PTEROMALIDAE OF N.W. EUROPE 669 



The female of heterotomus is extremely close to those of mediterraneus (Mayr) 

 and diffinis (Walker) . When examining the lectotype female of heterotomus selected 

 by Jansson, I thought it was probably the same as diffinis. Von Rosen (1958 : 229), 

 however, considers that it is the same as mediterraneus. 



Sweden. 



Biology. Unknown. 



Mesopolobus diffinis (Walker) 

 (Text-figs. 534, 536) 



Amblymevus latus Walker, 1834 : 343, $. 



Amblymerus pusillus Walker, 1834 : 347, $. 



Amblymerus fulvipes Walker, 1834 : 348, 9- 



Amblymerus linearis Walker, 1834 : 348, $. 



Amblymerus stenomerus Walker, 1834 : 350, $. 



Eutelus pygmeus Walker, 1834 : 358, <$. 



Eutelus diffinis Walker, 1834 : 358, $. 



Eutelus vagans Walker, 1834 : 369, $. 



Pteromalus exilis Walker, 1836 : 487, 9. 



Pteromalus Aenicus Walker, 1846 : 38 [n. n. ?]. 



Pteromalus Leuce Walker, 1848 : 127, 214, $. 



Platymesopus diffinis (Walker) Graham, 19570" : 226-227. 



Mesopolobus diffinis (Walker) v. Rosen, 1958 : 229-230, $ $. 



Mesopolobus diffinis (Walker) ; v. Rosen, 1960a : 23, o* $• 



Mesopolobus diffinis (Walker) ; v. Rosen, 1961 : 118, o* 9- 



Type material. For synonymy and designation of lectotypes see Graham 

 (1957^) ; in that paper the name diffinis was adopted for the species although some 

 of the other names have page priority. The species was redescribed by von Rosen 

 (1958 : 229-230). 



Britain, Ireland, Denmark, Sweden, Moldavian S.S.R. In Britain it appears 

 to be rather local, occurring mainly in rough grassland habitats ; on several occasions 

 it has been found on the sea coast. 



Biology. Reared in Denmark from galls of Misospatha tubifex (Bouch6) on 

 Artemisia campestris L. according to von Rosen (1961 : 118). Barnes (1939 1505) 

 recorded it (under the name Eutelus diffinis) as having been reared in England from 

 galls of Diarthronomyia chrysanthemi Ahlberg, the Chrysanthemum-midge. This 

 midge was apparently introduced into Europe from North America with imported 

 plants and cannot be the chief host of diffinis. I have not seen Barnes's specimens 

 of diffinis and so cannot be sure if the identification is correct. Imagines Aug. -Sept. 

 in Britain, earlier in some parts of the Continent. 



Mesopolobus aspilus (Walker) 



(Text-figs. 527, 542) 



Pteromalus aspilus Walker, 1835a : 485, $. 

 Eutelus elongatus Thomson, 1878 : 75, $, syn. n. 



