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EXPLANATION OF PLATES. 



PLATE XI. 



Fig. 1. Urophora solstitialis. Female, x5; ovipositor partially extended. 



Fig. 2. Vertical section through young flower bud of Ceniaurea nigra, showing eggs Ov. 



of U. solstitialis in, situ. 24 hours after oviposition. x 9. 

 Fig. 3. A. Ungalled receptacle of C. nigra. x 2. 

 B. Galled 



