Dr. A. Giinther on some Species of Tree-Snakes. 285 



Ahatulla irregularis. 



Coluber irregularis, Leach, in Bowdich, Ashantee, App. p. 4.94. 

 Dendrophis Chenonii, Reinh., in Dansk. "Vid. Selsk. Afh. x. 1843, p. 246, 



tab. l.fig. 13,14. 

 Dendrophis (Philothamnus) albovariata, Smith, Illustr. Zool. South Afr., 



Rept. pi. 65, and pi. 64. fig. 3. 



Ventral shields with lateral keels ; upper labials nine, three 

 of which enter the orbit; temporal shields generally 1+2; 

 frequently one or two are broken up into two, or the two hinder 

 ones are united ; in this case the temporal shields are generally 

 not symmetrical on both sides. Anal bifid; ventral shields 

 164-167; subcaudals 108-126. Scales smooth, in fifteen 

 rows, apparently with one apical groove. Teeth longest behind, 

 in a continuous series. Green, skin between the scales black, 

 each scale with a white spot on the basal half of its outer margin. 



Western coasts of Africa (Fan tee, Gambia, MacCarthie Island); 

 Cape Colony. Two young specimens, which we refer to this 

 species, were sent by Consul J. Petherick from Central Africa, 

 500 miles south of Chartoum. 



Ahatulla hcteroderma. 



Chlorophis heterodermus, Hallovvell, Proc. Ac. Nat. Sc. Philad. 1857, p. 52; 

 Cope, ibid. 1860, p. 559. 



Ventral shields with- lateral keels ; upper labials nine, three 

 of which enter the orbit; temporal shields 2 + 2 + 2. Anal 

 entire; ventral shields 150-157, subcaudals 83-92. Scales 

 smooth, in fifteen rows, some with two apical grooves. Teeth 

 longest behind, in a continuous series. Green, skin between the 

 scales black ; each scale with a white spot on the basal half of 

 its outer margin. 



We have received several specimens of this Snake from the 

 Gold-coast. 



Ahatulla semivariegata. 



Dendrophis (Philothamnus) semivariegata, Smith, Illustr. Zool. South Afr. 

 jd. 59, 60, and pi. 64. fig. 1. 



Ventral shields with lateral keels ; upper labials nine, three 

 of which enter the orbit ; temporal shields in two rather irregular 

 longitudinal series. Ventral shields 207 ; subcaudals 112. Scales 

 smooth, in fifteen rows. Green anteriorty, yellowish posteriorly ; 

 anterior part of the trunk with irregular, narrow, black trans- 

 verse bars. Cape Colony (Bushman Flat). 



Ahatulla natalensis. 



Dendrophis (Philothamnus) natalensis, Smith, Illustr. Zool. South Africa, 

 pi. 64. 



Ventral shields with lateral keels ; upper labials eight*, the 



* Eight specimens, examined by myself, have eight upper labials ; and 



