PTEROMALIDAE OF N.W. EUROPE 219 



(Males) 



1 Scutellar frenum shiny, with some longitudinal carinulae, but otherwise weakly 



reticulate or nearly smooth. Postspiracular sclerite with oblique carina 

 weak and irregular, or absent. Fore wing with stigma longer than high, 

 moderate-sized ; no bare line just outside the basal vein, but sometimes an 

 isolated bare spot a little below the parastigma. Both mandibles with four 

 teeth ............ 2 



- Scutellar frenum not very shiny, finely reticulate, with or without longitudinal 



carinulae. Postspiracular sclerite with oblique carina usually strong and 

 sharp. Fore wing with stigma sometimes as high as long, sometimes large ; 

 often a bare line just outside the basal vein, but no isolated bare spot below 

 the parastigma. Left mandible with three teeth except in tnmidus, which 

 has a very sharp oblique carina on the postspiracular sclerite ... 3 



2 (1) All femora, tibiae, and tarsi except their tips, yellow. Mesoscutum mainly 



with delicate engraved sculpture. Sculptured part of gastral petiole 

 somewhat broader than long .... lesches (Walker) (p. 225) 



- Femora infuscate at least proximally. Mesoscutum, at least mainly, with 



scaly-reticulate sculpture which is slightly raised above the general surface. 

 Sculptured part of gastral petiole as long as or longer than broad 



obscurus (Walker) (p. 224) 



3 (1) Gastral petiole with the main, sculptured portion raised above the basal 



stalk, and bounded anteriorly by an arcuate crest. Antennal scape at 

 least mainly testaceous. Left mandible with three teeth, right mandible 

 with four. Hairs of flagellum standing out only slightly 



scaposus Thomson (p. 220) 



- Gastral petiole with the main, sculptured part not delimited anteriorly by 



a crest. Antennal scape at most broadly testaceous basally ... 4 



4 (3) POL slightly greater than OOL ; head in dorsal view (Text-fig. 173) only 



2-2 to 2-25 times as broad as long, with temples rounded posteriorly. Both 

 mandibles with four teeth. Antenna with hairs of flagellum standing out 

 at an angle of about 45 . Small species, not more than 2-2 mm., with 

 relatively dark legs. Fore wing with stigma tending to be subcircular or 

 subrectangular ....... tumidus (Walker) (p. 221) 



POL about equal too, or even a little less than, OOL ; head in dorsal view 

 (Text-figs. 174, 175) rather more transverse, or with the temples rather 

 more prominent. Left mandible with three teeth, right with four. Species 

 sometimes with hairs of flagellum standing out less strongly, or larger, or 

 with stigma differently shaped ........ 5 



5 (4) Antenna with combined length of pedicellus and flagellum about 1-75 times 



breadth of head ; hairs of flagellum standing out at an angle of about 45 ; 

 scape slightly expanded above its middle, its outer surface with a shiny boss 

 which extends nearly half way down. Large species, 2-5 to 3-3 mm. 

 Thorax not strongly arched dorsally ; metanotum and propodeum sloping 

 at an angle of about 45 relative to the plane of the mesoscutum and 

 scutellum. Propodeum shiny medially, on either side of the median carina 



lamprosomus sp. n. (p. 222) 

 Antenna with either combined length of pedicellus and flagellum at most 1 -6 

 times breadth of head ; or hairs of flagellum standing out only slightly, 

 and size at most 2-3 mm. Thorax usually more strongly arched dorsally 

 with metanotum and propodeum sloping at a steeper angle ... 6 



6 (5) Fore wing with stigma fully as high as long, tending to be subcircular or 



subrectangular in shape. Large species, 2-7 to 3-2 mm. Scutellar frenum 

 reticulate, without any obvious longitudinal carinulae. Antenna with 



