The Progress of the Race 
at the expense of the working type of 
its race.! 
Among the bees, however, which are 
somewhat too arbitrarily termed the “ sol- 
itary Apide,” the social instinct already 
is smouldering, like a flame crushed be- 
neath the overwhelming weight of matter 
that stifles all primitive life. And here 
and there, in unexpected directions, as 
though reconnoitring, with timid and 
sometimes fantastic outbursts, it will 
succeed in piercing the mass that op- 
1 The humble-bees, for instance, have the Psithyri 
as parasites, while the Stelites live on the Anthidia. 
«« As regards the frequent identity of the parasite with 
its victim,’’ M. J. Perez very justly remarks in his book 
«The Bees,’? <*one must necessarily admit that the 
two genera are only different forms of the same type, 
and are united to each other by the closest affinity. And 
to naturalists who believe in the theory of evolution 
this relationship is not purely ideal, but real. The 
parasitic genus must be regarded as merely a branch 
of the foraging genus, having lost its foraging organs 
because of its adaptation to parasitic life.” 
393 
