PTEROMALIDAE OF N.W. EUROPE 311 



Gastrancistrus atropurpureus Walker 



Gastrancistrus atro-purpureus Walker, 1834 : 173, $. 

 Gastrancistrus vagans Walker, 1834 : 173, $ [nee Westwood, 1833]. 



Type material. Syntypes, 2 $• LECTOTYPE, the first, bearing a Waterhouse 

 label, also one in C. Ferriere's handwriting " Type C.F.". 



Britain, Sweden. In Britain it is common in mixed oakwood during the spring. 

 Biology. Unknown. Imagines April- June. 



Gastrancistrus viridis Walker 



(Text-fig. 259) 



Gastrancistrus viridus Walker, 1834 : x 73' ?• 

 Gastrancistrus Dry as Walker, 1 839 : 209, 9, syn. n. 



Type material. Gastrancistrus viridis Walker. LECTOTYPE $ in BM(NH), 

 bearing a Waterhouse label, also one in C. Ferriere's handwriting " Type C.F. ". 

 Walker stated (1834 : 173) that viridis was also taken by the Rev. G. T. Rudd, but 

 I cannot find any specimen so labelled in the Rudd collection. 



G. dryas Walker. One female, LECTOTYPE, bearing a Waterhouse label. 



Britain, France, Sweden. In England I have taken it frequently in rough 

 grassy fields and sometimes on flowers of Crataegus. 

 Biology. Unknown. Imagines May-June. 



Gastrancistrus torymiformis (Ratzeburg) 



Tridymus torymiformis Ratzeburg, 1852 : 226, $. 

 Gastrancistrus torymiformis (Ratzeburg) Reinhard, 1858 : 320. 



Type material. Holotype presumed lost. 



I refer to this species some females which resemble those of viridis Walker except 

 that they have the exserted portion of the ovipositor sheaths somewhat shorter. 

 Possibly they may be only a form of viridis, but for the present, it seems better to 

 regard them as distinct. 



Britain, Germany. 



Biology. Ratzeburg reared the holotype $ " aus Cecidomyia an Werftweiden " 

 [Salix cinerea L.]. On 30. iv. i960 I swept males and a female of the species I believe 

 to be torymiformis from foliage of the same species of willow at Wytham Wood, 

 Berkshire. 



Gastrancistrus amaboeus Walker 



(Text-figs. 254, 258) 

 Gastrancistrus Amaboeus Walker, 1848 : 105, 155, $. 



Type material. One female, LECTOTYPE, bearing a Waterhouse label. 



