462 M. W. R. de V. GRAHAM 



Callitula pyrrhogaster (Walker) 



Micromelus pyrrhogaster Walker, 1833 : 465, 6* $. 



Micromelus pyrrhogaster Walker ; Haliday, 1841-1842 : v, pi. E, fig. 2, $. 



Pteromalus mutilus Forster, 1841 : 29, 0* $. 



Micromelus pyrrhogaster Walker ; Reinhard, 1858 : 17. 



Merisus (Baeotomus) pyrrhogaster (Walker) Thomson, 1878 : 62. 



Callitula pyrrhogaster (Walker) Goodliffe, 1942 : 323. 



Callitula pyrrhogaster (Walker) ; Bou£ek, 1964 : 10, $ $. 



Type material. Micromelus pyrrhogaster Walker. Three specimens (one probably 

 not original material) stand under this name. LECTOTYPE, a female bearing a 

 label " 1046 ", also a Waterhouse label. 



Pteromalus mutilus Forster. I have not seen the types (which are presumably 

 in Naturhistorisches Museum, Vienna), but the description immediately suggests 

 that the species is the same as Pyrrhogaster, as already stated by Reinhard 

 (1858 : 17). 



Widely distributed in Europe. 



Biology. Reared in England from puparia of Oscinella frit (L.) (see Goodliffe, 

 1942 : 323) ; and from Mayetiola poae (Bosc) (Dipt., Cecidomyiidae) in Czechoslo- 

 vakia, according to Boucek (1964 : 10). 



C. pyrrhogaster so closely resembles bicolor that it has sometimes been thought 

 to be a form of it ; for example, Goodliffe (1942 : 323) mentions a suggestion by 

 Nixon that pyrrhogaster might represent merely a phase of bicolor. Earlier Kurdju- 

 mov (1914 : 2) had suggested the same possibility. However, at present there is 

 no definite proof of this idea. Females apparently hibernate, like those of 

 bicolor ; in January 1953 Mr. Gradwell found a female pyrrhogaster amongst grass 

 roots. Otherwise adults occur in the field most frequently from July until 

 October. 



PSILOCERA Walker 



Psilocera Walker, 1833 : 373. Type-species : Ps. obscura Walker, by monotypy. 



Metopon Walker, 1834 : 302. Type-species : M. atrum Walker, by monotypy. 



Eupsilocera Westwood, 1839 : 69 [n. n. for Psilocera Walker, supposedly pre-occupied]. 



Metopum Agassiz, 1846 : 670 [invalid emendation]. 



Dichalysis Forster, 1856 : 52, 56 [n. n. for Psilocera Walker, supposedly pre-occupied]. 



Metopum [sic] Walker ; Forster, 1856 : 64, 69. 



Metopon sgen. Metopon Walker ; Thomson, 1878 : 165-168. 



Psilocera Walker ; Ashmead, 1904 : 315 [ex parte]. 



Metapon [sic] Walker ; Ashmead, 1904 : 314 [ex parte]. 



Psilocera Walker ; Schmiedeknecht, 1909 : 311, 315 [q* only]. 



Metopon Walker ; Schmiedeknecht, 1909 : 310, 315 [ex parte]. 



Metapon [sic] Walker ; Kurdjumov, 1913 : 6. 



Psilocera Walker ; Nikol'skaya, 1952 : 222-223. 



PPsilocera Walker ; Peck, 1963 : 628-629, [ ex parte]. 



Psilocera Walker : Peck et al., 1964 : 54. 



Walker (1848: 113) synonymized his genera Psilocera and Metopon, and this 

 has been accepted by authors who had personal acquaintance with both sexes. 



