1929] 
Oligolectic Bees and Favorite Flowers 
117 
ends 21 days before its Compositae, 153 days, June 1-Oct. 31. 
M. trinodis, 91 days, begins 19 days after and ends 25 days 
before its Compositae, 135 days, June 19-Oct. 31. M. agilis , 
98 days, begins 13 days before and ends 15 days after its 
Compositae, 100 days, July 24-Oct. 31. M. coloradensis , 62 
days, begins 56 days after and ends 15 days before its 
Compositae, 133 days, June 10-Oct. 30. M. simillima, 66 days, 
begins 24 days after and ends 10 days before its Compo- 
sitae, 100 days, July 24-Oct. 31. M. autumnalis, 58 days, 
begins 33 days after and ends 9 days before its Compositae, 
100 days, July 24-Oct. 31. Epimelissodes illinoensis, 29 days, 
begins 27 days after and ends 34 days before its Heliantheae, 
90 days, June 19-Sept. 16. Anthedon compta, 76 days, begins 
5 days before and ends 18 days before Oenothera biennis , 
89 days, July 20-Oct. 16. Only two Euceridae get pollen 
from the same flowers. 
Cucurbita oligoleges. Cucurbita pepo blooms 94 days, 
July 4-Oct. 4. One of its oligoleges, Peponapis pruinosa, 77 
days, begins 11 days after and ends 6 days before, while the 
other, Xenoglossa strenua, 62 days, begins 25 days after 
and ends 7 days before. 
Ipomoea oligoleges. Ipomcea blooms 125 days, June 24- 
Oct. 26. One of its oligoleges, Cemolobus ipomoex, 80 days, 
begins 9 days before and ends 54 days before. The other, 
Melitoma taurea , 103 days, begins 3 days after and ends 
19 days before. 
Cassia oligoleges. Cassia chamxcrista blooms 100 days, 
June 28-Oct. 5. One of its oligoleges, Epimelissodes atripes, 
36 days, begins 37 days after and ends 27 days before. The 
other, Amegilla walshii, 77 days, begins 8 days after and 
ends 15 days before. 
Emphor bombiformis, 44 days, begins 10 days after and 
ends 5 days before Hibiscus lasiocarpus, 59 days, July 20- 
Sept. 16. 
Other Cases. 
Physalis oligoleges. Colletes willistonii , and C. latitarsis 
fly 101 and 108 days, bearing some relation to Physalis, 
which blooms 147 days, but Zaperdita maura flies 59 days, 
