PTEROMALIDAE OF N.W. EUROPE 93 



proposed a new subfamily Panstenoninae, in which he included Panstenon Walker 

 and Neodipara Erdos. The latter genus has no connexion with Panstenon and must 

 be excluded from the present subfamily. 



Caudonia was described by Walker without his placing it in any of the recognized 

 subfamilies, although he remarked that it was " allied to Trigonoderus, Heteroxys 

 and Notanisus " . Forster (1856 : 47) included it in his key to the genera of 

 Cleonymoidae, although he had not seen the genus. Later Walker (1872 : 80) 

 accepted this view without comment. The genus remained in Cleonymidae until 

 1957, when Graham synonymized it with Panstenon Walker. 



Key to European Species 



1 Eyes smaller ; malar space from two thirds, to nearly three quarters, the length of an 

 eye. Pronotal collar sharply margined anteriorly ; notauli, and f renal line of 

 scutellum strongly impressed. Gaster of female usually convex dorsally and usually 

 with at least some trace of a red band in the middle ; petiole with one to two hairs on 

 each side .......... agylla (Walker) (p. 93) 



- Eyes larger ; malar space about two fifths the length of an eye. Pronotal collar 

 weakly margined, or immarginate ; notauli tending to be less strongly impressed ; 

 frenal line of scutellum fine and weak. Gaster of female usually sunken dorsally, 

 rarely red-marked dorsally though sometimes red beneath in the basal half ; petiole 

 without hairs. Body of <j>. Text-fig. 55 . . . oxylus (Walker) (p. 94) 



Panstenon agylla (Walker) 



Caudonia Agylla Walker, 1850 : 125, ?. 



Panstenon agylla (Walker) Graham, in Kerrich & Graham, 1957 : 276-280, $. 



Panstenon agylla (Walker) ; Boucek, 1961 : 71-72, J ?• 



Type material. Holotype $, Scotland, Duddingston Loch, near Edinburgh, 

 between June 27 and June 30, 1825 (/. C. Dale) in Hope Dept., Oxford ; it is 

 gummed on an octagonal card and bears a printed label " Dale ". 



Britain, Czechoslovakia ; apparently very local and rare. 



Biology. Unknown. Boucek (1961 : 72) suggested that it might be parasitic on 

 some host living in a species of marsh grass. I believe it might be associated with 

 Phragmites in old fens. On 9th June 1963 I captured a female amongst Phragmites 

 at Wood Walton Fen, Huntingdonshire (a relict of ancient fen). There are also 

 large reed-beds at the edge of Duddingston Loch, where Dale took the holotype of 

 agylla ; I looked for the latter in these reeds some years ago, but the weather was 

 bad and I had no success. Imagines found in Britain in June, in Czechoslovakia in 

 August (Boucek, 1961). Cameron (1935 : 300) recorded having reared agylla from 

 puparia of Agromyza [= Melanagromyza) aeneiventris (Fin.) found in stems of 

 Senecio jacobaea L. in several localities to the west of London ; the specimens appear 

 to be lost, but it seems likely that the parasite was wrongly determined (see Kerrich 

 & Graham, 1957 : 277). 



