484 IOWA ACADEMY OF SCIENCE 



bees are as numerous on these clover fields of the mountains as 

 one "would expect to find them on a field of red clover at ordi- 

 nary altitudes. Sometimes a dozen could be seen in a walk of 

 a hundred feet. 



Trifolium nanum is a dwarf plant coming into bloom in 

 earliest summer. On it "were found:. 



Bombus kirbyellus Curtis. Numerous. 



Bombus edwardsii bifarius Cresson. Numerous. 



Bombus (a small species). 



Trifolium dasypliyllum is a larger plant and blooms a little 

 later. Its visitors are 



Bombus kirbyellus Curtis. Numerous. 



Bombus edwardsii bifarius. Cresson. 



Bombus appositus Cresson. 



Bombus flavifrons Cresson. 



Prosopis eoloradensis Cockerell. 



Osmia kenoyeri Cockerell (n sp.). 



A blue butterfly. 



Perhaps next in importance is Polemonium confertum, a plant 

 contrasting in its erectness to the caespitose vegetation, so 

 abundant on the mountains, and bearing a conspicuous cluster 

 of dark purple blossoms with a inusky odor. It is visited by 



Bombus kirbyellus Curtis. 



Halictus rasiphora? Cresson. 

 also numerous flies, among which are species of Eristalis and 

 the Anthomyinea?. 



Mcrtensiu bakeri is another bee flower. Its guests include 



Bombus edwardsii bifarius Cresson. 



Bombus flavifrons Cresson. 



Eristalis sp. among the flies. 



Silene acaulis, the well-known Mountain Pink. w 7 as visited by 



Bombus edwardsii bifarius Cresson. 



A small gray bee. 



Melittia (a butterfly). 



A moth. 



H. Midler in the European Alps found this plant visited pre- 

 vailingly by Lepidoptera. L. H. Pammel found Lepidoptera 

 abundant on the same plant in the Medicine Bow region of our 

 Rockies. 



