ON REPTILES COLLECTED NEAR GUAYAQUIL, ECUADOR. 89 



bliick. In this case there are two anteorbitals on each side, 

 the lower one extending between the orbit and the labials 

 to the lower of the two postorbitals. In the middle of the 

 yellow color of the flank a black band passes back from the 

 lower jaw over more thtin one-third of the length ; behind 

 this it becomes a series of large spots ; and these latter, to- 

 ward the tail, extend downward to the median ventral line 

 and join the spots from the opposite side to form trans- 

 verse bands. 



The third example has 53 rows, nineteen of them in 

 the black, and in the ventral series has 340 on the body, 

 and 45 on the tail. On one side of its head there is one 

 anteorbital, which is separated from the lower of the two 

 postorbitals by the fifth labial. On the other side there 

 is a single postorbital ; this is separated fi'om the lower of 

 the two anteorbitals by the fifth labial. There are eight 

 labials, of which the fonrth is small and crowded nnder 

 the third and fifth. Infralabials 11-12. 



The fourth individual has 53 rows of scales, seventeen 

 of them black ; and in the ventral series there are 351 on 

 the body, and 49 on the tail. It has two anteorbitals on 

 one side, the lower one united with the fourth labial and 

 extended below the eye to the lower of the two postorbitals. 

 On the other side it has two ante- and two postorbitals, 

 with a large suborbital between the eye and the labials. 



Only one of the four specimens has black in the yellow 

 of the flank. On two of them the black of the back is 

 regular in its lower margin to the base of the tail, where 

 it breaks into rounded blotches which descend on the sides 

 and alternate with others extending up from the lower 

 edo-e of the tail. On the other two the black of the back 



o 



becomes sinuous in its lower edges, not far from the middle 

 of the body, and breaks up on the tail, where scattered 

 small spots of black appear. 



ESSEX INST. BULLETIN, VOL. XXIV 12 



