674 M - w - R - °e V. GRAHAM 



Mesopolobus mayetiolae (Gahan) 



Eutelus mayetiolae Gahan, 1919a : 128, $ 9- 

 Amblymerus mayetiolae Gahan, 1933 : 65—67, $ $. 

 Mesopolobus mayetiolae (Gahan) v. Rosen, 1958 : 228. 

 Amblymerus mayetiolae (Gahan) ; Peck, 1963 : 661. 



Type material. Type $, U.S.A., California, Salinas, in U.S.N.M. (not seen by 

 the writer). 



North America. Von Rosen's statement (1957 : 228) that it has been recorded 

 from Russia was a mistake. There seems to be no reason, however, why it should 

 not eventually be found in Europe. 



Biology. Reared from Mayetiola destructor (Say) (Dipt., Cecidomyiidae) ; 

 Ceuthorhynchus assimilis Payk. (Col., Curculionidae) ; and Tetramesa sp. (Hym., 

 Eurytomidae) in Phalaris arundinacea L. (see Gahan, 1933 ; Peck, 1963). 



Mesopolobus dubius (Walker) 



Amblymerus dubius Walker, 1834 : 308, 9- 

 Amblymerus validus Walker, 1834 : 308, 9- 

 Amblymerus ruralis Walker, 1834 : 343, $, syn. n. 

 Amblymerus truncatellus Walker, 1834 : 344, 9- 

 Amblymerus fulvipennis Walker, 1834 : 344, 9- 

 Amblymerus trossulus Walker, 1834 : 350, 9- 

 Eutelus signatus Walker, 1834 : 357, $, syn. n. 

 Pteromalus pinguis Walker, 1835 : 490, 9- 

 Platymesopus dubius (Walker) Graham, 1957^ : 224-225. 

 Mesopolobus dubius (Walker) v. Rosen, 1958 : 221-222, <$ 9- 

 Mesopolobus dubius (Walker) ; v. Rosen, 1960a : 23-24, <J 9- 



Type material. For synonymy, and designation of lectotypes for most of the 

 species, see Graham (1957^ : 224-225). 



Amblymerus ruralis Walker. Syntypes, 2 $ ; LECTOTYPE, the first specimen, 

 bearing a Waterhouse label. 



Eutelus signatus Walker. Previously (1957^ : 225) I regarded this as a doubtful 

 species because neither of the two syntypes agreed with the description. The 

 latter, however, fits the male of Mesopolobus dubius (Walker) very well and I feel 

 confident in placing signatus as a synonym of that species. 



Mesopolobus dubius was redescribed by von Rosen (1958 : 221-222). 



Britain, Sweden ; probably widely distributed in Europe. 



Biology. Reared in England from galls of Cynips divisa Hartig, Neuroterus 

 quercusbaccarum (L.) f. lenticularis and Biorrhiza pallida (Oliv.) (see Askew, 19616 : 

 171, for host-list and detailed biological observations). Bivoltine : June, and 

 July-Sept, with some females passing the winter as adults and living until the 

 following April. 



