Ecological and Behavior Notes 33 



dently declined to come out into the drear cold weather ; 

 perhaps they even nidificated under the sheltering bark. 



Augochlora persimilis Vier. [S. A. Rohwer]. This 

 golden bee was very beautiful on the black-berry blos- 

 soms at Wickes, May 29, 1920. 



Paralictus cephalicus Robt. [J. C. Crawford]. These 

 bees and their burrows were seen in a clay embankment 

 along the roadside at Falling Springs, 111., September 11, 

 1916. The tunnels went in horizontally at first and then 

 became tortuous; they could be followed only a few 

 inchefi. The width of the tunnel was quite ample, but the 

 opening was just small enough to be snugly closed by the 

 head of the watcher. The males sat quietly for long 

 hours at their doorways. That intruders were effectually 

 kept out was evidenced by the fact that a persistent 

 Ilalictus made six attempts in the course of half an hour 

 to enter one of the burrows, and was always repelled by 

 the guard. 



Cailiopsis nebraskensis Cfd, [J. C. Crawford]. For 

 several summers, a number of large colonies were seen 

 on a baseball diamond on a city lot. The openings of the 

 burrows were completely covered by mounds of fine dust. 

 One nest which was dug up had two entrances covered 

 by separate mounds of dust about two inches apart. 

 These nests were abundantly visited by parasitic bees 

 Sphecodes sp. [S. A. Rohwer], which spent much of their 

 time nosing about the hills, poking their heads into the 

 loose dirt and entering the tunnels below, often scuttling 

 out again head first a moment later. 



Cailiopsis andreniformis Sm. [J. C. Crawford]. One 

 specimen taken from the same area as C. nebraskensis, 

 July 15, 1915. 



Sphecodes ronunculi Robt. [J. C. Crawford]. One 

 specimen was taken on a window sill in a log house, where 

 it was evidently parasitic on some of the inhabitants of 

 the burrows in the logs. 



Andrena craiaegi Robt. [J. C. Crawford]. This bee 



