

) 



1917] 



ROBERTSON— FLOWERS AND INSECTS 



315 



Ma 



Mi 



forms 



TABLE V 



E# 



Flora 



Small bees, polyleges $ . . . 

 Large bees, polyleges 9 . . . 



Sphingidae 



Humming-bird (Trochilus) 



N ON -SOCIAL 





Social 





Ma 



Mi 



Total 



Ma 



Mi 



Pol 



Total 



30.2 



24.2 54.4 



18.7 



21-5 



5-2 



45-5 



5.0 



3°-4 



355 



n. 7 



43-6 



9.0 



64.4 



359 



13-4 



49-4 



3° 9 



15.8 



3-7 



5° -.5 



54. 5 



0.0 



54-5 



40.9 



45 



0.0 



45-4 



82.7 



3-4 



1 



62.2 



137 



0.0 



0.0 



13.7 



TOTAL 



437 

 2098 



1239 



22 



29 



The females of the short- tongued polylectic bees form 

 group of insects preferring non-social Mi. They are cred 



the 



origin 



of such flowers. The females of the 



ted with 

 tongued 

 r groups 



Ma. This is the largest flower class, originally 



modified by long-tongued 



The Sphingidae and Trochilus 



in some 



them. 



become 



order shown in table VI. 



TABLE VI 



Groups of insects 



Large bees, polyleges S 



Lepidoptera (ex. Sphingidae). 



Large bees, inquilines 



Small bees, polyleges S 



Prosopis 



Diptera 



Large bees, oligoleges 



Small bees, inquilines 2 



Small bees, oligoleges 



Coleoptera 



Hemiptera 



Lower Hymenoptera 



Small bees, inquilines 6 



Social 



62.1 



77-9 



79-3 

 80.4 



86.1 



86.3 



86.5 

 872 



88.6 



90.6 



93-8 



95 5 

 96.0 



Some female bees on their pollen vi 

 social flowers. Eighty-five species of 



tongued bees, with 



