Galls caused by the larv2e of Gecidomyia veronicae 

 Bremi. 



on 



the terminal leaves of Veronica chamaedrys Linn. 



PLATE yi. 

 Synonymy of Insect. 



Cecidoviyia chamadrys Inch. 

 „ veroniccB Theobald. 



Habitat of the Germander Speedwell.— This ubiquitous 

 plant during spring and summer, with its bright blue 

 flowers, adds to the attractiveness of many a roadside, 

 hedge-bank, and waste place. 



The Gall is Formed by the two terminal leaves swelling 

 in a convex manner and uniting at their edges, enclosing 

 abortive leaves and the flower-stalks. 



Manner of Growth. — Seldom more than one on each plant. 



Colour. — The leaves are green, thickly covered with long 

 white hairs. 



Average Dimensions of a Mature Specimen. 



Height, 1 8 mm; breadth, 12 mm.; girth, 28 mm. 



May be sought during any month in the year. 



The Growth is complete by the end of September. 



The Typical Condition of the gall is multilarval. 



The Larv.^; pupate in the gall. The imagines emerge 

 during the spring. 



Doubtless many people who gather wild flowers along the 

 hedgerows have often seen these galls. By reason of their 

 whitish colour they are noticeable objects, and sometimes their 

 attractiveness is increased by the mid-rib and the bulbous part 

 of the affected leaves being suffused with purple. 



The gall is also figured by F. V. Theobald, " British Flies," 

 p. 71. 



213 



