178 Trans. Acad. Sci. of St. Louis 
pid, dejected condition, heavily covered with dew. On 
September 23 it was quite apparent that these insects 
were being rapidly reduced in numbers by death. Several 
dead ones were picked up from where they had fallen 
beneath the mouth of their burrows, and there was no 
way of ascertaining how many more dead remained 
within. It is natural to think that females of such 
species as this continue to work to the last, but on the 
occasion of my visit on October 3, there were three 
mother bees that were no longer exerting themselves on 
home cares, or in any way trying to work, but appeared 
to be simply idly waiting to be overtaken by death. In- 
deed they lingered on beyond their just day, for even 
their food-plants, the pollen bearing flowers, had almost 
all ceased to bloom.” 
While I was unsuccessful in determining the number 
of nests made by each mother, the total number of nests 
for the whole colony from year to year is of interest. In 
1917, there were 62 nests; in 1918, 55; in 1919 the number 
went down to 37, and in 1920, 49; in 1921, 51 and 1922, 40. 
When one sees the enormous population of Anthophora 
in 1921, many of which were trapped and perished, and 
compares it with the 1921 Entechnia population, one 
sees a vast difference in their rate of increase; in the 
five years residence, one species has increased phenome- 
nally, while the other has barely held its own. 
The dates of emergence for the various years will be 
treated under climate, and other details are elsewhere 
given in these pages. 
*At even a later date than this, however, on October 17, 1919, 
one was seen to enter its ‘ene at Hematite, Mo., several miles 
south of the clay bank. 
