Vol. XXXl] ENTOMOLOGICAL NEWS 43 



pollen. The bees were flying as much as an hour before sun- 

 set, and quite likely may be found occasionally still earlier. 

 For oenotherae only the one record is available, two of the 

 specimens having been taken as late as any of texanus. 



The flowers of Gaura visited by aberrans open earlier, and 

 the bees are able to complete their work earlier, their time of 

 greatest activity seeming to be at about sunset. This species 

 is found quite frequently at other times of day. Forswenki, 

 the hour preceding sunset appears to be the time of greatest 

 activity, altho it may also be found at other times of day. 

 I do not know where the females collect pollen, but do not 

 believe it is from the Onagraceae, as their scopa is of the ordi- 

 nary type, the femora having long hairs with slender branches, 

 arising from the two edges and meeting over the posterior 

 surface. 



OTHER VISITORS AND NOTES ON THE FLOWERS. 



At Blue Rapids, I took also at Allionia nyctaginea, females 

 of Halictus forbesi and both sexes of a Chloralictus . At Shel- 

 don at A. hirsuta, H. forbesi and male of Agapostemon texanus. 

 At Lisbon, North Dakota, Aug. 8, 1919, a worker of Bombus 

 separatus Rob. collecting pollen of Gaura coccinea just at sun- 

 set; at Fargo, N. D., workers of B. ternarius Say. and B.fervi- 

 dus Fab. sucking nectar at Onagra strigosa. Gaura coccinea 

 is regularly visited at dusk by brown moths of medium size 

 (Noctuidae?) and I have seen the ruby-throated humming 

 bird at both Onagra strigosa and Anogra pallida in North Da- 

 kota. 



An interesting point bearing upon the controversy of at- 

 traction by color or smell is brought to notice. The bees 

 (H. texanus) were observed flying about the flower buds be- 

 fore any sign of opening was visible. It scarcely seems pos- 

 sible that they could then be attracted bv either color or odor. 

 The odor of the freshly opened flowers of Anogra is strong and 

 heavy, quite noticeable at a distance of a meter. The open- 

 ing of the flower was sudden, a small cleft appearing at the 

 apex, increasing to 6 or 8 mm. in a few minutes, then suddenly 

 opening wide (in perhaps 15 or 20 seconds). 



