PTEROMALIDAE OF N.W. EUROPE 671 



Type material. Holotype and allotype, Sweden, Uppland, Solna, reared from 

 galls of Oligotrophia juniperinns (L.), in Universitetets Zoologiska Institution, Lund. 



Denmark, Sweden, eastern Europe. 



Biology. Reared from galls of Oligotrophia juniperinus (L.) on Juniperus 

 (von Rosen). Imagines in June and August. 



Mesopolobus ? semiclavatus (Ratzeburg) 

 (Text-fig. 530) 



? Pteromalus semiclavatus Ratzeburg, 1848 : 202, <$, ? 9- 



Type material. Presumed destroyed. 



A few years ago Mr. von Rosen kindly sent me from Sweden both sexes of a 

 species which he had named semiclavatus Ratzeburg. Later, however, he told me 

 that he was not sure if his specimens were really semiclavatus. In my opinion they 

 agree quite well with Ratzeburg's description (this author described both sexes, 

 but was not sure whether the single $ he possessed was conspecific with his <$). 

 Hence I am using the name semiclavatus as possibly the correct one. 



Britain : Scotland, West Inverness, Arisaig, from a Betula-Salix aurita association, 

 2 <$, 1 $, 2.VH.1961 (Graham). Sweden : Skane, Falsterbo, <^ and 9» 22.vii.1963 

 (v. Rosen). 



Biology. Unknown. 



Mesopolobus longicollis sp. n. 



(Text-figs. 529, 532, 543) 



$. Body green, sometimes with golden reflections ; gaster bronze-black discally, some of 

 the tergites occasionally with blue or violet flecks. Antennae testaceous ; pedicellus proxim- 

 ally, and some of the proximal funicular segments, sometimes a little infuscate. Coxae 

 concolorous with the thorax, legs otherwise yellowish or testaceous with the femora usually in- 

 fuscate at least proximally, sometimes mainly so, the tips of the tarsi fuscous, occasionally 

 some or all of the tibiae slightly infuscate medially. Tegulae yellow, usually slightly infuscate 

 posteriorly. Wings hyaline ; venation pale yellow. Length 1-4 to i-8 mm. 



Head 2-1 to 2-15 times as broad as mesoscutum ; in dorsal view 1 -9 to 2 times as broad as long, 

 with temples rounded off and slightly more than one third as long as eyes ; POL 1 -9 to 2 times 

 OOL. Head in front view suboval with the genae slightly buccate. Eyes separated by about 

 1-2 times their length. Malar space slightly less than half the length of an eye. Breadth of 

 oral fossa 2 to 2-25 times the malar space. Clypeus strigose-reticulate, its anterior margin 

 rather shallowly emarginate, with a slight impression just above the emargination. Head 

 moderately finely reticulate, more finely on face, genae, and middle of vertex. Antennae 

 (Text-fig. 543) inserted low on head, lower edge of toruli at or hardly above level of ventral 

 edge of eyes ; scape almost as long as an eye, reaching lower edge of median ocellus ; combined 

 length of pedicellus and flagellum hardly less than breadth of head ; pedicellus (profile) about 

 twice as long as broad, about as long as anelli plus half the first funicular segment, or slightly 

 less than this ; flagellum rather weakly clavate, proximally as stout as or slightly stouter than 

 the pedicellus ; first and second anelli short, twice or rather more than twice as broad as long, 

 third anellus longer and about 1 -5 times as broad as long ; funicular segments subquadrate, 



