_Coluber trivittata_ of Mr. R. p. 80, of this work. Judging from the descriptive name and the locality, is the _C. sirtalis_ of authors, or possibly the _C. saurita_ or _C. ordinatus_. These serpents have each the three vittæ, though in the two former this trait is much more striking. I know of no other serpent in our vicinity to which the name can be characteristically applied. The _ordinatus_ has been called _bipunctatus_ and _ibibe_ by the French school. What is the difference between _sirtalis_ and _saurita_? they must be very closely allied, if not synonymous. _Coluber getulus_, Lin. This species attains to a more considerable magnitude than authors have stated. I saw a specimen on Cumberland Island, Georgia, at least five feet long. The ground colour, by the direction of light in which I viewed him, was deep glaucous or livid, he was much more robust than _C. Constrictor_.[36] He permitted my near approach, without agitating his tail in the menacing manner of the serpent just mentioned, and of the crotali, or manifesting any signs of fear. In my anxiety to secure him, he eluded my grasp, and by a sudden and rapid exertion, disappeared, with all the rapidity of movement so remarkable in the _constrictor_. This last, from his celerity, is known in many districts by the name of _Racer_. _Coluber heterodon._ This viperine species, of which Latreille has formed a genus under the name of _Heterodon_, varies considerably in its markings, and like most of our serpents, is not constant in the number of its plates and scales, (126, 48-138, 42-141, 42, &c.) perhaps too much reliance has been placed upon colour, and upon the number of the plates and scales beneath the body, of the Ophidiæ generally. In the form of the anterior termination of the head, the _heterodon_ is remarkable, and a good specific character may be obtained from the orbital scales, which are eleven or twelve in number; the parabolic curve which passes through the eyes, and terminates at the maxillary angles, is also generally present. This same serpent was figured in Deterville's ed. of Buffon, under the name of _Coleuvre cannelee_. The _heterodon_ abounds in many sandy situations, and near the sea-shore. Several persons pursuing a pathway, passed within a few inches of one of them without his betraying any emotion, but the moment he perceived me advancing with my eye fixed upon him, he with a sudden exertion assumed a defensive attitude, by elevating the anterior portion of his body, flattening his head, and 3 or 4 inches length of his neck; these he waved with a steady and oblique motion from side to side, uttering at the same time an audible sibilation, he made no attempt to escape, and seemed absolutely fearless until taken. They have the habit of the vipera, but not the fangs. It seems to be synonymous with _Coluber simus_. This species is often called _mockeson_. Dr. Shaw's description of _Boa contortrix_ seems to indicate this species.