Calamaria andersoni

Anderson's reed snake (Calamaria andersoni) is a small snake endemic to China, recorded in Yunnan. It is brown above with indistinct narrow black stripes on the flanks, and the underside of the head is light yellow with brownish flecks on the lower lip and chin shields. (The Reptile Database; Wikipedia, general species account)

It has four upper labials, of which the second and third touch the eye, and one preocular. (Wikipedia, general species account)