26 Dr. A. Gunther on new Species of Snakes 



tooth is much longer than, and separated by an interspace 

 from, the preceding teeth. Green, with a yellow line along 

 the vertebral series. A black band commences behind the 

 eye and runs along the side of the fore part of the trunk ; it 

 is soon broken up into irregular spots, which soon disappear 

 entirely. Lower parts uniform yellowish. 



Three examples from Tehuantepec. Length 33 inches, 

 tail 11 inches. 



AhcBtulla modesta. PI. VI. fig. C 



Scales in fifteen rows, very strongly keeled, except those in 

 the outermost series. Ventrals 171; anal bifid; subcaudals 

 171. Snout depressed, not pointed. Rostral shield just reach- 

 ing to the upper surface of the crown ; anterior frontals sub- 

 truncated in front, about half the size of posterior. Vertical 

 not much longer than broad, rather shorter than the snout or 

 than the occipitals, which are truncated behind. Loreal longer 

 than deep. Anteocular extending to the upper surface of the 

 crown, but not reaching the vertical ; two small and short 

 postoculars. Eight upper labials, the fourth and fifth of which 

 enter the orbit. Temporals l + j-^. Eye rather smaller than 

 in the other species of this genus. Uniform greenish-olive 

 above, light green below. A narrow black band from the eye 

 along the suture between the labials and temporals. 



One specimen was obtained by one of Mr. Salvin's collectors 

 on the banks of the E.io Chisoy, below the town of Cubulco ; 

 it is 52 inches long, the tail being 22 inches. 



Ahcetulla lagoensis. 



Ventral shields with distinct lateral keels, 163 ; anal bifid ; 

 subcaudals 150. Nine upper labials, the fourth, fifth, and 

 sixth entering the orbit. Loreal twice as long as deep. One 

 praiocular, not reaching the vertical, two postoculars. Five 

 lower labials are in contact with the chin-shields. Temporals 

 14-2. Scales with minute strise, in fifteen series. Denti- 

 tion syncranterian. Uniform green ; scales without white 

 spots. 



One specimen from Lagos, purchased. Total length 35 

 inches; tail 13 inches. 



Ahcetulla heterolepidota. 



Gunth. Ann. & Mag. Nat. Hist. 1863, xi. p. 286. 



We have received this species in two different collections 

 made at Lasfos. 



