142 BULLETIN OF WISCONSIN NATURAL HISTORY SOCIETY. VOL. 4, NO. 4. 
egg. For this reason such a bee usually has to make repeated 
visits to the nest, in order to be on hand when the right time 
comes. If it were in the habit of wandering around until it 
happened to come across a host-bee's cell in the proper stage of 
construction, then it might not get much chance to deposit an egg 
within its lifetime of a few weeks duration, especially in rainy 
seasons. It is even possible that a parasitic bee has more than one 
nest under observation during the same period. 
Of course I do not wish to be understood as applying the 
statements set forth above to parasitic bees in general, but I have 
good reasons for believing that in this respect the behavior of 
the species of Triepeolus, Coelioxys and Stclis known to me agrees 
with that of Argyroselenis minima. 
