PTEROMALIDAE OF N.W. EUROPE 291 



Biology. Parasitic on Syndiplosis petioli (Kieff.) (Dipt., Cecidomyiidae) on 

 Populus tremula L. (Boucek, 1964). 



Species sola 



Gastrancistrus coxalis (Thomson) comb. n. 



Tridymus coxalis Thomson, 1876a : 195, $. 



Type material. One female, LECTOTYPE (though possibly holotype), labelled 

 " Scan ", " § " and " coxalis ". 



Sweden ; so far known only from the type specimen. 

 Biology. Unknown. 



The FUMIPENNIS-Grovp 

 Gastrancistrus ? pyricola (Marchal) 



? Tridymus pyricola Marchal, 1907 : 20-23, $. 



Type material. Location not known to me. The original material was reared 

 from Contarinia pyrivora Riley (Dipt., Cecidomyiidae). In the BM(NH) there are 

 some specimens determined as pyricola by Dr. Ferriere ; in some respects they do 

 not agree completely with the original description, but the latter may be faulty. 

 I include the species here tentatively as Pyricola, on the basis of these specimens. 



? Britain ; France. 



Biology. Endoparasite of the larvae of Contarinia pyrivora Riley on pear-trees 

 (Marchal, 1907). The British specimens presumed to be pyricola were reared 

 (H. F. Barnes) from the same host, England : Kent, 1938, 1 <$ ', Norfolk, 6 <$, 1 $, 

 1936 ; Shropshire, near Oswestry, 3 J, 3 $, 1938. Wales, Caernarvonshire, 4 $, 

 3 9. 1937- 



Gastrancistrus fumipennis Walker 



Gastrancistrus futnipennis Walker, 1834 : 174, "<j?" [recte <$]. 



Type material. Three males in Walker collection (one of which may not be 

 original material). LECTOTYPE, the first specimen, bearing a Waterhouse label ; 

 the gaster is squashed and looks rather like that of a female, which would account 

 for Walker's having mistaken its sex. 



Britain ; uncommon ; near London (Walker) ; Buckinghamshire, Hell Coppice, 

 near Oakley, 2 $, 24. vi. 1958 (Graham). Imagines in June. 

 Biology. Unknown. 



Gastrancistrus cupreus sp. n. 



(Text-figs. 215, 219, 223) 



$. Head bronze ; face with greenish reflections, the frons mainly violet. Thorax and gaster 

 black with a slight bronze tinge ; mesoscutum, scutellum, dorsellum and propodeum coppery 



