In Russia the small Asiatic cockroach has everywhere driven before it its great congener.

在俄罗斯，小亚洲蟑螂到处都在驱赶它的大同类。

We have seen that a species under new conditions of life may change its habits, or it may have diversified habits, with some very unlike those of its nearest congeners.

我们已经看到， 一个物种在新的生活条件下可能会改变它的习性， 或者它可能具有多样化的习性， 其中一些习性与其最接近的同类非常不同。