PTEROMALIDAE OF N.W. EUROPE 625 



this name, but the male was not described. LECTOTYPE, the female specimen, 

 bearing a Waterhouse label. 



Chrysolampus contractus Nees. Type material lost. Placed in synonymy with 

 laetus (Walker) by Boucek (1961 : 72) ; this synonymy seems reasonable and is 

 followed here. It is supported by a manuscript note in Walker's annotated copy of 

 his List of Hymenopterous Insects in the British Museum (part 1, 1846) ; on page 34 

 he has written against Isocyrtus laetus " = Chrysolampus contractus" . As the 

 Nees collection was for some years on loan to Westwood, the latter may have 

 informed Walker of the synonymy. 



Kodysia tibialis Boucek. Holotype $, Western Moravia, Hodice at Jihlava, 

 7.vi.i953 (Kodys), in Narodni Museum, Prague (Cat. no. 3013). 



Britain, Czechoslovakia, Moldavian S.S.R. 



Biology. Unknown ; the species occurs in grassy situations and is probably 

 associated with some host on Gramineae. Imagines May- June in England and 

 Czechoslovakia ; into July in Scotland. 



PSILONO TUS Walker 



Psilonotus Walker, 1834 : 168, 179. Type-species : Ps. adamas Walker, by monotypy. 



Psilonotus Walker; Forster, 1856 : 60, 62. 



Eutelus sgen. Psilonotus Walker ; Thomson, 1878 : 70, 81-83. 



Psilonotus Walker ; Ashmead, 1904 : 317. 



Psilonotus Walker ; Schmiedeknecht, 1909 : 322, 324. 



Psilonotus Walker ; Kurdjumov, 1913 : 4. 



Psilonotus Walker ; Nikol'skaya, 1952 : 224. 



Janvartsovia Nikol'skaya, 1954 : 412. Type-species : /. betulae Nikol'skaya, by monotypy and 



original designation. 

 Psilonotus Walker ; Graham, 1957^ : 230-232. 

 Janvartsovia Nikol'skaya ; Graham, 1958 : 120. 

 Psilonotus Walker ; Peck et al., 1964 : 52. 



The genus Janvartsovia was synonymized with Psilonotus by Graham (1958 : 120). 

 In my earlier paper (1957^ : 231-232) I stated that none of the types of Walker's 

 Psilonotus species could be found. Since then I have located all of them ; some 

 had been placed (probably by J. Waterston) in a drawer apart from the main 

 collection of the BM(NH), whilst another was found in Haliday's collection in 

 Dublin. The synonymy can therefore be completed and the species objectively 

 defined. 



All the species occur on Betula spp. 



Key to European Species 



(Males and Females) 



1 Both sexes with pronotum (Text-fig. 511) longer ; the collar longer medially, 



not distinctly margined in front, but almost rounded off into the pronotal 

 neck, which does not slope vertically; antenna (Text-fig. 512) with combined 

 length of pedicellus and flagellum at most equal to breadth of head, scape 

 relatively broad, flagellum relatively more clavate, distal segments of funicle 



