PTEROMALIDAE OF N.W. EUROPE 285 



produced, but almost truncate medially. Antennal scape black or mainly 



so. Surface of mesoscutum and scutellum more shiny . viridis Walker (p. 311) 



42 (40) Head and thorax, except pronotum, and occasionally the scutellum and 



axillae, green to blue, usually brightly so ; exserted portion of ovipositor 

 sheaths, in profile, at least half as long as hind tibia .... 49 



Either the thorax at least is bronze to coppery with at most the mesoscutum 



slightly greenish ; or the ovipositor sheaths are less far exserted . . 43 



43 (42) Ovipositor sheaths hardly exserted, just the tips visible in dorsal view ; 



marginal vein of fore wing about 2-8 times as long as the stigmal vein ; 

 body mainly bronze or coppery ; head strongly transverse, in dorsal view 

 nearly 2-5 times as broad as its maximum length .... sp. indet. 



- Ovipositor sheaths usually distinctly exserted ; if hardly so, then the 



marginal vein is at most 2-4 times as long as the stigmal vein, the body is 

 partly greenish or bluish, and the head is relatively less transverse . . 44 



44 (43) Female gaster, not counting ovipositor sheaths, as long as, or slightly longer 



than, head plus thorax, tending to be lanceolate and somewhat compressed 45 



- Female gaster, not counting ovipositor sheaths, not or hardly longer than the 



thorax, more ovate and not or only slightly compressed .... 46 



45 (44) Anterior margin of clypeus slightly truncate medially (Text-fig. 260). Fore 



wing with speculum extending only as far as the end of the proximal third of 

 the marginal vein ; about the distal third to half of the basal cell has scat- 

 tered hairs. Exserted portion of ovipositor sheaths, in profile, from three 

 quarters as long as, to slightly longer than, the hind tibia 



vagans Westwood (p. 312) 

 Anterior margin of clypeus strongly curved. Fore wing with speculum, on 

 upper surface of wing, extending as a bare strip nearly or quite to the 

 stigmal vein ; basal cell pilose only at apex, next to the basal vein. Exserted 

 portion of ovipositor sheaths, in profile, from slightly more than one third, 

 to slightly more than half, as long as the hind tibia . . affinis sp. n. (p. 312) 



46 (44) Antennal flagellum proximally hardly as stout as the pedicellus in profile, but 



strongly clavate distally, testaceous proximally and darkening distad ; 

 head and thorax mainly to entirely bronze or coppery bronze ; small 

 species, 1-4 to i-6 mm. ..... clavellatus sp. n. (p. 315) 



- Antennal flagellum (Text-fig. 257) proximally as stout, or usually slightly 



stouter than the pedicellus, more weakly clavate, entirely fuscous to black ; 

 at least the mesoscutum bluish or greenish, sometimes the body is more 

 extensively blue or green ......... 47 



47 (46) Larger species, 1-7 to 2-3 mm. ; mid lobe of mesoscutum with numerous con- 



spicuous piliferous punctures amongst the reticulation ; ovipositor sheaths 

 only slightly exserted, at most as long as first segment of hind tarsus ; 

 scutellum with three to four pairs of bristles. 



Fore wing venation, Text-fig. 262 .... laticeps sp. n. (p. 316) 



- Smaller species, 1-3 to i-8 mm. ; mid lobe of mesoscutum with fewer, and 



often less distinct, piliferous punctures ; ovipositor sheaths usually farther 

 exserted, if not then scutellum with only two pairs of bristles ... 48 



48 (47) Ovipositor sheaths, in dorsal view, exserted to a length at most equal to that of 



first segment of hind tarsus ; scutellum with two pairs of bristles. Marginal 

 vein of fore wing 2-25 to 2-4 times as long as the stigmal vein ; speculum 

 extending below marginal vein only for about half the length of the latter 

 (Text-fig. 256) ....... hemigaster sp. n. (p. 314) 



- Exserted portion of ovipositor sheaths from one third to about half as long as 



hind tibia ; scutellum nearly always with three pairs of bristles, rarely two 

 pairs. Either the marginal vein is 2 -5 to 2 -8 times as long as the stigmal vein, 



