PTEROMALIDAE OF N.W. EUROPE 673 



the middle ; whilst the antennal clava is shorter and broader, rather less than twice 

 as long as broad ; also they have the pronotal collar at least slightly longer than in 

 longicollis. 



Biology. Unknown. 



Mesopolobus typographi (Ruschka) 



Eutelus typographi Ruschka, 1924 : 13-14, 6" $. 



Mesopolobus typographi (Ruschka), v. Rosen, 1960a : 38, q* <j>. 



Type material. Syntypes (not seen by the writer) in the Hochschule fur Boden- 

 kultur and Naturhistorisches Museum, Vienna ; in Swedish Forestry Academy, and 

 in coll. Ruschka. 



Central and North-western Europe (not yet found in Britain). 



Biology. Ectoparasite of Tomicobia seitneri (Ruschka), henCe hyperparasite of 

 ips typographus L. and other species of Ips (see Sachtleben, 1952 : 175-179). 



M. typographi has been redescribed by von Rosen (1960a) who pointed out how it 

 differs from elongatus, with which he had incorrectly synonymized it (1958 : 216). 



Mesopolobus citrinus (Ratzeburg) 



Pteromalus citrinus Ratzeburg, 1848 : 248, o" ?• 



Mesopolobus citrinus (Ratzeburg) v. Rosen, 1959 : 136-139, $ $. 



Mesopolobus citrinus (Ratzeburg) ; v. Rosen, 1960a : 23, $. 



Type material. Presumed destroyed. The original description is very short, but 

 mentions that the species was reared from Lasioptera [=Helicomyia] saliciperda. 

 Von Rosen found a series in Vienna, reared from Helicomyia saliciperda (Duf.), 

 which agreed with Ratzeburg's description ; he designated these specimens as 

 neotypes of citrinus. He selected two of them as type $ and allotype <$, marking 

 them with red tickets ; they are labelled " C. saliciperda, Eisgrub 1916, Fulmek, 

 E. citrinus Ratz., det. Ruschka ". The same author (1958) gave a detailed 

 redescription of the species. 



Britain, Germany, Austria, Sweden (Lapland) ; ? Italy. New to Britain, 

 Oxfordshire, Otmoor, 8.ix.i956, $ swept from foliage of Salix fragilis L. {Graham). 



Biology. Reared from Helicomyia saliciperda (Duf.) (Dipt., Cecidomyiidae) by 

 Ruschka (see above). Von Rosen thought that the " Eutelus sp. " reared in Italy 

 from Rhabdophaga saliciperda by Cecconi (1912 : 328) was probably citrinus. 



Mesopolobus sp. indet. A 



England : Berkshire, Wytham, 1 $, 24. v. 196 1 (Graham). This seems to be near 

 citrinus. 



Mesopolobus sp. indet. B 

 Ireland : Co. Down, Sliddery Ford, 1 $, 22.viii.1957 (Stelfox). 



