842 M. W. R. de V. GRAHAM 



Sciences naturelles de Belgique, Brussels ; when he renamed the species as vitodurense, 

 however, he stated (19556 : 137) " Typus ($) in meiner Sammlung ". His original 

 material (of ferrierei) came from Germany (Laimbach, near Munich, 4-9. vii. 1950 

 and Bavaria, Spock, 25.vi.-18.viii.1950) and from Switzerland (Zurich Canton, 

 Seegraeben, v. 1950). 



Britain, Germany, Switzerland. 



Biology. According to Delucchi (1954), this species is a parasite of Leucopomyia 

 obscura Hal., Cremifania nigrocellulata Czerny and Leucopis griseola Fin., attacking 

 the puparia ; these three species are predators of the Balsam Woolly aphid, Adelges 

 (Dreyfusia) piceae (Ratzeburg). Delucchi (1954 : 244-246) has given a very 

 interesting account of the predator-parasite complex associated with this aphid. 

 Imagines of vitodurense have been taken in the field June-September. 



Pachyneuron aphidis (Bouche) 



Diplolepis Aphidis Bouche, 1834 : 170, $ $. 

 Pteromalus minutissimus Forster, 1841 : 28, <$. 

 Pachyneuron pruni (Forster MS.) Walker, 1850 : 128, 9. syn. n. 

 Pachyneuron aphidis (Bouche) Reinhard, 1859 : 195, <J $. 

 Pachyneuron aphidis (Bouche) ; Thomson, 1878 : 30, $ $. 

 Pachyneuron aphidis (Bouche) ; Szelenyi, 1942 : 99, 100, 101, $ ?. 

 Pachyneuron minutissimum (Forster) Delucchi, 19556 : 129, 137-139, 6* ?■ 

 Pachyneuron aphidis (Bouche) ; Boucek, 1961c : 12. 

 Pachyneuron aphidis (Bouche) ; Boucek, 1965c : 18. 



Type material. Diplolepis aphidis Bouche. Types probably no longer extant ; 

 although I have made enquiries I have failed to locate them. Delucchi (19556 : 125) 

 regarded aphidis as a " phantom species " ; but I am prepared to follow the 

 interpretation of Reinhard (1859) which is accepted by Dr. Boucek. 



Pteromalus minutissimus Forster. Lectotype <$ (not seen) in Naturhistorisches 

 Museum, Vienna, according to Delucchi (19556 : 138). I have examined some 

 other specimens so named by Forster. P. minutissimus was synonymized with 

 aphidis Bouche by Reinhard (1859 : x 95)- 



Pachyneuron pruni Walker. Walker described only the female. His collection 

 contains a male and a female, neither of which agrees well with the description. 

 However, in order to settle the name, I designate the female as LECTOTYPE ; it 

 is labelled " Named by F. Walker 1907-345 " and, in Walker's handwriting, " Pruni 

 Foerst.". 



Widely distributed in Europe. 



Biology. Szelenyi (1942 : 99) gave a list of the recorded hosts of aphidis, all of 

 them either aphid species or their parasites, chiefly Braconidae Aphidiinae, the 

 Chalcidoid Aphelinus mali Hald. recorded a few times. It has also been recorded 

 (Secretariat, etc., 1961 : 215, 230) under the name minutissimum (Forster) as a 

 parasite of Myzus persicae Sulz. and of Brevicoryne brassicae L. in Holland ; and 

 (Secretariat, etc., 1963 : 343, 372) as a parasite of Toxoptera aurantii Fonsc. in 



