PTEROMALIDAE OF N.W. EUROPE 767 



Merisus intermedins var. microptera Lindeman. Location of original material not 

 known. Gahan (1933 : 87-88) mentioned that the U.S.N.M. possessed 5 <J and 1 $ 

 labelled " Merisus intermedins var. micropterus Lindeman " ; Howard had assured 

 him that these specimens had been received from Lindeman himself, and that the 

 label was in Lindeman's handwriting. Howard believed that they were part of the 

 original material. I follow Gahan as first reviser of the species. If no further 

 material is discovered, a lectotype might be selected from that in the U.S.N.M. 



Baeotomns coxalis Ashmead. Syntypes, France, 1 $ and 4 <J, in U.S.N.M. ; they 

 were compared with the above specimens of Merisus intermedins var. microptera by 

 Gahan, who declared them to be identical (1933 : 88). 



Eupteromalus arvensis Kurdjumov. Location of syntypes (U.S.S.R. : Poltava, 

 Moscow, Kiev) not known, possibly in Leningrad. Gahan (1933 : 88) considered that 

 his available material of micropterus (Lindeman) agreed completely with the 

 description of arvensis, which he therefore put in synonymy. I agree with Gahan's 

 opinion. 



$. Extremely close to that of peregrinus sp. n., but differs as follows : head in dorsal view 

 (Text-fig. 616) rather more transverse, 2-2-2-35 times as broad as long and 1-2-1-25 times as 

 broad as the mesoscutum ; antennal scape a little longer, 0-9-0-95 the length of an eye, reaching 

 or virtually reaching the level of the vertex ; proximal segments of funicle sometimes a little 

 longer than broad ; median carina of propodeum weak or absent ; antennal scape fuscous with 

 its base, or at most its basal half, testaceous ; femora and tibiae usually testaceous, the femora 

 sometimes slightly infuscate. 



o*. Kurdjumov, when describing arvensis (now regarded as a synonym of micropterus) stated 

 that males with fully-developed wings exist. I have seen only the brachypterous form ; 

 apart from the shortened wings, this is extremely close to the male of peregrinus sp. n., but has 

 the combined length of pedicellus and flagellum about equal to the breadth of the head ; it is 

 also very close to the male of hemipterns (Walker) but seems to have a slightly more transverse 

 head, with the temples rather less rounded ; the funicular segments tend to be a little longer. 

 Additional material of micropterus is desirable in order to study its range of variation. 



? Britain ; France, U.S.S.R. In U.S.N.M. are some specimens labelled as 

 having come from Ohio, U.S.A.; but Gahan (1933 : 88) suspected that an error 

 might have been made in labelling, and that these specimens may have come from 

 Europe. Miss Ormerod (1887 : 317) recorded specimens of Merisus intermedins var. 

 micropterus from Scotland, which had been reared from puparia of the Hessian fly 

 and identified by Lindeman himself. I cannot locate these specimens and so am 

 unable to check the record ; I have seen no other British specimens. 



Biology. Parasite of Diptera Cecidomyiidae, e.g., Mayetiola destructor (Say) 

 (Lindeman, Ashmead, Kurdjumov) and M. avenae (Marchal) (Marchal, 1897). I 

 have examined specimens reared from the former host in the U.S.S.R. Nikol'skaya 

 (1935 : n) mentioned that it had been obtained in 1924, at Poltava, U.S.S.R., from 

 seeds of lucerne. Details of its biology are apparently unknown. 



Eupteromalus tigasis (Walker) 



(Text-fig. 617) 



Pteromalus Tigasis Walker, 1839 : 233, o*- 

 Eupteromalus tigasis (Walker) Graham, 19565 : 255, q*- 



