394 



THE CANADIAN ENTOMOLOGIST. 



Except for minor differences, the distribution of the 152 genera of 

 the Melastomataceous type, all but three of which belong to the type 

 family, is very similar to that of the Solanum-Cassia type. 



Table E. 

 Genera of the Melastomataceous Type. 



This type is confined to eight of the fourteen regions. Over 63 per 

 cent, are found exclusively in the tropical American region. The distribu- 

 tion of the species has not been figured in detail, but about 73 per cent, 

 are tropical American, and the remaining 27 per cent, are almost 

 exclusively confined to the tropical African and Indian regions. 



Aside from a comparison by species, which is at the present moment 

 impracticable^ a summation of the distribution of the genera of all types 

 in comparison with the total number of genera of flowering plants will 

 furnish the most satisfactory test of the hypothesis of the greater local 

 differentiation of certain floral types. Table F makes clear the distribu- 

 tion of the 227 apically dehiscent genera of all three types. 



