PTEROMALIDAE OF N.W. EUROPE 795 



Arthrolytus maculipennis was redescribed in detail by Gahan (1933). His 

 description and figure (17C) of the male antenna, particularly the form of the scape 

 and his statement (p. 73) that the antennal club is not differentiated, as well as some 

 points in his description of the female, show that he had before him the true 

 maculipennis. It is true that he synonymized A. punctatus Thomson with maculi- 

 pennis, but he did not see the syntypes of punctatus, some of which (but not the 

 lectotype) are in fact the same as maculipennis. 



Britain, France, Sweden, Germany ; probably widely distributed in Europe, 

 but I have not checked any specimens from countries other than those mentioned. 

 In Britain I find it most often in damp meadows and marshy places. 



Biology. Reared in France, under the names Holcaeus cecidomyiae Ashmead and 

 Homoporus laniger, from the Cecidomyiid species Mayetiola (—Phytophaga) destructor 

 (Say) and M. {=P.) avenae (Marchal) ; see Marchal, 1897! Gahan (1933 : 75) 

 remarked that, in view of the apparent abundance and wide distribution of 

 maculipennis and the fact that it had been recorded only once as a parasite of these 

 common pests, it seemed hardly likely that either of them was the normal host. 

 No doubt this will prove to be the case. Imagines May-Sept. 



Arthrolytus (Arthrolytus) discoideus (Nees) comb. n. 

 (Text-fig. 653) 



Pteromalus discoideus Nees, 1834 : 119, $. 

 Pteromalus Artembares Walker, 1839 : 257, q\ syn. n. 

 Arthrolytus punctatus Thomson, 1878 : 158, $, syn. n. 



Type material. Pteromalus discoideus Nees. LECTOTYPE, a female in coll. 

 Westwood (Oxford), e coll. Nees, bearing a small pink square label numbered 

 " 7 ", also labelled in Westwood's handwriting " Pteromalus discoideus Esenb. 2. 

 119. E Mus. Esenb.". 



Pteromalus artembares Walker. Syntypes, 2 <$. One bearing a Waterhouse label, 

 is selected as LECTOTYPE. 



Arthrolytus punctatus Thomson. Syntypes, several specimens. LECTOTYPE, 

 a female labelled " Lp in " [Lapponia inferioris] ; " Bhn " [Boheman] ; " 14/G " ; 

 " punctatus Ths " ; and " TYPE " (on a red label). 



Britain, Sweden, Germany ; probably widely distributed in Europe. 

 Biology. Unknown. Imagines Aug.-Sept. 



Arthrolytus (Arthrolytus) megaspilus (Walker) comb. n. 



Pteromalus megaspilus Walker, 1874 : 318, $. 



Type material. Syntypes, 2 $. LECTOTYPE, Hym. 5. 728, bearing a red- 

 bordered type label and also labelled " 142 ", " Amurland. Coll. F. Walker 

 1913-71 ", and, in Walker's handwriting, " Pteromalus megaspilus ". 



Asia (Amurland). 

 Biology. Unknown. 



