Of wild bees approximately 4500 varieties are known. It need scarcely be said that we shall not go through the list. Some day, perhaps, a profound study, and searching experiments and observations of a kind hitherto unknown, that would demand more than one lifetime, will throw a decisive light upon the history of the bee's evolution. All that we can do now is to enter this veiled region of supposition, and, discarding all positive statement, attempt to follow a tribe of hymenoptera in their progress towards a more intelligent existence, towards a little more security and comfort, lightly indicating the salient features of this ascension that is spread over many thousands of years. The tribe in question is already known to us; it is that of the "Apiens," whose essential characteristics are so distinct and well-marked that one is inclined to credit all its members with one common ancestor.* *It is important that the terms we shall successively employ, adopting the classification of M. Emile Blanchard,-- "APIENS, APIDAE and APITAE,--should not be confounded. The tribe of the Apiens comprises all families of bees. The Apidae constitute the first of these families, and are subdivided into three groups: the Meliponae, the Apitae, and the Bombi (humble-bees). And, finally, the Apitae include all the different varieties of our domestic bees. The disciples of Darwin, Hermann Muller among others, consider a little wild bee, the Prosopis, which is to be found all over the universe, as the actual representative of the primitive bee whence all have issued that are known to us to-day.