3i8 M. W. R. de V. GRAHAM 



more strongly alutaceous and less shiny, its spiracles nearly touching the metanotum. 

 From crassus it also differs in having the ovipositor sheaths only slightly exserted, 

 the marginal vein only 2-1-2-3 (instead of 2-5-2-8) times as long as the stigmal 

 vein, the speculum extending only about half way below the marginal vein, the 

 propodeum longer, medially about as long as the scutellar frenum, in crassus slightly 

 to much shorter than the frenum. 



Holotype $. England : Buckinghamshire, Hell Coppice, near Oakley, 2.vi.i953, 

 swept from mixed herbage (Graham), in Hope Department, University Museum, 

 Oxford. 



Paratypes. Same data as holotype. 1 $ ; same locality as holotype, 1 $, 24.VL 

 1958 (Graham) ; Berkshire, Bagley Wood, 1 $, 23. v. 1954 (Graham) ; Shropshire, 

 Wyre Forest, 1 $, 14. v. i960 (R. R. Askew). Ireland : Co. Wicklow, Knickeen, 

 1 $, 2.vii.i95o (Graham), in Graham and Askew collections. 



Biology. Unknown. 



The CITRIPES-Grovp 



Gastrancistrus citripes (Thomson) 



(Text-figs. 246, 252) 



Tridymus citripes Thomson, 1876a : 197. 



Gastrancistrus citripes (Thomson) Dalla Torre, 1898 : 203. 



Type material. Syntypes, 5 specimens. LECTOTYPE, a female labelled " Lp 

 in " [Lapponia inferioris] ; " Bhn " [Boheman] ; " 14/6 " ; and " citripes ". Two 

 of the other syntypes (females) represent a new species, which is described below. 



Sweden, apparently rare. 

 Biology. Unknown. 



Gastrancistrus lativentris sp. n. 



(Text-fig. 247) 



9. Body bright green, golden or blue-green ; middle tergites of gaster tinged with bronze 

 or purplish, which tends to form transverse fasciae. Mandibles yellow with reddish teeth. 

 Antennae, palpi, tegulae, and legs including fore coxae, citron-yellow ; tips of tarsi brownish. 

 Wings hyaline, venation yellowish. Length 1-3 to 2 mm. 



Head about 1-2 times as broad as mesoscutum, in dorsal view 1-15 to 1-2 times as broad as 

 long, with temples short, about one seventh as long as eyes, and rounded off ; ocelli in a triangle 

 whose base is about 1-3 times its height, POL i-6 to 1-7 OOL. Head in frontal view about 1-3 

 times as broad as high. Eyes separated by about 1 -25 times their length. Malar space slightly 

 more than one third the length of an eye ; breadth of oral fossa about 2-7 times the malar space. 

 Clypeus about 2-7 times as broad as long, its anterior margin evenly and quite strongly curved. 

 Mandibles moderate-sized, not falcate, their lower margin hardly sinuate ; all four teeth acute, 

 much as in venustus sp. n. Head with fine engraved sculpture, moderately shiny, the vertex 

 rather duller ; scrobes smooth and polished. Antennae (Text-fig. 247) very similar to those of 

 citripes (Thomson) but with combined length of pedicellus and flagellum slightly less than 

 breadth of head ; first funicular segment nearly two thirds as long as the pedicellus, varying 



