INNOCUOUS SERrENTS. l7l 



Colour above, a deep leaden hue ; below yellowish, with 

 two middle rows of blackish spots. S. 137 + 56. 



9. IIoMALOPSis ANGULATA. — Habit of a Tropidonotus, 

 but it has a more massive form ; head large and rounded, 

 covered by 8 rather small plates ; the single frontal ad- 

 vances between the nasals ; eyes more than usually large ; 

 19 rows of scales, strongly carinated. Yellowish, passing 

 to red on the sides ; above varied by very broad angular 

 spots of a deep colour, with their points prolonged down- 

 wards, to form square alternate spots. Posterior teeth 

 without a groove. S. 118 + 66. Lung simple. From 

 the river Amazons to Martinique. 



10. HoMALOPSis PLicATiLis. — Well characterized by its 

 very long and narrow head, but with a muzzle of remark- 

 able shortness ; by its large, blunt, smooth scales disposed 

 in 15 rows ; and by its colours. The frenal plate want- 

 ing ; shape very vigorous ; trunk very thick and cylindri- 

 cal. S. 134 + 38. Above of a brownish red; on the 

 sides a very broad dark ray, accompanied by a series of 

 spots ; below yellowish, with two rows of brownish points. 

 From Brazil ; a very pretty variety of it exists at New 

 Orleans, characterized by its vivid tints. 



11. HoMALOPSis Martii. — Head nearly as in H. plum- 

 bea, but more depressed and more lengthened ; eyes very 

 small ; nostrils very near the end of the muzzle ; trunk 

 much more slender than usual, and cylindrical ; 15 rows 

 of smooth scales ; body surrounded with rings of brown, 

 alternately of two shades ; the adults are of an almost 

 uniform black, and have a very shining skin. S. 158 + 

 48. From the river Amazons to Surinam. 



12. HoMALOPSis Reinwardtii. — Of large size, and of an 

 elongated form ; tail very short and thick ; 21 rows of 

 smooth scales ; all the trunk of nearly equal thickness, and 

 a little compressed ; physiognomy like that of H. plicatilis. 

 Above blackish red-brown, below reddish yellow : these 

 two tints interlace on the sides, to form bands and sf)ots. 

 S. 180 + 42. Discovered in Louisiana. 



13. HoMALOPSis Leopardina. — Allied to H. angulata 

 by the structure of the scales, to H. plicatilis by the form 

 of the head. A single frontal plate wedged between the 

 nasals ; of a reddish brown, relieved on the upper parts 



