你所说的类属，实际是定冠词的“类指”，即the +单数名词指这一类的事物。

这和作者想表达的意思有关，和修饰语没关系。要根据语境判断。

以你的第一个句子为例：The cobra in Africa is more dangerous. 非洲的眼镜蛇更危险。如果作者指非洲的眼镜蛇这一类，就是类指。可能的语境是：其它地区的眼镜蛇可能不危险。当然我们这里不去考虑现实如何，只是从语言的用法上分析。如果作者表达的意思是非洲的这只眼镜蛇，这就不是类指，是特指了。

根据你的例句，我给你几个外刊例句作参考和体会：

1. In comparison with the lion of Africa and the tiger of Asia, though these may exhibit more activity and bloodthirstiness, the grizzly is not second in courage and excels them in power.

2. Poisonous snakes in other parts of the world include sea snakes, the fer-delance, the bushmaster, and the tropical rattlesnake in tropical Central America; the Malayan pit viper in the tropical Far East; the cobra in Africa and Asia.

3.The largest skins are those of the bear from Europe, Asia, and America, of the lion from Africa, and of the tiger from India.