IOWA ACADEMY OF SCIENCE 



Psithrus latitarsus Morrill. 



MegacMLe wootoni caligaster Cockerell. 



Monurnetha albifrons Kirby. 



Uetes salieola geranii Cockerell. 



Colletes kineaidi Cockerell. 



Colletes — two unidentified species. 



Chelynia nitida Cress 



Andrena lewisii Cockerell. 



Halictus inconditus Cockerell (n. sp.) 



Halietus frasera? Cockerell (n. sp.) 



Halictus rasipkora? Cockerell. 



Halietus regis Cockerell (n. sp.) 



Odynerus sp. 



The latter two species of Halictus were collected from a dwarf 

 plant, about eight inches high, just above timber line. All of 

 the others are from larger plants at Tolland, which is one or 

 two thousand feet below timber line. 



A plant was covered with cheese cloth to determine whether 

 self pollination could occur without insects. Observations on 

 3 plant and on three average untreated ones were taken a 

 month later by Miss Helen Leonard. Unfortunately, the cov- 

 ered plant had become badly affected by aphids before the seeds 

 set. 



The following is the numerical result : 



Total Xo. of j No Ux - p EB c E >- T U>-. 



FXOWEBS j POLLINATED POLLINATED 



1. Covered plant 145 



2. Plant not covered 



3. Plant not covered 547 116 21 



4. Plant not covered 368 ' 81 22 



The evidence points pretty clearly to the fact that, while 

 pollination may occur without bees, it is much more effectively 

 done when their visits are permitted. 



Department of Botany, 

 Iowa State College. 



