Example of light-skinned Caucasoid (North Indian):

Brown-skinned Caucasoid (Western Indian):

Dravidians: (different skull shape and facial features)

Mixed race Caucasoid and Dravidian (common in Central India Hindi belt):

浅皮肤高加索人种((北印度):

棕色皮肤高加索人种(印度西部):

德拉维人:(不同的头骨形状和面部特征)

混合人种高加索和德拉威人(在印度中部印地语带很常见):

Mansi Srivastava, Human, Humane

The general belief is that the people of the northern part of India belong to the Aryan race (which is a sub-race of the Caucasian race)  whereas the people of the southern part belong to the Dravidian race (which is tentatively grouped as Australoid)

Now, to answer your second question, the categorization of Dravidian Race has always been uncertain but Carleton S. Coon, in his book The Races of Europe (1939), classified the Dravidians as Caucasians due to their Caucasoid skull structure and other physical traits such as noses, eyes and hair.

The Dravidians have been linked to the Australian and Ethiopian people in the past but the general consensus is that Dravidians are indigenous to India. (Considering the fact that Dravidians are also described as people who speak the Dravidian languages, members of the group are part of the population of Sri Lanka too.)

The Indo-Aryans are also indigenous to Indian subcontinent.

人们普遍认为印度北部的人属于雅利安人(雅利安人是高加索人种的一个分支)，而南部的人属于德拉威人(暂定为南岛人)

现在，回答你的第二个问题，德拉威人种族的分类一直是不确定的，但是卡尔顿·s·库恩(Carleton S. Coon)在他的著作《欧洲种族》(the Race of Europe, 1939)中把德拉威人归为高加索人，因为他们的头骨结构和其他身体特征，比如鼻子、眼睛和头发。

德拉威人过去一直与澳大利亚和埃塞俄比亚人民有关联，但普遍的共识是德拉威人是印度的土著。(考虑到德拉威人也被描述为说德拉威语的人，这个群体的成员也是斯里兰卡人口的一部分。)

印度雅利安人也是印度次大陆的土著。