PTEROMALIDAE OF N.W. EUROPE 107 



The males of Janssoniella need further study before a key can be provided. The 

 male of major has the antennal scape slightly expanded above the middle, with a 

 shiny elongate boss on its front edge, extending about half way down. The probable 

 male of ambigua has the scape hardly at all expanded, and a boss is not distinctly 

 developed. I am not sure if the true male of caudata has yet been recognized. 



Note. Hedqvist has recently described (1968, Ent. Tidskr., 89 : 57, 58) a new 

 species Jannsoniella intermedia, from material captured in Finland and Canada. I 

 have seen a $ paratype, which agrees with the type of caudata in antennal characters, 

 but is much larger, with a longer propodeum. It does not appear to be identical 

 with major but I cannot now compare it with the type of that species. 



Janssoniella major Kerrich 



Janssoniella major Kerrich, in Kerrich & Graham, 1957 : 305, $ <j>. 



Type material. Holotype $, Sweden, Sodermanland, Vasbyon, 24. vi. 1949 (A. 

 Jansson), in coll. A. Jansson. 



Sweden. 



Biology. Unknown. Imagines in June. 



Janssionella caudata Kerrich 



Janssoniella caudata Kerrich, in Kerrich & Graham, 1957 : 304, <$ $. 

 Janssoniella caudata Kerrich ; Ferriere & Kerrich, 1958 : 30. 



Type material. Holotype $, Sweden, Skane, Ringsjo, in coll. Thomson, Lund. 



Britain, Sweden, Germany, Czechoslovakia, Canada, U.S.A. 



Biology. Reared from Polyporus spp., including versicolor (L.) Fries, in Czecho- 

 slovakia and the U.S.A. (see Kerrich & Graham, 1957 : 304). Imagines June- 

 August in Europe; one recorded in U.S.A. for March. 



Janssoniella ambigua sp. n. 



Janssoniella caudata Kerrich, in Kerrich & Graham, 1957 : 304-305 [ex parte], $. 



$. Length 3-0 to 3-7 mm. 



Extremely close to the $ of caudata Kerrich, and differs from it only in its distinctly shorter 

 antennal flagellum, slightly shorter funicular segments and scape (see key to species). The 

 corresponding characters noted for caudata in my key are taken from the holotype $ ; this is a 

 small specimen, which might be expected to have relatively shorter funicular segments if it were 

 conspecific with ambigua sp.n., instead of having them longer. I therefore regard the specimens 

 here included under ambigua to be outside the range of variation of caudata. 



The shape of the head in $ Janssoniella varies somewhat, the relative depth of the scrobes 

 and of the occipital excavation being rendered deeper in some specimens by shrinkage of the 

 head. Therefore the difference in the shape of the head between caudata and major as given by 

 Kerrich (1957 : 304-305 and figs. 18, 21) may not be a reliable character. 



c?. Unknown. 



