42 ENTOMOLOGICAL NEWS [Feb., '2O 



were taken at Symphoricarpos an hour after sunrise; at the 

 same place on July 24 one of each sex at the same flowers 

 about half an hour before sunset. No females, however, were 

 found at Allionia where most of the males were taken. 



The flowers of Allionia hirsuta seemed to open about an 

 hour before sunset and were withered by sunrise next morning. 

 Those of Gaura coccinea open some time before sunset. They 

 are white, about 6-8 mm. wide, petals narrow, anthers only 

 about 2 mm. long, the pollen scanty and not so well cohering 

 as in the species previously described. Meriolix serrulata, a 

 day-flowering species, has yellow flowers, the pollen scarcely 

 at all cohering. A number of plants of it stood with open 

 flowers and undisturbed pollen near the place where the bees 

 were found at Symphoricarpos in the morning. In the case of 

 aberrans the pollen is carried between the inner sides of the 

 posterior tibiae and femora. 



No observations were made upon H. oenotherae farther than 

 that the females were visiting Megapterium in the late evening 

 with H. texanus. Two specimens have some pollen on their 

 legs. 



VISITS OF H. SWENKI TO FLOWERS 



This species has been included chiefly because many of both 

 sexes were found at Allionia hirsuta at Sheldon on Aug. 10, 

 1919. This was during the hour before sunset. Shortly after 

 sunset a number of plants were examined and only a single 

 female found. The first specimens taken were several males 

 at the same place, Aug. 13, 1916, on Petalostemon villosum: 

 I had collected nearly all day at these and other plants, but 

 took none of H. swenki until these in the late afternoon. At 

 the same place, Aug. 21, 1918, two or three of each sex were 

 taken in the early forenoon at Linum rigidum. 



HOURS OF FLIGHT OF THE SPECIES MENTIONED. 



Further data are needed to show to just what extent these 

 bees are "night flying." Those so far available tend to show 

 that texanus extends its work farthest into the night, at least 

 until quite dark. This, according to my observations, was 

 necessitated by the time of opening of the flowers visited for 



