258 M. W. R. de V. GRAHAM 



Systasis Walker ; Nikol'skaya, 1952 : 240. 

 Systasis Walker ; Boucek, 1955 : 324-327. 

 Systasis Walker ; Peck, 1963 : 644. 

 Systasis Walker ; Peck et al., 1964 : 33. 



The European species of Systasis have not been revised ; Boucek (1955) described 

 two new species, one of which falls into synonymy. 



Guieralia Risbec (described from Senegal) appears to me, from the descriptions of 

 the genus and its type-species, as well as Risbec's figure (136a) of the fore wing, to be 

 probably a synonym of Systasis. 



Key to European Species 

 (Males and Females) 



1 Metapleuron and sides of propodeum shiny and weakly sculptured ; meso- 



pleuron mainly, and mesosternum, with obsolescent alutaceous sculpture, 

 hence very shiny. Fore wing (upper surface) with basal cell closed below, 

 basal vein pilose, sometimes also a few hairs in the distal part of the basal 

 cell. Antennae with scape only slightly more than half as long as an eye 

 and not reaching the median ocellus ; sutures of clava, in female only 

 the second suture, oblique. Female with gaster lanceolate, as long as or 

 longer than head plus thorax ; combined length of pedicellus and nagellum 

 less than breadth of head, nagellum strongly clavate ; funicular segments 

 all transverse, distal ones strongly so ; clava broader than, and almost as long 

 as, the funicle. Male with combined length of pedicellus and nagellum less 

 than breadth of head ; nagellum distinctly clavate ; all funicular segments 

 transverse ; clava nearly as long as the funicle, apparently four-segmented, 

 there being a large offset portion at the apex of the third segment, (subgenus 

 Systasina Boucek) ...... annulipes (Walker) (p. 266) 



- Metapleuron and sides of propodeum strongly reticulate and relatively dull ; 



mesopleuron, and usually mesosternum, entirely reticulate or strongly 

 alutaceous. Fore wing (upper surface) with basal cell bare, open below ; 

 basal vein bare or with few hairs. Antennae with scape reaching at least 

 level with lower edge of median ocellus ; sutures of clava not oblique. 

 Female with gaster often relatively shorter ; combined length of pedicellus 

 and nagellum at least equal to breadth of head ; flagellum weakly clavate ; 

 funicular segments at most slightly transverse ; clava only slightly broader 

 than funicle, at most slightly longer than the three preceding funicular 

 segments together. Male with combined length of pedicellus and nagellum 

 at least slightly greater than breadth of head ; flagellum filiform or very 

 weakly clavate ; funicular segments not all transverse ; clava at most as 

 long as the three preceding funicular segments together, three-segmented, 

 with only a minute offset portion at the apex of the third segment (subgenus 

 Systasis s. str.) ........... 2 



2 (1) Fore wing (Text-fig. 195) beyond the speculum relatively more thickly pilose ; 



no bare area either between the postmarginal and stigmal veins, or below the 

 stigma. Lower face, laterad of the clypeus, either with very few and 

 shallow punctures which are relatively inconspicuous amongst the reticul- 

 ation of the surface, or virtually impunctate. Male antennal scape only 

 2-6 to 2-7 times as long as broad. 



Antennal scape of both sexes hardly reaching above the level of the vertex ; 

 flagellum of female (Text-fig. 192) rather slender, the funicle not stouter 

 than the pedicellus ...... tenuicornis Walker (p. 260) 



