424 M. W. R. de V. GRAHAM 



by Gyorfi (1952) employed unreliable characters for identifying the species, some of 

 which were known to the author only through the literature. 



Key to European Species 

 (Females) 



1 Fore wing with postmarginal vein about twice as long as the stigmal vein ; 



marginal vein 2-3 to 2-7 times as long as the stigmal vein ; wing beyond 

 the speculum densely pilose ; the area between the postmarginal and 

 stigmal veins completely pilose ; speculum, in upper surface of wing, 

 extending below the marginal vein for at most about half the length of the 

 latter. 



Antennae with combined length of pedicellus and flagellum approximately 

 equal to breadth of head ; anelli subequal in length, the third anellus at 

 most very slightly longer than either of the others. Ovipositor sheaths in 

 dorsal view with hairs standing out at an angle of 20° to 25°, none of these 

 bristly in appearance. Anterior margin of clypeus slightly produced in the 

 middle ........ mirus (Walker) (p. 425) 



Fore wing with postmarginal vein at most about 1 -5 times as long as the 

 stigmal vein, marginal vein 1-75 to 1-9 times as long as the stigmal vein, 

 if the postmarginal vein is as much as 1 -5 times as long as the stigmal vein, 

 then the wing beyond the speculum is less densely pilose and the area be- 

 tween the postmarginal and stigmal veins is partly bare ; speculum on upper 

 surface of wing extending nearly or quite to the stigmal vein ... 2 



2 (1) Fore wing with postmarginal vein about 1 -5 times as long as the stigmal vein ; 



marginal vein 1 -75 to 1 -8 times as long as the stigmal vein. Antennae with 

 combined length of pedicellus and flagellum approximately equal to breadth 

 of head ; pedicellus not or hardly longer than first funicular segment ; third 

 anellus longer than either of the others ; segments of funicle relatively 

 longer, at most four and five slightly transverse. Ovipositor sheaths with 

 short hairs which in dorsal view appear subadpressed, except at the tips of 

 the sheaths, where there are several longer, more outstanding bristly hairs. 

 Anterior margin of clypeus slightly produced in the middle 



xylophagorum (Ratzeburg) (p. 425) 

 - Fore wing with postmarginal vein not or hardly longer than the stigmal vein ; 



marginal vein i-8 to 1-9 times as long as the stigmal vein. Antennae with 

 combined length of pedicellus and flagellum somewhat less than breadth of 

 head ; pedicellus distinctly, up to about twice, longer than first funicular 

 segment ; anelli subequal in length ; segments of funicle relatively short, 

 the second at least very slightly, fifth strongly, transverse. Ovipositor 

 sheaths in dorsal view similar to those of mirus, but with some stronger 

 bristly hairs at their tips. Anterior margin of clypeus truncate or virtually 

 so ....... . brevicornis Thomson (p. 426) 



(Males) 



Some differences in the male genitalia of the three species have been illustrated by 



Hedqvist (1963, fig. 32). 



1 Fore wing with postmarginal vein nearly twice as long as the stigmal vein ; 



speculum, on upper surface of wing, extending below the marginal vein for 



only about half the length of the latter. Base of gaster more or less 



yellowish mirus (Walker) (p. 425) 



