PTEROMALIDAE OF N.W. EUROPE 103 



Key to European Species 

 (Females) 

 Gaster usually conspicuously red at the base, at least beneath, if hardly so, 

 then fore wing with three fuscous clouds. Fore wing either with more than 

 one cloud or, if only one, then this does not proceed from the stigma ; 

 basal part of stigmal vein forming an angle of 35 to 40 with the postmarginal 

 vein. Combined length of pedicellus and flagellum 1-25 to 1-35 times the 

 breadth of the head ; proximal segments of funicle relatively long, the 

 first two to three times as long as broad ...... 2 



Gaster not, or only very obscurely, red at base. Fore wing either immaculate, 

 or with one fuscous cloud which proceeds from the stigma ; basal part of 

 stigmal vein forming an angle of about 45° with the postmarginal vein. 

 Combined length of pedicellus and flagellum from 1 -05 to hardly 1 -2 times 

 the breadth of the head ; proximal segments of funicle relatively short, the 

 first 1-5 to i-8 times as long as broad ....... 3 



(1) Fore wing trifasciate, the middle fascia arising from the stigma and usually 

 joining the proximal fascia on the disc of the wing. Basal tergite of gaster 

 with its hind margin deeply incised medially . trifasciatus (Thomson) (p. 104) 

 Fore wing not trifasciate ; occasionally immaculate, but nearly always with a 

 fuscous discal cloud, often with a second cloud near the tip of the wing. 

 Basal tergite of gaster with its hind margin weakly to moderately deeply 

 incised medially ...... scenicus (Walker) (p. 104) 



(1) Scutellar frenum rather more coarsely reticulate than the disc of the scutellum. 

 Genae (Text-fig. 93) less buccate. Lower edge of antennal toruli about level 

 with the ventral edge of eyes. Metapleuron more strongly reticulate. 

 Fore wing usually with a fuscous cloud proceeding from the stigma 



coelius (Walker) (p. 105) 

 Scutellar frenum not more coarsely, or even rather more finely, reticulate than 

 the disc of the scutellum. Genae (Text-fig. 92) strongly buccate. Lower 

 edge of antennal toruli slightly above the level of the ventral edge of the 

 eyes. Metapleuron more weakly reticulate. Fore wing immaculate or 

 with a faint cloud proceeding from the stigma . cisae Hedqvist (p. 106) 



(Males) 



Antennae with seven funicular segments and a two-segmented clava ; flagel- 

 lum slender, rather sparsely clothed with whorls of long hairs (the length of 

 the hairs about twice the breadth of the segments that bear them) which stand 

 out at an angle of 70 to 80° ; scape rather long, reaching to about level of 

 vertex, rather more than three quarters the length of an eye, about four 

 times as long as broad, hardly dilated above the middle 



trifasciatus (Thomson) (p. 104) 



Antennae with six funicular segments and a three-segmented clava ; flagel- 

 lum rather thickly clothed with hairs whose length is at most slightly greater 

 than the breadth of the segments that bear them, and which stand out less 

 strongly ; scape shorter, reaching at most to about level of middle of 

 median ocellus ........... 2 



(1) Antenna : combined length of pedicellus and flagellum twice or rather more 

 than twice the breadth of the head ; funicular segments elongate (the first 

 3 to 3-5 times, the sixth 2-2 to 3 times, as long as broad) ; scape only about 

 two thirds as long as an eye, about three times as long as broad, distinctly 

 dilated above the middle and with a large shiny boss. Stigmal vein of fore 

 wing forming a relatively acute angle with the postmarginal vein 



scenicus (Walker) (p. 104) 



