PTEROMALIDAE OF N.W. EUROPE 419 



Metacolus unifasciatus Forster 



Metacolus i-fasciatus Forster, 1856 : 70, <J ? [sine descr.]. 

 Metacolus unifasciatus Thomson, 1878 : 36, <J $. 

 Metacolus unifasciatus Thomson ; Mercet, 1926 : 43-45, 47. 

 Metacolus unifasciatus Thomson ; Ferriere, 1948 : 529-530, $ $. 

 Metacolus unifasciatus Thomson ; Hedqvist, 1963 : 97-99, c? $. 



The name unifasciatus Forster is presumably validated by Forster's description of 

 the genus (1856 : 65). This would be an "indication", according to the International 

 Code of Zoological Nomenclature (1961), in which one form of indication is defined 

 (Art. 16 (a) vi) as " a single combined description of a new nominal genus and a new 

 nominal species, which provides an indication for each name ". I have not seen the 

 types of unifasciatus, although I have examined Thomson's specimens. 



Britain, Sweden, Norway, Finland, U.S.S.R., Czechoslovakia, Istria, 

 Spain. 



Biology. Parasite of Blastophagus minor Htg., ips acuminatus Gyll., Pityogenes 

 quadridens Htg. ; other hosts are also mentioned in the literature (see Hedqvist, 1963 : 

 99). Hedqvist states that in Sweden there is only one generation per annum. The 

 species has been taken in the field June-August. 



Metacolus azureus (Ratzeburg) comb. n. 



Pteromalus azureus Ratzeburg, 1844a : 203, <$ [? nee <j>]. 



Pteromalus azureus Ratzeburg, 1848 : 191, o* $. 



? Pteromalus azurescens Ratzeburg, 1852 : 235, <J. 



Pterosema varicolor Forster, 1878 : 44-45, $, syn. n. 



Metacolus aulloi Mercet, 1926 : 45-47, $, syn. n. 



Metacolus aulloi Mercet ; Ferriere, 1948 : 530, $. 



Metacolus varicolor (Forster) Boucek, 1957& : 76. 



Metacolus varicolor (Forster) ; Hedqvist, 1963 : 97, 100-102, q* $. 



Type material. Pteromalus azureus Ratzeburg. Types presumed destroyed. 

 This species was placed in Rhopalicus as a synonym of brevicornis Thomson, by 

 Kurdjumov (1913 : 10) but Ratzeburg's description does not agree with the male of 

 that species. It does, however, agree very well with the male of Metacolus varicolor 

 (Forster), especially Ratzeburg's amplified description of 1848. 



Pteromalus azurescens Ratzeburg. Types presumed destroyed. 



Pterosema varicolor Forster. This species was not recognized until Boucek (19576 : 

 76) transferred it to the genus Metacolus and remarked that it might be conspecific 

 with aulloi Mercet. I have not seen the type of varicolor, which is presumably in 

 Naturhistorisches Museum, Vienna, but I think Boucek's opinion is correct. 



Metacolus aulloi Mercet. Type $ (not seen), Spain, Province of Avila, Pinares 

 Llanos, presumably in Instituto Espanol de Entomologia, Madrid. 



Sweden, Norway, Finland, Germany, Poland, Czechoslovakia, Jugoslavia, 

 Spain. 



Biology. Parasite of Pityogenes bidentatus Herbst and P. quadridens Htg. (on 

 biology see Hedqvist, 1963 : 102). Imagines in spring and early summer. 



