114 
Psyche 
[June 
after Salix begins and 76 days before it ends. All of them 
complete their flight 46 days before Salix ends. Andrena sa- 
licis, 47 days, begins with Salix and ends 101 days sooner. 
Parandrena andrenoides begins 3 days later and ends 67 
days sooner. Trachandrena marise shows 8 days later and 
86 earlier. Andrena illincensis shows 8 and 81, salictaria 14 
and 46, erythrogastra 26 and 76. Of these equally common 
species, 3 average 26 days shorter than the other 3, while 
the Andrenid oligoleges, as stated above, in general average 
only 7.7 days shorter than the polyleges. 
Other vernal species. Ptilandrena erigenise, 50 days, be- 
gins 10 days after and ends 10 days before Claytonia vir- 
ginica, 70 days, March 16-May 24. P. polemonii, 37 days, 
begins 2 days after and ends 4 days before Polemonium rep- 
tans , 43 days, April 12-May 24. P. g. maculati, 24 days, be- 
gins 18 days after and ends 11 days before Geranium macu- 
latum, 53 days, April 13- June 4. Pterandrena krigiana, 35 
days, begins 11 days after and ends 4 days before Krigia 
amplexicaulis , 50 days, May 1-June 19. Trachandrena spirse- 
ana, 13 days, begins 6 days after and ends 9 days before 
Aruncus Sylvester , 28 days, May 24- June 20. lomelissa vi- 
olas, 51 days, begins 13 days after and ends 20 days before 
Viola , 84 days, March 17- June 8. Andrena arabis, 29 days, 
begins 34 days after and ends 9 days before its Cruciferse, 
72 days, March 20-May 30. The Cruciferse in general bloom 
226 days, March 20-Ocober 31, far beyond the time of this 
bee. Opandrena zizise , 47 days, begins 15 days after and ends 
30 days before the zizioid Umbelliferse, 92 days, April. 18- 
July 18. All of these oligoleges and 26 Andrenid polyleges 
complete their flight in the time of Salix. 
Late Andrenid oligoleges. Andrena nubecula , 79 days, 
begins 12 days after and ends 1 day before its Asterese, 92 
days, August 1-October 31. Pterandrena solidaginis, 71 
days, begins 20 days after and ends 8 days before its Aste- 
rese, 99 days, July 24-October 31. P. asteris, 37 days, begins 
32 days after and ends 10 days before its Asterese, 79 days, 
August 14-October 31. P. alicive, 69 days, begins 35 days 
after and ends 6 days before its Helianthese, 110 days, July 
9-October 26. P. rudbeckise, 67 days begins 11 days after and 
