PTEROMALIDAE OF N.W. EUROPE 295 



Paratypes. Same data as holotype, 5 $ ; West Inverness, Isle of Rhum, 2 $, 

 21.vi.1963 (Graham). England : Berkshire, Wytham Wood, 1 $, 25.V.1959 

 (Graham), Bagley Wood, 1 $, 4.VL1954, beaten from foliage of Larix decidua Mill 

 (Graham), in Graham collection. 



Biology. Unknown. 



Gastrancistrus unicolor Walker 

 (Text-figs. 216, 220) 



Gastrancistrus unicolor Walker, 1834 : 175, $. 



Tridymus frenalis Thomson, 1876a : 199, $ [nee $], syn. n. 



Type material. Gastrancistrus unicolor Walker. Syntypes, 4 <$. LECTOTYPE, 

 the first specimen, bearing a Waterhouse label. 



Tridymus frenalis Thomson. Five specimens, male and female ; the females 

 disagree with the description and belong to puncticollis (Thomson). LECTOTYPE, 

 a male labelled " Esp " [Esperod] and " <$ ". 



Britain, Sweden ; uncommon. 



Biology. Unknown. Imagines May- June. 



Gastrancistrus obscurellus Walker 



Gastrancistrus obscurellus Walker, 1834 : 175,6*- 



Type material. One male, designated LECTOTYPE (possibly it is holotype), 

 bearing a Waterhouse label. I cannot definitely associate this male with any 

 female known to me, so that it may well represent a valid species. No other 

 specimen except the type has been seen. 



England : " June ; on grass beneath trees ; near London " (Walker, 1834 : 175). 

 Biology. Unknown. 



Species sola 



Gastrancistrus acutus Walker 



(Text-fig. 228) 



Gastrancistrus angulus Walker, 1834 : 177, 6* ?, syn. n. 

 Gastrancistrus acutus Walker, 1834 : 177, $. 

 Gastrancistrus Panares Walker, 1844a : 339, $, syn. n. 

 Gastrancistrus Loelianus Walker, 1848 : 105, 160, $, syn. n. 

 Tridymus acutus (Walker) ; Thomson, 1876a : 200, $. 



Type material. Gastrancistrus angulus Walker. Syntypes, 2 $. LECTOTYPE, 

 the first specimen, bearing Waterhouse label, also one " Type C.F." [C. Ferriere]. 



G. acutus Walker. Syntypes, 7 $. LECTOTYPE, the fifth, with Waterhouse 

 label. 



