292 UNIVERSITY OF COLORADO STUDIES 



carrying the pollen, those of the family Andrenidae visiting the 

 flowers most often. Other insects, such as beetles, flies, ants and 

 plant bugs are also present, but are probably of little use in pollina- 

 tion. Spiders may be found catching the insects which aUght on the 

 flower. 



The following insects and arachnids were found by one of us, and 

 determinations kindly made by Professor T. D. A. Cockerell: 



April 19, 1906 

 Apis mellifera Z,., four 

 Andrena nigrihirta Ashmead, 2 females 

 Spider (family Thomisidae) 



April 23, 1906 



Bombomelecta fulvida Cresson 



Apis mellifera L. 



Beetle (Anthrenus scrophulariae) 



Ant (Formica) 



Spider (family Attidae) 



Fly (family Syrphidae) 



Beetle 



Plant bugs 



April 25, 1906 

 Andrena bridwelli Cockerell, two females 

 Andrena carlini Cockerell, male 

 Fly (Sjo-phidae) 

 Plant bug 

 Halictus cooleyi Crawford, i female 



May I, 1906 



Nomada subrutila Lovell and Cockerell 



Andrena nigrihirta Ashmead, i male 



Halictus pilosus Smith, variety, i female 



Ant (Formica) 



Fly (Syrphidae) 



Plant bug 



Halictus 



Andrena bridwelli Cockerell, i female 



May 2, 1906 

 Andrena prunorum Cockerell 

 Agapostemon texanus Cresson 

 Halictus cooleyi Crawford 

 Plant bug 



