430 Trans. Acad, Sci. of St. Louts 
heeding our presence. She would remove the load of 
mud from her mandibles to her front legs and apply it 
to the structure in its proper place and then smooth and 
work it down with her head. Her mud-puddle could not 
have been far off, for she required only from one to three 
minutes to make her round trip and bring her load of 
mortar. 
As usual, the male remained in the tube that was being 
constructed while the female brought the mud and con- 
tinued the building. The male sometimes poked his head 
out of the cell to meet or greet his spouse, in a way very 
similar to the habit we have seen in the smaller species, 
T. clavatum. A long pipe was first constructed (fig. 60). 
This was then filled for a certain distance with spiders 
and an egg laid with them and a partition put in, making 
a cell out of this section of the pipe. This process was 
repeated until the entire pipe was divided into cells, and 
then a second tier was made beside it. Since all nests 
are built vertically, with the openings downward, one 
wonders what prevents the spiders falling out while the 
cell is being filled, the egg laid and the mud applied for 
the partition. I have wondered whether the male did 
not in some way perform this office. It was soon neces- 
sary for me to leave, so I captured the female and took 
down the nest. We found the male ’way up in the top- 
most corner of the unfinished tier. The two older tiers 
were complete in every way, properly partitioned and 
sealed, and each cell contained spiders and a young wasp. 
[I have often wondered where the participation of the 
male in the nesting begins—whether the female starts 
the nest and the male finds it, or her, and assists, oF 
whether they find each other first and proceed to plan 
their home. One afternoon I had the good fortune to see 
a part at least of this performance. At 2:30 my atten- 
