Aphilotrix quadrilineata. 91 



I allowed them to remain for several days. In May 

 the commencement of gall growth was visible, and 

 the Aphilotrix marginalis galls were fully grown by 

 May 30, while the Aphilotrix semiftationis galls were 

 then only visible as little hairy knobs : the much 

 earlier development of the Aphilotrix marginalis gall 

 which enables it to arrive at maturity two or three 

 weeks sooner than that of Aphilotrix seminationis, 

 serves as a certain distinction between the two galls. 



[The marginal gall is found in May on Querciis sessiliflora. 

 Parasite. Olinx tyilineata.^ 



22. Aphilotrix quadrilineata. Htg.^ 

 Gall. In shape the gall is oval, sometimes almost 

 round ; it is smooth or irregularly furrowed and ridged, 

 of a green or reddish colour: it springs usually from 

 the stalk of the flowering catkin, but, exceptionally, 

 from the leaves; it appears in May and matures in 

 June. (Fig. 22.) This gall is so like the last that it 

 cannot be distinguished with certainty from it, and it is 

 possibly identical with it. The Aphilotrix quadrilineata 

 gall grows both from the leaves and flowering catkins 

 in the same way as the Aphilotrix marginalis and 

 seminationis galls. Notwithstanding that this gall is 

 very abundant it is by no means an easy thing to rear 

 the fly. From the majority of the galls parasites are 

 usually obtained ; then the larva in a large number of 



[' Andricus quadrilineatus, Hartig. Cynips quadrilineatus, Thorns. 

 Andriciis Jlavicornis, A. pednnculi, A. ambigiius, A. verrucosus, 

 A. glabriusculus, Schenck. The specific name quadrilineatus was 

 given to it when it belonged to the genus Andricus, and hence it 

 occurs frequently as Aphilotrix: quadrilineatus, instead of quadri- 

 lineata.^ 



