202 Trans. Acad. Sci. of St. Louis 
These wasps were found to be present at the bank in 
great numbers on May 27th and 28th. This was before 
their nesting activities had begun. The significance of 
their presence has not yet been determined, so I could 
only state the circumstances. They were on an elm 
sprout six feet tall, which grew between the rambler 
rose and the front of the bank. Other insects were there 
too, so I thought possibly the aphids, which were plen- 
tiful there, constituted the attraction, but I could not see 
that they got anything from the aphids; in fact, the 
plant-lice were on the under side of the leaves while the 
wasps always walked about on the tops of them. 
The wasps were constantly active on the shrub, flying 
and hopping about, running nervously over the foliage 
and jumping or dropping from leaf to leaf. The per- 
formance began at about 7:30 a. m. when the first few 
arrived and became active; the number rapidly increased 
as time passed. Standing a short distance away, one 
could see others coming in from various directions to 
join the dance—for apparently this gathering was some 
sort of social function—a stag affair, however, for @ 
dozen or so taken in the net proved to be all males. I 
suspect that they were awaiting the emergence of their 
mates, and that if I had been on hand at the proper 
time, a little later, I could have witnessed some pretty 
courtship festivities. 
Leaf-cutter bee, Megachile campanulae Rob. [J. ©. 
Crawford]. 
One specimen of this bee was seen at the clay bank; 
it was at once taken for identification, and therein the 
prospective founder of a colony was evidently destroyed, 
since in the following years this bee was not seen again. 
