But we have not as yet touched on the acme of the difficulty; namely, the fact that the neuters of several ants differ, not only from the fertile females and males, but from each other, sometimes to an almost incredible degree, and are thus divided into two or even three castes.
Baina ez dugu oraindik ukitu zailtasunaren gailurra; hau da, zenbait inurri espezietako neutroak, ar eta eme ugalkorrengandik ezezik, beren artean ere ezberdinak direla, batzuetan sinesteak ere lanak ematerainoko mailan, eta era horretan kasta bi edo are hirutan banatzen direla.