Galls caused by the larva; of Aulax glechomae Htg. 



on 



the petioles of leaves of Glechoma hederacea Linn 



PLATE 109. 

 Synonymy of Insect. 



DiasUvplius glechomcB Schen. 



Liposthenus glechoma Foer. 



Aulax gleclwmce Mayr, Htg, Cameron, Thorns., Fitch. 

 Habitat of the Ground-ivy. — This creeping plant is very 



abundant in Britain, growing in waste places and on 



banks ; but its more favourite situations are the margins of 



woods and under hedges. 

 The Gall is formed by a rapid accumulation of vegetable 



tissue resulting from puncture made during oviposition 



by the parent insect. 

 Position. — On the stem, the petiole, and also the leaf 

 Manner of Growth. — Usually singly ; specimens, however, 



are not uncommon where two or three coalesce. 

 Colour. — Green, and green tinged with pink and red. Covered 



with long white hairs. 

 Average Dimensions of a Mature Specimen. 



Height, lO mm. ; girth, 30 mm. 

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



and September. 

 The Growth is complete by the end of August. 

 The Typical Condition of the gall is unilocular and uni- 



larval. 

 The Larva pupates in the gall. The imago emerges during 



May. 

 Parasites. — Torymus splendens, T. glec/wmco Foer., T. singulatus 



Nees., Eupelmus brachypterus Gin, Enrytoma rufipes Brisc. 



In no situation do the galls grow more luxuriantly than 

 amongst the grass and other herbage on the banks of lanes 

 and country roads. See also plate 75. 



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

 phagous Hymenoptera " (Ray Society), vol. iv., plate 10. 

 249 



