PTEROMALIDAE OF N.VV. EUROPE 663 



but the rest have about the basal half of the fore and mid femora, and the basal two 

 thirds of the hind femora, brownish. The gaster is 2-4-2-85 times as long as broad. 

 The pronotal collar is indistinctly margined, and the mesoscutum in some of the 

 specimens is flattened. The structure of the hypopygium (Text-fig. 553) agrees 

 with that shown in von Rosen's photomicrograph of pseudolaticornis. 



These British specimens differ recognizably from my British females of laticornis, 

 particularly in the shape of the hypopygium. It is more difficult to be sure whether 

 they are really different from teliformis or clavicornis, however. They have the 

 femora paler than in typical examples of the former, darker than in females of the 

 latter. Their hypopygia do not differ very much from those of teliformis which I 

 have dissected, nor from those of clavicornis. I am willing to regard pseudolaticornis 

 provisionally as a distinct species, but further investigation is desirable. 



Britain, Sweden. 



Biology. The type material was reared from seeds of Festuca arundinacea 

 Schreb. by von Rosen, who suggested that it was not impossible (though unlikely) 

 that the species is phytophagous and produces more than one brood per annum. 

 He also (1966 : 80) reared, from Dactylis glomerata L., some specimens which he 

 considered might belong to the same species. 



Mesopolobus graminum (Hardh) 



Amblymerus graminum Hardh, 1950 : 88, $ [nee $]. 

 A mblymerus graminum Hardh ; v. Rosen, 1956 : 18. 

 Platymesopus graminum (Hardh) Graham, 19570" : 229. 

 Mesopolobus graminum (Hardh) v. Rosen, 1958 : 215-216, ^ ?. 

 Mesopolobus graminum (Hardh) ; v. Rosen, i960 : 25-28, <$ J. 

 Mesopolobus graminum (Hardh) ; v. Rosen, 1960a : 26, $ $. 



Type material. Lectotype £ designated by von Rosen (1956 : 18) who synony- 

 mized the species with Eutelus elongatus Thomson ; but this synonymy was later 

 corrected and graminum shown to be a valid species (Graham, 1957^ : 228-229). 

 The female syntype of graminum belongs to a different species {aequus Walker) . 



Britain, Denmark, Sweden, Finland, U.S.S.R. 



Biology. An account was given by von Rosen (i960 : 25-28). In Sweden he 

 found graminum living as a predator on eggs of Calligypona [=Delphacodes~] pellucida 

 (F.) (Hemipt., Delphacidae) in grass culms ; also parasitizing larvae of the 

 Eurytomid species Eurytoma suecica v. Rosen and Tetramesa angustipennis (Walker), 

 and their parasites Pedobius eubius (Walker) and Chlorocytus pulchripes (Walker) ; 

 he also reared it from galls of Tetramesa hyalipennis (Walker) and T. linearis 

 (Walker) on Agropyron repens. He recorded an interesting case where a few 

 specimens of graminum were reared from galls of the Cynipid Trigonaspis synaspis 

 (Hartig) on an oak-seedling hardly half a metre in height, growing amongst tall 

 grasses. In Britain graminum has been reared from cells of Tetramesa calama- 

 grostidis (Hed.) by Claridge (see Graham, 1957^). Imagines chiefly June-July 

 (some specimens in May and August in Britain). 



