238 G. E. J. NIXON 



scaly-reticulation between the punctures (except in meges) ; tergite 2 not obviously 

 transverse and not shorter than 3 ; if it shows division into three fields, then the 

 lateral fields are not transverse. 



Tergite 3 always rugose over at least most of its surface. Europe. N. America 



scotica-group (p. 251) 



18 Metacarp short, at most twice as long as its distance from the apex of the radial cell. 



Tergite 1 parallel-sided or narrowed behind . . . . . . 19 



- Metacarp longer, at least twice as long as its distance from the apex of the radial cell . 20 



19 Inner spur of the hind tibia short, hardly reaching beyond the middle of the hind 



basitarsus ; tergite 2 usually with a triangularly widened, median field ; surface 

 on each side of this field more weakly sclerotised, even thin, membranous and 

 smooth ; areolet reduced to the size of a hyaline point (Text-fig. 306) ; disc of 

 scutellum dull, densely rugose or rugose-punctate and sharply separated from 

 the posterior, polished band of the scutellum. 



Propodeum usually without a medial keel ; stigma tending to be short, broad. 

 Africa ......... lepelleyi- group (p. 258) 



- Inner spur of the hind tibia reaching considerably beyond the middle of the hind 



basitarsus ; tergite 2 showing as a large, coarsely rugose segment (vermiculately- 

 rugose), sometimes with poorly defined median field that is widest in front ; 

 areolet rather large (Text-fig. 302) ; disc of scutellum shiny and with only weakly 

 indicated sculpture ; hence, hardly separated from the posterior, polished band of 

 the scutellum. 



Propodeum with weak, medial keel. Europe . . . alvearius- group (p. 248) 



20 Propodeum with medial keel (hardly indicated in the N. Guinea group of enlerpe) . 21 



- Propodeum without a medial keel. 



Disc of the scutellum shiny and at most weakly punctate ; 1st abscissa of the 

 discoideus much shorter than the 2nd ; 2nd transverse cubitus united with the 

 2nd abscissa of the radius .......... 23 



21 Tergite 1 long, narrow, nearly four times as long as wide. Neotropical region 



/efaps-group (p. 263) 



- Tergite 1 at most about one and one third times longer than wide, widened behind. 



Tergite 2 divided into three fields of which the median is widest in front . 22 



22 Antenna very short, segments 10-12 being hardly longer than wide ; tergite 1 not 



longer than wide and much widened behind ; propodeum with some sort of 

 sculpture, usually punctation. Old World . . . spretus&roup (p. 255) 



- Antenna normal, long, the preapical segment fully two and a half times longer 



than wide ; tergite 1 about one and one third times longer than wide, slightly 

 widened behind ; propodeum polished and with faintly indicated, medial keel. 

 N. Guinea ......... euterpe- group (p. 250) 



23 Inner spur of the hind tibia much longer than the outer one and reaching well beyond 



the middle of the hind basitarsus ; 1st abscissa of the radius much longer than the 

 2nd, fully three times as long (Text-fig. 317) ; tergite 1 almost parallel-sided ; 

 tergite 2 with an elongate median field that is not triangularly widened behind. 

 Europe ......... calceatus- group (p. 256) 



- Inner spur of the hind tibia hardly longer than the outer one and hardly reaching 



beyond the middle of the hind basitarsus ; 1st abscissa of the radius about one and 

 and a half times longer than the 2nd (Text-fig. 304) ; tergite 1 strongly narrowed 

 behind, wedge-shaped ; tergite 2 with strongly triangular median field. Australia 



tegularis- group (p. 235) 



