834 M. W. R. de V. GRAHAM 



pedicellus, varying from slightly transverse to very slightly longer than 

 broad. 



$ clypeus, Text-fig. 678 ..... concolor (Forster) (p. 840) 



Pachyneuron aeneum Masi 



Pachnyeuron aeneum Masi, 1929 : 229, $. 

 Atrichoptilus aeneus (Masi) Delucchi, 19556 : 141-142. 

 Pachyneuron aeneum. Masi ; Bou£ek, 1965*? : 16-18, q" $>• 



Type material. Holotype $, North Africa, Libya, Oasis of Giarabub, iii.1927, 

 in Museo Civico di Storia Naturale, Genoa (not seen). 



Delucchi (1955& : 141-142) mentioned some characters by which he considered 

 aeneum to differ from the other species of Pachyneuron, and erected the genus 

 Atrichoptilus on the basis of these characters. Boucek re-examined the type 

 of aeneum as well as additional material, and consequently was able to form a 

 more satisfactory concept of the variation of the species ; he concluded (1965c : 18) 

 that the main character used by Delucchi for separating Atrichoptilus from 

 Pachyneuron was too variable to be of value. Consequently he referred aeneum 

 once more to Pachyneuron ; at the same time he redescribed the species 

 (1965c : 16-18). 



Europe (Moldavian S.S.R.) ; Turkey ; Libya. 



Biology. Boucek (1965c : 18) stated that aeneum had been reared in Moldavia 

 from Syrphid puparia found amongst aphids (" Yezabura reaumuri ", presumably 

 Patchiella reaumuri (Kalt.)). Imagines chiefly July-August (some records for 

 March and April). 



Pachyneuron planiscuta Thomson 



Pachyneuron planiscuta Thomson, 1878 : 29, o* ?• 



Pachyneuron planiscuta Thomson ; Szelenyi, 1942 : 100, 101, <$ $. 



Pachyneuron planiscuta Thomson ; Delucchi, 19556 : 126, 129-130, o* ?• 



Type material. Syntypes, 3 <$, 2 $. LECTOTYPE : the lowermost of two 

 males which are mounted on the same pin and labelled " Hma " [Holmeja]. 



Ireland, Sweden, Hungary, Moldavian S.S.R. The species appears to be 

 associated with Phragmites ; in Sweden I captured many specimens in a reed-bed 

 at Yddingen, very near to Holmeja (the type-locality). Imagines June-August. 



Biology. Unknown. 



Pachyneuron umbratum Delucchi 



(Text-figs. 683, 684) 



? Pachyneuron coeruleum Delucchi, 19556 : 127, 131-132, o* ?. 

 Pachyneuron umbratum Delucchi, 19556 : 127-128, 132-133, <J ?■ 

 Pachyneuron umbratum Delucchi ; Boucek, 1965^ : 8, 18. 



Type material. Pachyneuron coeruleum Delucchi. Type $, and paratypes, 



