(5) _P. diadema_ (fig. 46).--Nasal shield entire, widely separated from the præocular; 2 + 2 temporals; third and fourth upper labials entering the eye; 164-203 ventrals; 40-62 subcaudals. Colour pale brown or reddish, with a brown edging to each scale forming a reticulate pattern; a yellow cross-band on the occiput; belly uniformly white. Total length, 600 millimetres; tail 80. _Habitat_: Eastern, Northern, and Western Australia. (6) _P. warro._--Characters the same as in the previous species; 143 ventrals. Colour brown; a broad lunate black collar on the nape; head black above, but paler than the collar. _Habitat_: Port Curtis, Queensland. (7) _P. sutherlandi._--Characters as before. Scales on the body in 17 rows; 160 ventrals; 40 subcaudals. Colour red-brown on the back, yellow on the belly; a broad lunate black collar on the nape, with a lighter edging; light bars across the head, body, and tail. _Habitat_: Norman River, Queensland. (d) =Diemenia.= [Illustration: FIG. 47.--_Diemenia psammophis._] [Illustration: FIG. 48.--_Diemenia olivacea._ (Northern Australia and New Guinea). (After Krefft.)] [Illustration: FIG. 49.--_Diemenia textilis._] Maxillary bones extending forwards as far as the palatines, with a pair of large grooved poison-fangs, followed, after an interspace, by 7-15 small grooved teeth; anterior mandibular teeth much elongated, resembling poison-fangs. Head scarcely distinct from the neck: eyes rather large, with round pupils; nasal shield entire or divided; frontal elongate. Body cylindrical; scales smooth, in 15-19 rows (more on the neck). Tail moderate or long; subcaudals all or for the most part in 2 rows. Coloration very variable, orange-yellow, olive, red-brown, or pale brown. Average length, 1,000-1,700 millimetres. _Habitat_: South-eastern New Guinea, and Australia. Seven species of this genus are known, divided into two groups as follows:-- (1) Scales on the body in 15 rows. _D. psammophis._ (fig. 47).--Internasal shields at least half as long as the præfrontals. _D. torquata._--Internasals more than half as long as the præfrontals. _D. olivacea._ (fig. 48).--Internasals not more than half as long as the præfrontals; snout broad. [Illustration: FIG. 50.--_Diemenia nuchalis._] (2) Scales in 17 or 19 rows. _D. modesta._--154-165 ventrals. _D. textilis_ (Brown Snake, fig. 49).--190-232 ventrals. _D. nuchalis_ (fig. 50).--184-224 ventrals. (e) =Pseudechis.= Maxillary bones extending forwards as far as the palatines, with a pair of large grooved poison-fangs followed by 2-5 small solid teeth; anterior mandibular teeth long. Head distinct from the neck; eyes rather small, with round pupils; nostril between two nasal shields. Body cylindrical. Scales smooth, in 17-23 rows (more on the neck). Tail moderate; subcaudals in 2 rows, or partly single, partly in 2 rows. [Illustration: FIG. 51.--_Pseudechis porphyriacus._] Total length, 1,500-2,000 millimetres, sometimes more.