176 M. W. R. de V. GRAHAM 



o*. Antennae with scape slightly shorter, not quite or only just reaching the lower edge of 

 the median ocellus ; hairs of flagellum slightly longer, length about equal to breadth of flagellar 

 segments, and tending to stand out a little more strongly. Mid lobe of mesoscutum less shiny, 

 with stronger sculpture (as in $). Temples, in dorsal view of head, converging more strongly. 



STYLOMERISMUS sgen. n. 



(Derivation : Greek aruXo^, a pillar or pale, -f Merismus. Gender : Mas- 

 culine). 



Type-species. Merismus rufipes Walker, 1833. 



Merismus (Stylomerismus) lasthenes (Walker) comb. n. 



Sphegigaster Lasthenes Walker, 1848 : 108, 165, $. 



Type material. One female, LECTOTYPE, bearing a Waterhouse label. 



Britain, rare : " England " (Walker, 1848 : 108) ; Scotland, Perthshire, Lawers, 

 19.vii.1954 (Graham). 

 Biology. Unknown. 



Merismus (Stylomerismus) rufipes (Walker) 



Merismus rufipes Walker, 1833 : 378, $. 



Type material. Three Walker specimens (2$, 1$ ) stand under this name but I 

 am not sure that all are original specimens. Lectotype, the female (designated by 

 Graham, 1956 : yy). 



Britain, local : Isle of Wight (Walker, 1833 : 378) ; Cornwall, Marazion, 7.vii. 

 1955 ; Oxfordshire, Otmoor, 18. ix. 1956 (Graham). My specimens were all captured 

 in marshy places. 



Biology. Unknown. Imagines July-Sept. 



Merismus (Stylomerismus) nitidus (Walker) comb. n. 



Miscogaster nitida Walker, 1833 : 462, <$ $. 



Type material. Two <$, 1 $. LECTOTYPE, the female, bearing a Waterhouse 

 label. 



Britain, Ireland, local. 



Biology. Unknown. Imagines Aug.-November. 



CALLIMERISMUS Graham 



Callimerismus Graham, 1956 : 78. Type-species : Merismus fronto Walker, 1833, by original 

 designation. 



