Mr. G. A. Boulenger on a new Snake. 73 



Underside. Both wings bronzy brown. Anterior wings 

 with a pale streak extending along the basal two thirds of 

 the cell, and a basal diffused orange patch below the cell ; 

 four submarginal conical white spots on the disk between the 

 veins, the lowest of which near the outer angle is bifid. Pos- 

 terior wings with three basal orange streaks, one on the costal 

 margin the shortest, the second in the cell and extending a 

 little beyond it, the third the longest, in the interspace be- 

 tween the lowest median nervule and submedian nervine ; 

 five submarginal conical white spots on the disk between the 

 veins, of which that nearest the anal angle is bifid and the 

 most elongate. 



Female. — Upperside bronzy brown. Anterior wintrs with 

 the disk crossed beyond the cell by a broad oblique orange 

 band, extending from near the middle of the costa, which it 

 does not quite reach, and where it is rather paler, to the 

 lowest median nervule, but not reaching the outer margin ; 

 the outer edge of the band is rather sinuate. 



The underside is paler bronzy brown. On the anterior 

 wings the band is pale tawny, and towards the outer angle is 

 an indication of the bifid conical spot in that position on the 

 underside of the anterior wings of the male. Posterior wings 

 with a submarginal row of white conical spots as in the male, 

 but much less distinct. 



Exp. of wings, J If, $ 2 inches. 



Bab. Ecuador {Buckley). 



Nearest to A. velutina, Bates. 



XT. — Description of a new Genus of Aglyphous Colubrine 

 Snakes from Sumatra. By G. A. BOULENGER, F.R.S. 



Iguanognathus. 



Maxillary, palatal, and mandibular teeth with spatulatc 

 crowns ribbed along the outer side, subequal in size, 23 in 

 each maxillary. Head small, slightly distinct from neck ; 

 eye rather small, with round pupil ; nostril directed upwards, 

 pierced between two nasals ; no loreal. Body cylindrical ; 

 scales smooth, in 19 rows, without apical pits; ventrals 

 rounded. Tail moderate; subcaudals in two rows. Poste- 

 rior prsecaudal vertebras without hypapophyses. 



This genus is founded on a most remarkable snake, the 

 dentition of which is unparalleled among the Ophidia. For the 

 unique specimen, stated to be from Sumatra, I am indebted to 

 Dr. F. Werner, of Vienna, whose name 1 have great pleasure 

 in connecting with the discovery of so interesting a new type. 



Ann. & Mag. N. Hist. Ser. 7. Vol. ii. 6 



