3o 4 M. W. R. de V. GRAHAM 



bristles ; surface with extremely fine, engraved or hardly raised alutaceous sculpture, that of 

 the frenum, which is marked off by a fine but distinct line, is a little coarser. Dorsellum weakly 

 alutaceous, shiny. Fore wing with speculum, on upper surface of wing, closed or nearly closed 

 below ; stigma moderate-sized, its height slightly less than, or at most as great as, the distance 

 between its upper edge and the lower edge of the postmarginal vein. 



Gaster lanceolate-ovate to lanceolate, 2-15 to 2-7 times as long as broad, about as long as 

 head plus thorax on the average, sometimes a little less or a little greater. 



o\ Differs from the female as follows: 



Antennal scape varying from brownish testaceous to entirely black with a metallic tinge ; 

 in British examples the flagellum is more or less heavily infuscate dorsally. 



Antennae (Text-fig. 241) with scape slightly broader, about 3-5 times as long as broad, a little 

 wider above the middle than below it ; flagellum practically filiform, distinctly thicker than the 

 pedicellus in profile, with its bristles relatively a little longer and rather more outstanding ; 

 the first funicular segment is quadrate to very slightly elongate, the rest are quadrate to slightly 

 transverse ; clava about twice as long as broad, only about as long as the two preceding funicular 

 segments together. 



Gaster sublinear, about as long as, but only about half as broad as, the thorax. 



Britain, Ireland, Germany, Sweden, Czechoslovokia (but probably more 

 widely distributed). Felt (1902) recorded it from New York State as a parasite of 

 Rhabdophaga salicis on galled willows which may have been of European origin ; the 

 parasite was identified by Ashmead, possibly correctly though the specimens should 

 be checked if still in existence. 



Detailed measurements were made on the following material : England : 

 Cambridge, 2$, 1937, reared from "Cecidomyiid galls on willow" (E. McC. Callan) ; 

 Surrey, Epsom, 10 $, 23. iv. 1927, 1^,1$, 4.VL1928, 1 $, 9.VL1928, all reared from 

 galls of Rhabdophaga salicis (Schr.) (M. Niblett) ; unlocalized, 2 $, 27.vi.1917, from 

 " galls of Cecidomyia sp. on long-leaved willow " (F. D. Morice), 1 $ in coll. Marshall 

 as " Seladerma capreae " , 2 $ and 1 $ in coll. Walker as " Tridymus salicis " ; all 

 these specimens are in the BM(NH). Others, probably all Walker material, stand 

 in the Hope-Westwood and Dale collections (Oxford) under the name "Seladerma 

 capreae ". North Wales, unlocalized : 2 $ from galls of Rhabdophaga salicis (Schr.), 

 reared June 1912 (A. W. Dennis), in BM(NH). Ireland : Co. Antrim, Ballycastle, 

 3$ $$, 7.VL1927, reared from Cecidomyiid galls on Salix (Miss Knowles). Germany : 

 Aachen, specimens in coll. Forster, labelled " Pteromalus salicis Nees ". Sweden : 

 Halland, Enslov, <$<$ reared 14.iii.1954 and 15.iii.1954, $$ reared 17.iii.1954 and 

 20. hi. 1955, from galls of Rhabdophaga on Salix aurita L. {Hugo Andersson). 



Gastrancistrus fulvicoxis sp. n. 



(Text-fig. 234) 



9- Head and thorax varying from golden green through green to greenish blue. Mandibles 

 testaceous with darker teeth. Antennae fulvous ; scape usually more or less darkened at the 

 apex dorsally ; pedicellus more or less so in its basal half dorsally ; flagellum infuscate dorsally. 

 Legs fulvous with knees slightly paler ; fore and mid coxae sometimes with a dark spot at the 

 base ; hind coxae usually having their proximal half to two-thirds black with a metallic tinge, 

 occasionally almost entirely dark ; rarely the femora are faintly brownish proximally ; tarsi 

 usually brownish distally, their fifth segment fuscous. Tegulae fulvous ; wings hyaline or 



