EEPTILIA. 273 



This species and some others having the posterior teeth of the upper jaw 

 longer are placed by DUMERIL and BIBRON in a separate genus named 

 Dromicus. These authors place also Herpetodryas Helena SCHLEG., 

 KUSSELL Serp. I. PL 32, in a separate genus Plagiodon, because the teeth 

 of the upper jaw and the palatine teeth are incumbent, with their points 

 directed to the middle (denies recumbentes, introrsum directi). 



Dendrophis BOIE, SCHLEG. (in part), DUM. BIBK. (add. 

 Leptophu BELL, BUM. BIBR.). Teeth numerous, superior maxillary- 

 teeth in a continuous row, equal, or the last larger. Head elongate, 

 narrowed anteriorly, truncate. Eyes large, somewhat prominent. 

 Anterior ocular scute single, posterior two. Nostrils perforated 

 between the two nasal scutes. Body long, slender, angulate below, 

 covered with narrow scales above. Tail slender, very long. 



Sp. Dendrophis liocercus SCHL., Coluber Ahcetutta L., Leptophis AJicetulla 

 BELL, LINN. Mus. Ad. Frid. Tab. xxn. fig. 3, LAC. Quadr. ovip. et Serp. 

 n. PL u, fig. i, MAX. Pr. v. WIED, Abb. zur Naturgesch. Bras. Lief. xiv. ; 

 brown or green above with a metallic lustre ; scales carinated, no frenal 

 scute (scutum loreum), which exists in all the other species hitherto known, 

 narrow and elongate. The species where the teeth in the upper jaw are all 

 of the same size, and where the median line of the back is covered with a 

 row of longer, hexagonal scales, compose the genus Dendrophis in a more 

 strict sense ; Sp. Dendrophis pictus BOIE, SCHLEG., Coluber pictus L. M us. 

 Ad. Frid. Tab. xvii. fig. 2, LAC. Quadr. ovip. et Serp. n. PL 10, fig. 2, 

 PL 1 1, fig. 2, from the East Indies, &c. 



Coluber L. (exclus. of several species). Head elliptic, 

 more or less distinct from trunk, in some scarcely distinct. Gape 

 of mouth moderate. Eyes moderate ; pupil round. Posterior 

 ocular scutes two. Scales mostly smooth, more rarely carinate. 



Coronella LAUR. (in part), Zacholus WAGL., FITZ. Teeth sub- 

 equal, small, last two upper teeth longer. Nostrils in middle of 

 nasal scute. Trunk cylindric, nearly equal. Tail short. Scales 

 very smooth. 



Sp. Coluber amtriacus GMEL., Coronella austriaca LAUR., Coronella Icevis 

 BOIE, LAURENTI Specimen, Tab. v. fig. i, STURM, Deutschl. Fauna, 

 Amphib. Heft 2 ; in many countries of Europe. 



Coluber BOIE, SCHLEG. Teeth equal (Elaphis BONAP., DUM., BIBR) 

 or gradually increasing in upper jaw towards the hinder (Chorisodon 

 DUM., BIBR.), continuous, or the larger separated by an interval 

 (Zamenis DUM., BIBR.). Nostrils perforated in the suture between 

 the two nasal scutes. Trunk incrassate towards the middle. Tail 

 moderate. 



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