The peninsular rock agama or South Indian rock agama ('Psammophilus dorsalis') is a common species of agama found on rocky hills in south India.

These lizards bask on bare rocks where they are hidden by their cryptic colouration. They feed on insects. The male in the breeding season assumes bright colours. The upper parts become fine vermilion red or yellow, the lip stripe is sometimes pink. The under surfaces, limbs, and tail are black.

Young and females are olive-brown, spotted, speckled, or marbled with dark brown, and with a series of white, elongated spots along each side of the back. The male has pale brownish colour on the top of the head and back, while the lips are yellowish-brown, and this extends as a strip beyond the ear. A dark brown or black lateral stripe begins behind the eye and broadens to cover the lower sides. The underside is yellow with the throat mottled with grey.

From snout to vent, its length is 135 mm (5.31 in) the tail is 200 mm (7.87 in). Females are smaller.

More Info: en.wikipedia.org