718 M. W. R. de V. GRAHAM 



i $, 4.111.1951, amongst Typha (S. Shaw) ; Oxfordshire, Otmoor, i (J, i §, 20.viii.1955 

 (Graham) . 

 Biology. Unknown. All the above specimens were taken in marshy places. 



Trichomalus posticus (Walker) 



Eutelus posticus Walker, 1834 : 366, $. 



? Pteromalus Deudorix Walker, 1839 : 225, <J. 



? Pteromalus intestinarius Forster, 1841 : 17-18, <j>- 



? Pteromalus cristatus Forster, 1841 : 20, $. 



Pteromalus Sunides Walker, 1845 : 261, o* $. 



? Pteromalus Xanthe Walker, 1845 : 262, q\ 



Isocyrtus {Trichomalus) punctinucha Thomson, 1878 : 134, $ $. 



? Trichomalus cristatus (Forster) Nikol'skaya, 1937 : I2_I 3. [/^^a^fi]. 



Trichomalus posticus (Walker) Graham, 19566 : 247. 



Trichomalus punctinucha Thomson ; Delucchi & Graham, 1956 : 548, 554-555, ?. 



Type material. For designation of lectotypes for most Walker species, see 

 Graham (1956& : 247). 



Pteromalus deudorix Walker. Syntypes, 3 $. LECTOTYPE, the third specimen, 

 bearing a Waterhouse label ; it appears to be a male of posticus. 



Pteromalus intestinarius Forster. One female, LECTOTYPE, labelled " Collect. 

 G. Mayr " ; " Tr. intestinarius Forster Type " ; and (in Forster's handwriting) 

 " intestudinarius [sic] m." . I think it is probably conspecific with posticus (Walker). 



Pteromalus cristatus Forster. Types probably lost (see Delucchi & Graham, 

 1956 : 545). Meyer (1923 : 117) mentioned Ruschka's opinion that cristatus might 

 be the same as frontalis Thomson [=nanus (Walker)], but some features in Forster's 

 description of cristatus (" Beine rotlichgelb, Schenkel an der Basis griin . . . Lg. 1 

 1/4 Lin.") suggest rather that it might have been the same as posticus (Walker). 

 Four specimens in the BM(NH) determined as cristatus by Ruschka, are actually 

 posticus. The redescription of cristatus given by Nikol'skaya (1937), particularly the 

 large size (" 2-3 mm.") suggests that she had posticus before her, although her figure 

 of the male antenna is like that of nanus (Walker). Possibly the series from which 

 the redescription was made was a mixed one. 



Pteromalus xanthe Walker. One male, LECTOTYPE ; it is probably a male 

 of posticus. 



Isocyrtus (Trichomalus) punctinucha Thomson. Syntypes, 11 specimens. LECTO- 

 TYPE, a female labelled " Reft " [Reftera] and " punctinucha Ths ". 



The description of the female of punctinucha (Thomson) [= posticus (Walker)] 

 given by Delucchi and Graham (1956) did not take into account the variation of the 

 species. Therefore a redescription, based on the types and on fresh material 

 compared with them, is given here : 



?. Length 2-0-2-9 mm. Colour of head and thorax much as in nanus (Walker), but bright 

 green and coppery specimens are less frequent ; femora sometimes entirely testaceous, some- 

 times more or less infuscate ; tibiae usually testaceous, occasionally slightly darkened medially. 

 Basal cell of fore wing usually bare, occasionally with 1-2 isolated hairs in its distal part. 

 Gaster ovate, 1-6—1-9 times as long as broad, somewhat longer than the thorax, but at least 



