Colour brownish-yellow; nape black; head covered with a broad greenish-blue blotch, extending from the nose to the neck; upper lip and belly yellow.
Total length, 435 millimetres; tail 50.
Habitat: Western and Southern Australia.
(15) D. nigrescens.—Scales in 15 rows; 170-200 ventrals; 30-46 subcaudals.
Colour dark olive; head black; belly yellow.
Total length, 545 millimetres; tail 75.
Habitat: New South Wales and Queensland.
(16) D. nigrostriata.—Scales in 15 rows; 180-184 ventrals; 50-64 subcaudals.
Colour yellow, streaked with black; head dark brown; upper lip and belly yellowish-white.
Total length, 380 millimetres; tail 52.