150 Bi(Uctin Wisconsin Xdturdl History l^ocicty. [ Vol. 6. Nos. 3-4.. 
One hundred and eighteen loads in twenty-nine and one-half 
minutes or over four to the minute ! Certainly very rapid work 
considering that she covers from one to three feet in flight with 
each load ! And this number in but twenty-nine minutes of a 
working day of over nine hours! (I have seen Anacrabro still 
working at 7:45 P. M.). During her prolonged stays in the nest 
she probably brings the excavated material nearer the door al- 
though this could not be determined. While she was still in view 
each load was carried out as soon as loosened, the mandibles only 
being used to dig. The backward and forward path of lllght 
rarely varies more than a fevv' inches in lateral direction, and its- 
limit is from four to eighteen inches. In one case a ridge of sand 
could be traced beginning two inches from the nest and extend- 
ing over two feet. Anacrabro is quite lazy as far as early morn- 
ing hours are concerned, rarely beginning work before ten o'clock 
though the sun be bright and hot and shine directly on the nest. 
She compensates however by working well into twilight. 
In all but one of the twenty-odd nests examined the entrance 
proceeded from two to six centimeters slightly inclined and 
shallowly underneath the surface and then took a rather abrupt 
bend down into the sand. In the exception the nest entered a 
bluff of a mixture of clay and sand and maintained a curved course 
from the beginning. The first or horizontal portion was usually 
fairly straight, about six millimeters in diameter but the descend- 
ing gallery often pursued so tortuous a course as it proceeded 
between and around stones and obstructions that it would have 
been well-nigh impossible to follow^ it without assistance obtained 
by first filling the nest with plaster of Paris cream. This part 
varied from four to seven millimeters in diameter, the normal 
evidently being six as this was maintained where no obstruction 
was met. The number of cells in a nest is proportionate with 
its age. The terminal portion of the gallery is fashioned into a 
cell, stored and walled off. The further enlargement of the nest 
takes place in one of two ways. Either a short portion of the 
gallery above this cell is filled in and the tunneling continued in 
a new direction beyond it (vide Nest 4) or short tunnels are built 
laterally from the main gallery and proximal to the end cell, the 
ends of these again being formed into cells, stored and closed off. 
(vide Nest 3). This would agree in general with the usual plan 
of the nests of other members of the Crabro family except that 
in none of the Anacrabro nests Avas there a row of cells, a very 
common occurrence with other members of the family. The cells 
average seven by thirteen millimeters in size, elongate — oval in 
