296 M. W. R. de V. GRAHAM 



G. panares Walker. One female, LECTOTYPE, with Waterhouse label. It is 

 an unusually large robust acutus. 



G. loelianus Walker. One female, LECTOTYPE, with Waterhouse label, also 

 " Type C.F." [C. Ferriere). 



Since Thomson (1875 : 200) has already used the name acutus, I propose, under 

 the First Reviser principle, to continue with this usage, although the name angulus 

 has line priority. 



Britain, Sweden to Lapland. Uncommon ; I have found it both in rough 

 pastures and meadows and on sand-dune vegetation. The <§ is unknown to me. 

 Biology. Unknown. Imagines June-July. 



Species sola 



Gastrancistrus clavatus (Thomson) 



(Text-fig. 231) 



? Gastrancistrus Fulginas Walker, 1839a : 85, $. 

 Tridymus clavatus Thomson, 1876a : 199, $. 

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



Type material. Gastrancistrus fulginas Walker. One female was found standing 

 above a label " Pteromalus Felginas W. 1842 " ; it is labelled " Felginas " in 

 Walker's handwriting. It disagrees with the description of Pteromalus felginas and 

 could not be the type of that species. However, it fits very well the description of 

 Gastrancistrus fulginas and could well be its type. I believe that it is in fact the 

 type of fulginas and that there has been a mistake in labelling. This idea seems to 

 be confirmed by evidence in the old B.M. register of accessions, where there is the 

 entry " Gastrancistrus Fulginas Chiloe " ; the name has originally been written as 

 Felginas but altered to Fulginas. G. fulginas (type locality : Chiloe) is so like 

 clavatus (Thomson) that I cannot at present distinguish them ; but in view of their 

 widely different provenance it appears safer to use the Thomson name for our 

 European species. 



Tridymus clavatus Thomson. Syntypes, 7 specimens. LECTOTYPE, a female 

 labelled " Hbg " [Halsingborg] and " clavatus " ; the specimen remounted by A. 

 Jansson. 



Britain, Sweden ; ? Chile. New record : England, Berkshire, Thatcham 

 Reeds, near Newbury, several $?> 17.viii.1g66, swept from inflorescences of 

 Artemisia vulgaris L. (Graham). 



Biology. Unknown. Imagines July-August. 



The HAMILLUS-Grovp 

 Gastrancistrus hamillus Walker 



(Text-fig. 249) 



Gastrancistrus Hamillus Walker, 1848 : 105, 156, $. 

 Tridymus flavipes Thomson, 1876a : 195, $, syn. n. 



