1. Nostril lateral, between two nasals i. Nardoa p. 15. 



2. Nostril supero-lateral in a partly divided 



nasal 2. Liasis p. 16. 



b. Rostral and anterior upper labials deeply pitted 5 



tail prehensile 3. Python p. 19. 



II. Praemaxillary toothless 4. Chondropython p. 28. 



B, No supraorbital bone ; praemaxillary toothless . . . Boinae. 



Head distinct from neck; anterior teeth enlarged . 5. Enygrus p. 31. 



Subfamily Pythoninae. 



i. Nardoa Gray. 

 (GRAY, Zool. Miscell. p. 45, 1842). 



Head slightly distinct from neck, covered with symmetrical 

 shields ; nostril lateral, between two nasals, which are separated 

 from their fellows by the internasals; some of the lower labials 

 pitted; eye small, pupil vertical; praemaxillary toothed; ante- 

 rior teeth very long. Body a little compressed, covered with 

 smooth scales. Tail short, not or slightly prehensile; most of 

 the subcaudals in two rows. 



Distribution. New Guinea; Bismarck Archipelago. 



A single species. 



i. Nardoa boa (Schlegel). 



Tortrix boa, Schlegel, Phys. Serp. 1837, p. 22. 

 Nardoa boa, Boulenger, Cat. Sn. I 1893, p. 76. 



Rostral about twice as broad as deep, not visible from above; 

 internasals more broad than long, two fifths to one third the 

 length of the praefrontals ; one pair of praefrontals; frontal as 

 long as broad or a little more long; 

 two pair of parietals; loreal small; 

 one large praeocular; two (three) 

 postoculars; nine to twelve upper 

 labials, two or three entering the eye; 



three or four of the posterior lower F '^ 6 ' " ardo " boa ( Schlegel) " 

 .... . 10 After SCHLEGEL. 



labials pitted. Scales in 35 39 rows; 



ventrals 245 267; anal entire; subcaudals 47 52. 



Brown with black rings or uniform blackish-brown; a light 

 spot behind the eye. Young specimens with black and orange 

 rings. Length of head and body 830 mm.; tail 120 mm.; 

 largest specimen known 1540 mm. 



