62 Annals Entomological Society of America [Vol. IV, 



ence in the European Rosaceae, especially marked in Spiraea 

 with its 2 genera and 5 species, contrasting strongly with our 

 8 genera representing 11 species. A still greater difference is 

 found in the Vitaceae, the European Vitis supporting but 2 

 genera and 2 species, while our American vines afford sustenance 

 to 12 genera represented by 15 species. The European fauna 

 of the Compositae is also much less, namely some 67 species 

 representing 10 genera as compared with our 118 species assign- 

 able to 15 genera. This large discrepancy is accounted for in 

 great part by the enormous fauna of the Solidago and the num- 

 erous species occurring upon aster; plant genera which in Europe 

 support only one genus and one species. 



