PTEROMALIDAE OF N.W. EUROPE 119 



that his view was incorrect and that gravenhorstii may have been a Platygerrhus. Of 

 the species of that genus, the description seems to fit affmis best. 



Platygerrhus millenius Szczepanski. Holotype $, Poland, Hajnowka County, 

 Bialowieza National Park, 31.viii.195g, in coll. Szczepanski ; allotype J, same locality, 

 8.ix.i95g, in Forest Entomology Section of Central Agricultural College, Warsaw. 

 Thanks to the kindness of Dr. Szczepanski, I have been able to examine the holotype ; 

 it may fall within the limits of variation of affmis (but see below). 



I refer to the entity now being discussed as affmis aggregate, since it contains two 

 forms which might be distinct species. The aggregate comes very close to ductilis 

 (Walker) but may be distinguished as follows : 



$. Hypopygium extending nearly or quite half way along the gaster ; the latter on the aver- 

 age shorter than in ductilis, especially in large specimens, only as long as head plus thorax in some 

 specimens, but up to 1 4 times as long in occasional smaller ones. Malar space relatively 

 shorter (length of eye 2-3 to 3 times the malar space, as against 2-05 to 2-2 times in ductilis). 

 Basal cell of fore wing with fewer hairs, usually only one row below the submarginal vein, two 

 rows in large specimens ; lower margin of stigma less evenly and strongly curved, sometimes 

 nearly straight in the middle, the stigma more oblong in shape, usually subcircular in ductilis. 



There is considerable variation within the limits of the a^m's-aggregate. P. 

 millenius Szczepanski falls within these limits and may be a form of affmis, the 

 differences between them being only very small and possibly inconstant. Females 

 of the aggregate, however, seem to fall into two groups : (1) affmis s. str., with gaster 

 2-2-2-8 times as long as broad, (2) millenius with gaster 3-4 times as long as broad. 

 There is considerable variation in the length of the malar space, but no correlation 

 between this and the relative length of the gaster appears to exist. The range of 

 variation in the ratio of length to breadth of the gaster seems rather great for a single 

 species, for which reason I treat millenius as a doubtful synonym of affmis. Further 

 research is needed to show whether these two forms are specifically distinct or not. 



The males which I have associated with affmis differ from those of ductilis only in 

 a few very small characters (see key to males) . 



Britain, Sweden, Czechoslovakia, Poland. 



Biology. The specimens reared in England from Anobium punctatum DeG (0. W. 

 Richards), and referred to as ductilis f. affmis by Kerrich & Graham (1957 : 301) 

 belong here. In Britain I have captured imagines of f. affmis from August to 

 November ; those of f . millenius in May, June and August. 



The DOLOS US-Grovp 



Females have the characters of the propodeum and metapleuron as in the ductilis- 

 group, from which they differ in having the funicular segments relatively short, the 

 malar space relatively longer, and the legs darker. Males differ from those of the 

 ductilis-gvoup in having the hairs of the antennal flagellum more or less outstanding. 



