PTEROMALIDAE OF N.W. EUROPE 701 



Mandibles reddish with darker teeth. Coxea concolorous with thorax ; legs otherwise testa- 

 ceous, tips of tarsi brownish. Tegulae testaceous ; wings subhyaline, veins testaceous. 

 Length 17 mm. 



Differs from the female of inermis Boucek in the characters given in my key to species. 



<J. Unknown. 



Holotype $. England : Berkshire, Wytham, 2.1X.1951, swept from vegetation 

 at the edge of a Phalaris-Glyceria maxima marsh between Wytham Wood and the 

 River Thames (Graham), in Graham collection. 



Biology. Unknown. 



PERIDESMIA Forster 



Peridesmia Forster, 1856 : 65. Type-species : Isocyrtus (Trichomalas) aquisgranensis Mayr, 

 1903, by designation of Gahan, 1923 : 408. 



Peridesmia Forster 

 Peridesmia Forster 

 Peridesmia Forster 

 Peridesmia Forster 



Mayr, 1903 : 394-395- 

 Delucchi, 19556 : 147-150. 

 Graham, 19566 : 246. 

 Peck et at., 1964 : 53. 



Key to European Species 



(Females) 



1 Propodeum, medially, about two thirds as long as the scutellum, with a large rect- 

 angular nucha which is strongly reticulate, like the panels of the media area ; 

 the nucha is separated from the median area by a groove but its front edge is not 

 sharply-defined. Front edge of pronotal collar not very abrupt but tending to be 

 somewhat rounded off ; the collar itself is much less wide than the mesoscutum. 

 Eyes separated by hardly more than their own length. . congrua (Walker) (p. 702) 



- Propodeum, medially, only about half as long as the scutellum ; nucha represented 



only by a very short subtriangular area which is very weakly sculptured, tending 

 to be transversely aciculate, and has its front edge rather sharply-defined. Front 

 edge of pronotal collar more abrupt ; the collar itself nearly as wide as the meso- 

 scutum. Eyes separated by fully 1-5 times their own length discus (Walker) (p. 701) 



(Males) 



1 Eyes larger, separated by about 12 times their length. Propodeum and pronotal 

 collar as in female. Smooth shiny band of temple narrow, extending up the 

 middle of the temple and leaving a reticulate strip on either side ; the smooth 

 bands reach almost to the posterior ocelli (Text-fig. 574). Antennae bright testa- 

 ceous with at most the clava and pedicellus slightly brownish congrua (Walker) (p. 702) 



- Eyes smaller, separated by 1-6-1-65 times their length. Propodeum and pronotal 



collar as in female. Smooth band of temple broader, leaving only a narrow 

 reticulate strip along the hind edge of the temple, its upper end touching the 

 posterior orbit of the eye ; the smooth bands reach hardly to the level of the top 

 of the eyes and therefore do not nearly reach the posterior ocelli. Antennal 

 pedicellus and flagellum brown to blackish . . . discus (Walker) (p. 701) 



Peridesmia discus (Walker) 



Pteromalus discus Walker, 1835 : 482, $. 



Pteromalus subquadratus Walker, 1836 : 478, " $ " \recte <$~\. 



