396 



THE CANAbiA.N ENTOMOLOGIST. 



the per cent, of all genera in the several regions from that denoting the 

 apically dehiscent genera, and so representing the relative abundance 

 of the latter in plus or minus quantities, as in table G. 



Table G. 

 All Types. Relative Abundance. 



h.f 



The conclusions to be drawn from I hesq figures seem clear and unmi^.- 

 ^"'dikabie. 



Dalla Torre's Catalogus Hymenopterorum renders the large task of 

 tabulating the distribution of the 137 genera of the Apid?e, and for com- 

 parison with them the 2,407 genera of Hymenoptera, including the Apidae, 

 relatively easy of accomplishment. The distribution of the insects is 

 tabulated according to the same regions as the plants, merely for the 

 purpose of direct comparison, and does not imply any taxonomic reasons 

 for such an arrangement of the material. The distribution of the 137 

 genera of Apida; is represented in table 11, and that of the 2,407 genera 

 of Hymenoptera in Table I. 



