The species is endemic to Hong Kong.

[3][4] The specific name, lazelli, is in honor of American herpetologist James Draper "Skip" Lazell.

[5] I. lazelli is characterized by having 18 scale rows around the body.

[2] The mental is projecting, and the second and third upper labials overlap the shields above them.

[3] The preferred natural habitat of I. lazelli is forest, at altitudes of 100–200 m (330–660 ft).