female as follows : 



Legs tending to be more extensively pale ; sometimes the fore tibiae, occasionally also the 

 fore femora, are wholly testaceous ; tarsi sometimes more or less testaceous. Antennal scape 

 slightly broader, hardly four times as long as broad. Gaster hardly longer, but much narrower, 

 than the thorax, strongly compressed. Pecten of hind tibia slightly more developed (Text-fig. 

 281). 



Holotype $. Scotland : Mid Perth, Killin, 7^1.1952, swept in a marshy place 

 near Finlarig Castle (Graham), in Hope Department, University Museum, Oxford. 



Paratypes. Same data as holotype, many <$<$ and $$ (Graham). England : 

 Yorkshire, Askham Bog, 2 $, 12.vii.1953 (W. D. Hincks), in Graham collection and 

 Manchester Museum. 



Biology. Unknown. 



This is a very distinct species, easily recognizable by the conspicuously metallic 

 tints of the head and thorax, combined with the large patch of hairs in the distal part 

 of the basal cell of the fore wing, and the ovipositor sheaths of the female which are 

 more strongly exserted than in all the other species with the exception of eximia 

 Haliday. 



Pirene herbacea sp. n. 



(Text-fig. 280) 



$. Resembles that of pallidum sp. n., but differs as follows : 



Antennae darker, the scape and pedicellus not distinctly pale-marked. Legs darker ; only 

 the knees and sometimes the tips of the tibiae narrowly, testaceous ; tarsi sometimes testaceous 

 beneath. 



Antennae with flagellar segments one to three relatively a little smaller, distinctly smaller 

 than four, the combined length of segments one to four at least slightly less than that of the 

 pedicellus (as in Text-fig. 280) ; segment five quadrate or at most very slightly transverse ; 

 clava slightly longer, nearly as long as pedicellus plus funicle. Fore wing : basal cell, on upper 

 surface of wing, with only one or two hairs distally besides those on the basal vein and the 

 adjacent parts of the cubital vein ; marginal vein only about five times as long as the stigmal 

 vein. Ovipositor sheaths less exserted, their projecting portion at most slightly more than one 

 third the length of the hind tibia. 



o*. Differs from the female as follows : 



Antenna (Text-fig. 280) with scape slightly more expanded, hardly four times as long as 

 broad. Gaster hardly longer, but much narrower, than the thorax, strongly compressed. 



The eyes resemble those of the female in having their facets of uniform size, and are 1 -5 to 1 -6 

 times as long as broad. 



Holotype $. England : Berkshire, Wytham, 29.vi.1951, swept in a damp 



