Galls caused by the larvae of Cecidomyia ranunculi 

 Bremi. 



on 



the leaves of Ranunculus repens Linn. 



PLATE Si. 



Synonymy of Insect. 



Cecidovtyia ranunculi Fitch. 



Habitat of the Creeping Ranunculus.— Very abundant 

 in Britain by roadsides, damp spots in and near woods, in 

 meadows and pastures, and waste places generally. 



The Gall is formed by the two outer segments of the leaf 

 having their edges rolled upwards and inwards until they 

 meet above the mid-vein. 



Manner of Growth.— Singly ; pubescent ; inflexible. 



Colour. — Same slijide of green as a normal leaf 



Average Dimensions of a Mature Specimen. 



Length, 25 mm.; breadth, 12 mm.; girth, 30 mm. 



May be sought during the months of July to November. 



The Growth is complete by the end of September. 



The Typical Condition of the gall is unilarval. 



The Larva pupates in the gall. The imago emerges 

 during the spring. 



The two side .segments first show signs of being galled, and 

 after they have rolled up and met each other, the central 

 segment enfolds them, and a firm and compact mass of leaf is 

 the result. The veins become thickened and wrinkled, very 

 pubescent, and of a slightly paler colour than normal. 



The gall is also figured by E. A. Fitch, " The Entomologist," 

 July, 1880. 



The illustration is of specimens gathered at Hastings by 

 the author. 



