much larger than dorsals. The coloration is also quite different. 

 The difference from A. purpurescens will be pointed out under 

 that species. 



I took a single specimen from the oesophagus of a Her- 

 petodryas carinatus (No. 61). It is in perfect condition, except 

 that more than half of the tail is broken off. 



Xiphocercus heterodermus Dum., three specimens, Nos. 

 6, 7 and 61. 



Thecodaciylus rapicaudus Hout., four specimens, No. 2. 



Ameiva surinamejjsis Laur., No. 12. 



Cnemidophortjs minimus Laur., two specimens, Nos. 4 and 50. 



Cnemidophorus lemniscatus Daud., four specimens, No. 4a. 



Oreosaurus striatus Peters. 



Anadia bogotensis Peters, nine specimens. 



Heterodonium bicolor gen. et sp. nov., Plate III. 



Char. gen. — Frontonasal plate separating nasals; pre- 

 frontal and frontoparietal plates absent; nostril in suture be- 

 tween nasal and first lateral plates; no interparietal plate. 

 Limbs rudimental, two pairs; digits 4-1, the anterior clawed. 

 No femoral pores. 



This genus differs from Sesquipes, since the latter has 

 digits 4-2; in the allied genus Microdactylies they are 3-3. 



I have pointed out the penial characters of this genus in the 

 "Proceedings of the Philadelphia Academy of Natural Sciences," 

 1896, p. 466. A welt bounds the sukms spermatieus on each side. 

 The space between these is marked by a few feeble cross folds, 

 and the borders support a single series of closely placed recurved 

 spines. 



Char, specif. Scales in annuli of twenty-eight scales, 

 which are angular at the extremities and alternate with those 

 of the adjacent annuli. Labials 5-6; temporals 2-2-2. Three 

 large preanal plates longer than wide. Tail long, obtuse; hind 

 legs minute. Anterior digits short, subequal. Brown above, 

 separated abruptly on each side from the darker brown of the 

 sides and lower surfaces. Chin and throat yellowish. Scales of 

 upper surface each with a bluish spot. 



