PTEROMALIDAE OF N.W. EUROPE 627 



edge of eyes (Text-fig. 514) ; combined length of pedicellus and flagellum 

 not greater than breadth of head ; flagellum less slender with distal segments 

 of funicle slightly transverse ; scutellum moderately convex, slightly longer 

 than broad. Male with antennae inserted slightly above the level of the 

 ventral edge of the eyes ..... hortensia Walker (p. 628) 



Psilonotus adamas Walker 



(Text-figs. 510-512) 



Psilonotus Adamas Walker, 1834 : 179, $. 



Psilonotus Adamas Walker ; Haliday, 1841-1842 : v, pi. B, fig. 2, $. 



Psilonotus catuli Forster, 1856 : 62, 9. 



Eutelus {Psilonotus) aureolus Thomson, 1878 : 82, $. 



Janvartsovia betulae Nikol'skaya, 1954 : 413, 6* $• 



Psilonotus adamas Walker ; Graham, 1957^ : 2 3°> 2 3 2 > 6* ?• 



Psilonotus adamas Walker ; Graham, 1958 : 120. 



Type material. Psilonotus adamas Walker. Syntypes, 2 $ ; LECTOTYPE, the 

 second, bearing a Waterhouse label. It agrees with my earlier interpretation 

 (1957^ : 230, 231) of the species. 



Psilonotus catuli Forster. Syntypes, a mixed series in Forster coll., Vienna. 

 Lectotype $ designated by von Rosen (1958 : 237) ; it is labelled " Frankf. 

 Birkenkatzchen " and marked with a red ticket. 



Eutelus (Psilonotus) aureolus Thomson. Lectotype $ designated by Graham 

 (1957^ : 230). 



Janvartsovia betulae Nikol'skaya. Syntypes, 1 $ and 3 J, Russia, Yanvartsevo, 

 near R. Ural, 2.viii.i95o, reared (A. V. Vyrshikovskaya), in Zoological Museum, 

 Leningrad. The species was placed in synonymy with Psilonotus adamas Walker 

 by Graham (1958 : 120). 



Britain, Sweden, Germany, U.S.S.R. 



Biology. Reared from seeds of Betula, which bore gall-like swellings and were 

 infested by the Cecidomyiid fly Semudobia betulae Winn., in U.S.S.R. (Nikol'skaya, 

 1954). Earlier Mayr (1903 : 387, footnote) recorded having reared Psilonotus 

 catuli Forster from birch catkins deformed by the above Cecidomyiid. Imagines 

 June- Aug. (one record for Oct.). 



Psilonotus achaeus Walker 

 (Text-fig. 513) 



Psilonotus Achaeus Walker, 1848 : 105, 161, $. 

 Pteromalus Cyamon Walker, 1848 : 123, 176, $. 

 Psilonotus viridulus Thomson, 1878 : 83, $. 

 Psilonotus achaeus Walker ; Graham, 1957^ : 231, 232, $ $. 



Type material. Psilonotus achaeus Walker. One female, LECTOTYPE bearing 

 a Waterhouse label, was found in BM(NH). 



Pteromalus cyamon Walker and Psilonotus viridulus Thomson. Lectotypes 

 designated by Graham (1957^ : 231). 



