Varanus head sketch from Fauna of British India (G A Boulenger; George Albert Boulenger).
A = Varanus bengalensis,
B = Varanus salvator

Monitor lizard.

Source: https://commons.wikimedia.org/wiki/File:Varanus.jpg

The Bengal monitor (Varanus bengalensis) or common Indian monitor, is a monitor lizard found widely distributed over the Indian Subcontinent, as well as parts of Southeast Asia and West Asia.

Asian water monitor (Varanus salvator), also known as Malayan water monitor, common water monitor, two-banded monitor, rice lizard, ring lizard, plain lizard, no-mark lizard, and simply the water monitor, is a large lizard native to South and Southeast Asia. Water monitors are one of the most common monitor lizards found throughout Asia, and range from Sri Lanka and India to Indochina, the Malay Peninsula, and various islands of Indonesia, living in areas close to water.