List of the Insect Fauna of the Countij. 



127 



plainly visible on both sides. It is multilocular, but the 

 larva3 leave the gall and pupate in the earth. Hormomyia 

 CoRNi, Giraud. 



Stellate. 



Galium verum, L. Stem. Smooth, shining, somewhat 

 hard, pink or whitish swellings of the stem ; single galls are 

 generally more or less round, but several galls mostly occur 

 together. The stem itself is not further distorted ; occasionally 

 the galls occur on the flower- stalks. The orange larvae leave 

 the gall and pupate in the earth. Cecidomyia Galii, H. 

 Loew. 



CoMPOSITiE. 



Achillea Millefolium, L. Leai' 

 axils. These are cup-like, thickened, 

 greenish, or purplish brown, swell- 

 ings occurring singly or in pairs in 

 the axils of the leaves ; the tops of 

 the galls are irregularly coronate, 

 and the larvae emerge thence and 

 pupate in the earth. Hormomyia 

 MiLLEFOLii, H. Loew. (Fig. 11). 



Tanacetum vulgare, L. Leaf, 

 stem, flower. The single gall is 

 smooth, green, bell-shaped or ovate, with a notched crown 

 at the apex ; it opens here when mature. The walls 

 are thick and fleshy, and each gall contains but one larva ; 

 frequently, however, two or more coalesce, and occasionally 

 the stem is completely surrounded with the confluent fleshy 

 galls. The galls mostly occur singly on the midribs and 

 piiniffi of the leaves, or several together in the axils of the 

 leaves, or as a terminal bunch on young plants ; more rarely 

 seven or eight galls may be found on the receptacle of the 

 flowers, these generally purple and green in colour. The 

 bright orange larvae pupate in the earth, but frequently 

 also in the galls. Oligotrophus (Hormomyia) Tanaceticolus, 

 Karsch, or possibly only a variety of H. Millefolii, H. 

 Loew. 



Fig. 11. 

 Hormomyia Millefolii. 



