PTEROMALIDAE OF N.W. EUROPE 97 



own diameter from the clypeus, while the mesoscutum and scutellum are 

 thickly pilose ; body usually metallic. Males with body usually con- 

 spicuously metallic, at least in part ; if black or nearly so, then the antennal 

 toruli are separated by at least their own diameter from the clypeus, and the 

 mesoscutum is usually more thickly pilose ...... 5 



5 (4) Notauli incomplete, indicated at front of mesoscutum only. 



Antennal formula 11 253. Head and thorax with irregular, unusually 

 deep and fine reticulation. Anterior margin of clypeus truncate 



TERMOLAMPINI (p. 249) 



Notauli complete, nearly always deep throughout, rarely rather superficial 



posteriorly ORMOCERINI (most) (p. 250) 



6 (1) Anterior margin of clypeus edentate or with only one tooth or angular pro- 



jection ............ 7 



Anterior margin on clypeus with two or three projections (teeth or, rarely, 



rounded lobes) ........ y . . 11 



7 (6) Postmarginal vein of fore wing at least slightly longer than the marginal vein 8 



Postmarginal vein of fore wing not longer than the marginal vein ... 9 



8 (7) Pronotum either long, in dorsal view more than half the length of the meso- 



scutum, or else with a sharply margined collar ; petiole of gaster smooth or 

 nearly so, subconical, usually transverse, occasionally slightly longer than 

 broad TRIGONODERINI (part) (p. 98) 



- Pronotum in dorsal view less than half as long as the mesoscutum, the collar 



not defined but rounded off anteriorly ....... 9 



9 (8) Petiole of gaster conspicuous, reticulate, often longer than broad though 



occasionally transverse ; pronotal collar more or less distinctly margined 



SPHEGIGASTERINI (part) (p. 123) 

 Petiole of gaster inconspicuous, smooth or virtually so, transverse ; pronotal 



collar not margined, rounded off anteriorly ...... 10 



10 (9) Anterior margin of clypeus with a median tooth or tubercle 



MISCOGASTERINI (part) (p. 149) 

 Anterior margin of clypeus without a tooth or tubercle, truncate or curved 



forwards (Ormocerus, Meromalus) . . . ORMOCERINI (part) (p. 250) 



11 (6) Anterior margin of clypeus with (Text-fig. 128) three asymmetric teeth, or 



(Text-fig. 127) three curved lobes . . MISCOGASTERINI (part) (p. 149) 



Anterior margin of clypeus either with two teeth ; or, if with three, then they 



are sharp and symmetrically placed . . . . . . . 12 



12 (11) Pronotum viewed dorsally, about two thirds as long as the mesoscutum ; 



petiole of gaster small, subconical, smooth ; postmarginal vein of fore wing 

 slightly longer than the marginal vein . TRIGONODERINI (part) (p. 98) 



Pronotum usually sloping quite steeply and, in dorsal view, appearing less 

 than half as long as the mesoscutum ; if longer than this, then either the 

 gastral petiole is conspicuous and sculptured, or else the postmarginal vein 

 is not longer than the marginal vein . . . . . . . 13 



13 (12) Hind margin of basal tergite of gaster not broadly emarginate, at most weakly 



sinuate laterally ; anterior margin of clypeus bidentate (Text-fig. 170) or at 

 most (Text-fig. 43) with the left-hand tooth slightly notched or weakly 



bifid MISCOGASTERINI (part) (p. 149) 



Hind margin of basal tergite of gaster (Text-figs. 95, 96, 100) broadly emargin- 

 ate, except in Novitzkyanus, which has three symmetrically-placed teeth on 

 the anterior margin of the clypeus, and the basal tergite of the gaster very 

 large, almost covering the rest . . SPHEGIGASTERINI (part) (p. 123) 



