96 ANDRIOUS MARGIN ALIS. 



Adler says that the species is found exceptionally 

 on the leaves. 



The Synergus is facialis. 



The parasites are Torymus auratus and Olinx tri- 

 lineata, Mayr. 



Commonly distributed. 



12. Andricus margtnalis. 

 PL VIII, figs. 5 and 6, gall. 



Gynips marginalis, Schlechtendal, S. E. Z., 1870, 397; Mayr, 



Eichengallen, 52, pi. vi, fig. 76. 

 Aphilothrix marginalis, Adler, Zeits. f. wiss. Zool., xxxv, 208, 



pi. xi, fig. 21 ; Licht., Oyn., 68, pi. ii, 



fig. 21. 

 Andricus marginalis, Mayr, Europ. Cyn., 21. 



Not to be known from A. quadrilineatus in the imago state. 



Neither as regards the gall or insect is this to be known from 

 A. 4<-lineatus. I have no doubt that it is only Andricus quadrilineatus, 

 the galls of which, as already indicated, occur on the leaves, and we 

 know of other instances of the same species having galls in the catkins 

 and leaves. 



The gall of this species is found on the edge of the 

 leaf, its position there being indicated by an incision ; 

 or it may be placed at the top of the leaf on the mid- 

 rib, it being there also shown by an incurvation. It 

 is sessile, and in form it is very irregular, varying 

 from conical to roundish. The colour is green when 

 fresh, and may be marked with reddish. The surface 

 is smooth and glabrous, and is irregularly furrowed 

 longitudinally. When old it is dark brown or dark 

 whitish-yellow. 



The galls are found in May, in which month they 

 ripen, yielding the flies in the same month or in June. 

 Those galls which have been " stung " by inquilines 

 remain attached for a long time to the leaves. I have 

 bred Olinx trilineata from them. 



A common if somewhat local species. 



Continental distribution: Sweden, Germany, Austria. 



