PTEROMALIDAE OF N.W. EUROPE 425 



Fore wing with postmarginal vein at most about i-6 times as long as the 

 stigmal vein ; speculum, on upper surface of wing, extending below the 

 marginal vein nearly or quite to the stigmal vein. Base of gaster not or 

 only indistinctly yellowish ......... 2 



Antenna with combined length of pedicellus and fiagellum 1-4 to i-6 times 

 breadth of head ; funicular segments relatively longer, the first i-6 to i-8, 

 sixth 1 -3 to 1 -7 times, as long as broad. Anterior margin of clypeus slightly 

 produced ...... xylophagorum (Ratzeburg) (p. 425) 



Antenna with combined length of pedicellus and fiagellum only slightly greater 

 than breadth of head ; funicular segments relatively shorter, subquadrate 

 or only slightly longer than broad. Anterior margin of clypeus virtually 

 truncate ....... brevicornis Thomson (p. 426) 



Roptrocerus mirus (Walker) 



Amblymerus mivus Walker, 1834 : 351, $. 



Roptrocerus mirus (Walker) Thomson, 1878 : 84-85, $. 



Pachyceras janssoni Hedqvist, 1955 : 84-85, ?. 



Roptrocerus mirus (Walker) ; Hedqvist, 1963 : 61, 62-63, $ ?. 



Type material. Amblymerus mirus Walker. One female, designated LECTO- 

 TYPE (possibly holotype), lacking the head, bearing a Waterhouse label " Ptero- 

 malus mirus ". 



Pachyceras janssoni Hedqvist. Holotype $, Sweden, Ostergotland, Simonstorp, 

 1-4. viii. 1955, in coll. Hedqvist. Placed in synonymy with mirus (Walker) by 

 Hedqvist (1963 : 62). 



Britain, Sweden. 



Biology. Parasite of Coleoptera Scolytidae. Reared in Britain from Myelophilus 

 (=Blastophagus) piniperda (L.) according to Hanson (1940 : 505) ; and in Sweden 

 from Ips typographies L. by Hedqvist (1963). The records for mirus in the paper by 

 Gyorfi (1952) need checking as it is not certain whether he identified the species 

 correctly. Imagines appear in August. 



Roptrocerus xylophagorum (Ratzeburg) 



Pachyceras Xylophagorum Ratzeburg, 1844a : 218, $. 



Pachyceras Eccoptogastri Ratzeburg, 1844a : 218, $. 



Roptrocerus Xylophagorum (Ratzeburg) Ratzeburg, 1848 : 209, pi. 3, fig. 2. 



Roptrocerus rectus Provancher, 1887 : 202, ?. 



Platygerrhus ? scolyti Ashmead, 18946 : 335, ?, ? 6*- 



Roptrocerus xylophagorum (Ratzeburg) ; Hedqvist, 1963 : 61, 62, 66-70, q" $. 



Type material Pachyceras xylophagorum Ratzeburg. Type presumed destroyed. 



Pachyceras eccoptogastri Ratzeburg. Types presumed destroyed. The species 

 was placed in synonymy with xylophagorum by Hedqvist (1963 : 66). 



Roptrocerus rectus Provancher. Lectotype (Canada, Quebec, Cap Rouge) in 

 Museum of the Province of Quebec, designated by Gahan and Rohwer (1918 : 171) ; 

 it. is stated to bear a yellow label with the number 1386. The species was placed in 



