PTEROMALIDAE OF N.W. EUROPE 187 



than broad. Marginal vein about i-6 times as long as the stigmal vein ; 

 stigma small . . . . . . . ? berani (Delucchi) (p. 198) 



- Antennal scape usually mainly to entirely dark, if extensively testaceous then 



the malar space is only about two fifths the length of an eye. Gaster at 

 least slightly less than twice as long as broad, usually not longer than the 

 thorax (occasionally slightly so) ........ 20 



20 (19) Antennae with sensilla of funicle relatively short, arranged in two irregular 



rows on each segment, sometimes three rows on the first segment ; flagel- 

 lum filiform or virtually so. Relatively large species, 2-4 to 3 mm. Gastral 

 petiole 1-5 to 2-2 times as broad as long ...... 26 



Antenna with sensilla of funicle relatively long, arranged in one (sometimes 

 slightly irregular) row on each segment ; flagellum usually subclavate, if 

 virtually filiform then smaller species not more than 2-2 mm. in length. 

 Gastral petiole often relatively less transverse . . . . 21 



21 (20) Thorax short, in dorsal view only 1 -25 to 1 -35 times as long as broad, strongly 



arched dorsally so that the dorsellum and propodeum slope nearly or quite 

 vertically to the plane of the mesoscutum. Malar space slightly more than 

 one third the length of an eye. Stigma of fore wing rather small (slightly 

 larger than in tarsale, cf. Text-fig. 153). Gaster 1-5 to i-6 times as long 

 as broad, as long as or slightly longer than the thorax 



parviclava (Thomson) (p. 199) 

 Thorax longer, in dorsal view 1-5 to 1-75 times as long as broad, usually less 

 strongly arched dorsally with the dorsellum and propodeum sloping less 

 steeply ; if the thorax is only 1 -5 times as long as broad and is nearly as 

 strongly arched as in parviclava, then the malar space is only about one 

 third the length of an eye, and the stigma of the fore wing is larger . . 22 



22 (21) Malar space approximately one third the length of an eye. Thorax 1-5 to i-6 



times as long as broad. Gaster not or only slightly (up to 1 -2 times) longer 

 than broad, slightly shorter than the thorax ; basal tergite occupying 

 from two fifths to slightly more than half the total length. Fore wing with 

 stigma moderate-sized (much as in diffine, cf. Text-fig. 152). Thorax, 

 excluding propodeum, usually dull bronze, often suffused with violet 

 especially on the mesoscutum and scutellum . . aeneum (Walker) (p. 199) 



Malar space at least slightly more than one third the length of an eye. Thorax 

 i-6 to 1-75 times as long as broad. Gaster 1-3 to i-6 times as long as 

 broad, usually as long as or a little longer than the thorax ; basal tergite 

 sometimes relatively shorter. Thorax varying from olive-green to bright 

 green or blue ; occasionally the scutellum and axillae tinged with bronze . 23 



23 (22) Stigma of fore wing relatively smaller (Text-fig. 153), separated by 2-5 to 3-8 



times its height from the costal edge of the wing ; first funicular segment of 

 antenna most often slightly shorter than the pedicellus, funicle proximally 

 tending to be rather slender .... tarsale (Walker) (p. 201) 



Stigma of fore wing on the average larger (Text-fig. 152), separated by 2 to 2-5 

 times its height from the costal edge of the wing ; first funicular segment 

 usually as long as, or slightly longer than, the pedicellus ; funicle proxi- 

 mally tending to be slightly stouter than the pedicellus .... 24 



24 (23) Antenna with combined length of pedicellus and flagellum only i-i to 1-15 



times breadth of head ; flagellum stout, filiform or virtually so. Gastral 

 petiole i-6 to i-8 times as broad as long. Length 2-1 to 2-4 mm. 



euroto (Walker) (p. 204) 

 - Antenna with combined length of pedicellus and flagellum 1-3 to 1-4 times 



breadth of head ; flagellum subclavate, rather more slender proximally. 

 Gastral petiole i-i to 1-5 times as broad as long. Length 1-5 to 2 mm. . 25 



