11. TEAOHTBOA. 109 



u. 5 (Sc. 37: V. 183; Ternate. H.M.S. 'Challenger.' 



C. 40). 

 TT. 5 (Sc. 33; V. 175; Misol. 



C. 48). 

 p. ? (Sc. 33; V. 177; New Guinea, S. of Dr. Comrie [C.]. 



0. 41). Huon Gulf. 



<7. ? (Sc. 39; V. 187; Solomon Islands. G. Krefft, Esq. [P.]. 



0. 43). 



4. Enygrus asper. 



Erebophis asper, Giinth. Proc. Zool. Soc. 1877, p. 132, pi. xxi. ; 

 Sauvage, BuU. Soc. Philom. (7) ii. 1878, p. 39 ; Peters Sf Doria, 

 Ann. Mvs. Genov. xiii. 1878, p. 406, pi. iv. ; Hubrecht, Notes 

 Leyd. Mus. i. 1879, p. 19. 



Snout prominent, obliquely truncate ; canthus rostralis angular. 

 Rostral broader than deep, not visible from above ; head-scales 

 small, irregular, vrith small tubercles or short keels ; eight or nine 

 scales from eye to eye across the forehead ; eye surrounded by a 

 circle of 13 or 14 scales ; ten or eleven, upper labials. Scales 

 strongly keeled, the keels forming oblique lines ; 33 to 39 scales 

 round the thickest part of the body. Ventrals 131-146 ; anal 

 entire ; subcaudals 15-21. Eeddish brown above, with a dorsal 

 series of large dark-brown, black-edged spots, which may be con- 

 fluent into a zigzag band; yellowish beneath, uniform or with 

 dark brown spots. 



Total length 730 millim. ; tail 55. 



Misol, Salawatty, New Guinea, and Duke of York Island. 



a. P (Sc. 33 ; V. 140 ; C. 16). Andai, N. Guinea. 



b. $ (Sc. 39 ; V. 146 ; 0. 20). Duke of York Isl. Rev. G. Brown [C.]. 



c. Skeleton. Duke of York Isl. 



(Type.) 



11. TRACHYBOA. 



Trachyboa, Peters, Mon. Berl. Ac. 1860, p. 200. 

 Enygrus, part., Jan, Icon. Gin. OpMd. p. 76 (1865). 



Anterior maxillary and mandibular teeth longest, gradually 

 decreasing in size. Head distinct from neck, covered with scales ; 

 no rostral shield ; nostril in a single nasal. Eye moderate, with 

 vertical pupU. Body compressed. Scales keeled. Tail short, pre- 

 hensile ; subcaudals single. 



South America. 



1. Trachyboa gularis. 



Trachyboa gularis, PeUrs, Mon. Berl. Ac. 1860, p. 200, pi. — . fig. 1. 

 Enygrus gidaris, Jan, Icon. Gin. p. 77, 1. 2, pi. ii. fig. 3 (1861). 



Snout scarcely prominent. Upper head-scales small, convex, 

 keeled, a few on the snout transversely enlarged and smooth ; eye 



