List of the Insect Fauna of the Conntij. 



145 



in June, just before the catkins fall. Spathegastek baccarum, 

 Linne. (Fig. 42.) 



Fig. 43. Sixitlmi aster tricolor. 



Fig. 42. Spathecfaster haccarum. 



QuERcus RoBUR, L. Leaf. This gall resembles green 

 leaf-specimens of the former species 

 {S. haccarum) in every respect, ex- 

 cept that its surface is thickly 

 covered with fine, soft, whitish 

 hairs. The gall is mature in early 

 summer, and the gall-fly emerges 

 therefrom in July and August. 

 Spathegaster tricolor, Hartig. 

 (Fig. 43.) 



QuERcus EoBUR, L. Leaf. The 

 small gall of this species occurs at 

 the margin of the young leaf, 

 generally near its base. It is 

 smooth, oval, and yellowish, some- 

 what resembling a white mustard 

 seed, except in shape (which is 

 more oval). The gall, which is 

 single-celled and thin-walled, is 

 mature in spring, and the gall- ^..^^^ ^^ Spatlmimter aJhipes. 

 fly emerges therefrom in June. 

 Spathegaster albipes, Schenck. (Fig. 44.) 



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