Galls caused by the larvce of Aulax hieracii Schenck 

 the stems of Hieracium sylvaticum Sm. 



PLATE SS. 

 Synonymy of Insect. 



Cynips hieracii Bouche. 



Aulax sabaudi Htg. 



„ hieracii Schenck, Mayr, Cameron. 

 „ gj-atninis Cameron, Mayr. 

 Habitat of the Wood Hawkweed.— Grows in open places 



in woods, on hedge-banks and old walls, also in meadows ; 



very common throughout Britain. 

 The Galls are mostly ovid or pyriform in shape. 

 Position. — On the roots and the stem usually near the flower- 

 head. 

 Manner of Growth.— Seldom more than one gall on a 



plant. 

 Colour. — Green, sometimes tinged with red, and very 



pubescent. 

 Average Dimensions of a Mature Specimen. 



Length, 25 mm. ; breadth, 17 mm. ; girth, 40 mm. ' 

 May be sought during the months of June, July, and August. 

 The Growth is complete by the end of August. 

 The Typical Condition of the gall is plurilocular. Usual 



number of cells, 20. 

 The Larv/E pupate in the gall. The imagines emerge during 



the spring. If one of these galls be cut open during the 



winter, the larval chamber will be found to contain both 



larvje and pupje. 

 Parasites. — Torynms hieracii Mayr, T. chlorinus Foer., T. 



euchloris Bohm., Eurytoma signatus Nees., Systole castani- 



vctitris Gir., and others. 



The gall is also figured by Peter Cameron, " British Phyto- 

 phagous Hymenoptera " (Ray Society), vol. iv., plate 9. 

 105 



