Total length, 1,620 millimetres; tail 210. _Habitat_: New South Wales. (2) _H. bitorquatus_ (fig. 58).--Ventral scales strongly angulate laterally, 191-227; subcaudals 44-59. [Illustration: FIG. 58.--_Hoplocephalus bitorquatus._] Colour olive-green; head pale olive, with a bright yellow occipital blotch, and a large black blotch on each side of the nape; a pair of small spots in front of and between the eyes; three black transverse blotches on the vertex; belly greyish-olive or brown. Total length, 510 millimetres; tail 95. _Habitat_: Queensland, New South Wales. (3) _H. stephensii._--239 ventrals; 60 subcaudals. Body barred alternately with black and white; the black bars are twice as broad as the white ones; head dark, spotted with yellow; a W-shaped yellow mark on the back of the head. Total length, 760 millimetres. _Habitat_: Port Macquarie, New South Wales. (i) =Tropidechis.= Same general characters; nasal shield entire; scales on the body strongly keeled, in 23 rows. Tail moderate; subcaudals in a single row. _T. carinatus._--Colour dark olive, with darker cross-bands; belly yellow, more or less tinged with olive-green. Total length, 730 millimetres; tail 120. _Habitat_: New South Wales, Queensland. (j) =Notechis.= Same general characters; pupil round; nasal shield entire. Body cylindrical; scales smooth, disposed obliquely, in 15-19 rows, the lateral scales shorter than the dorsals. Tail moderate; subcaudals in a single row. _N. scutatus_ (Syn. _Hoplocephalus curtus_. The Tiger Snake. Fig. 59).--Colour dark olive; belly yellow or olive; the shields often dark-edged. [Illustration: FIG. 59.--_Notechis scutatus_ (The Tiger Snake.)] Total length, 1,280 millimetres; tail 170. _Habitat_: Australia and Tasmania. (k) =Rhinhoplocephalus.= Dentition as in _Hoplocephalus_. Head but little distinct from the neck; eyes small, with round pupils; no internasal shields. Body cylindrical, rigid. Scales smooth, in 15 rows. Tail short; subcaudals in a single row. _R. bicolor._--Colour greyish-olive on the back, yellowish-white on the belly; tongue white. Total length, 395 millimetres; tail 55. _Habitat_: Australia. (l) =Brachyaspis.= Characters the same, but head distinct from the neck; eyes small, with vertically elliptic pupils; nostril between two nasal shields. Body stout, cylindrical; scales smooth, slightly oblique, in 19 rows. Tail short; subcaudals in a single row. _B. curta._--Colour uniform olive-brown; belly yellowish. Total length, 490 millimetres; tail 70. _Habitat_: Western Australia. (m) =Acanthophis= (_Death Adder_). (Figs. 60, 61.)