16 TGUANID^. 



The adpresscd hind limb reaches the end of 



the snout 32. atircolxs, p. 49. 



J J Tibia considerably shorter than the distance 

 between the end of the snout and the ear- 

 opening. 



Occipital scarcely larger than the ear-opening, 

 separated from the supraorbitals by two 

 series of scales 42. baccatus, p. 54. 



Occipital considerably larger than the ear- 

 opening, separated from the supraorbitals 

 by three or four series of scales 43. guentherl, p. 54. 



** Scales on upper surface of snout smooth. 

 t Occipital larger than the ear-opening. 



J Canthus rostralis weak ; snout not produced. 



Supraorbital semicircles separated by two or 

 three rows of scales ; the adpressed hind 

 limb reaches the front of the orbit 36. bocourtii, p. 50. 



Supraorbital semicircles in contact or sepa- 

 rated by one row of scales ; the adpressed 

 hind limb does not reach the eye 37. ortonii, p. 51. 



X% Canthus rostralis sharp ; end of snout truncate 

 in the female, compressed and produced in the 

 male. 



Ventral scales smooth 47, puactatus, p. 57. 



Ventral scales keeled 48. bouhnc/eri, p. 58. 



ft Occipital not larger than the ear-opening. 

 Supraorbital semicircles in contact 50. buclcleyi, p. 58. 



b. Occipital in contact with supraorbitals. 

 Supraorbital semicircles in contact 49. transvers(dis,^.58. 



B. Occipital very small or quite indistinct, at any rate smaller 

 than the ear-opening. 



a. Tibia as long or nearly as long as the distance between 

 the end of the snout and the ear-opening. 



a. Median dorsal scales keeled. 



* Head (to occiput) a little longer than the tibia. 



t Caudal scales subequal. 



16 to 18 lamellae under phalanges ir. and iii, 



of the fourth toe ; ventral scales smooth or 



indistinctly keeled 38. schiedii, p. 52. 



13 or 14 lamellae under phalanges ii. and 



III. ; ventrals keeled 40. tro2ndole2ns,i). 53. 



