Catalogue de New York reptiles et batraciens . nettement triangulaire en contours, et sepa au prorata de l'organisme par un cou relativement limitée. Le^ rattlesof rattlesnaktes de deux espèces sont bien sûr une unmistakablecharacteristic. La copperhead ne porte aucune marque distinctive tel,et est fréquemment confondu avec l'inoffensive couleuvre, orblowing adder (p. 368), le serpent d'eau (p. 377) et parfois le evenwith snake familiers (p. 374). Une lecture attentive de l'thedescriptions et l'inspection des coupes données de ces espèces, andcomparison avec ceux de la copperhead fera
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Catalogue of New York reptiles and batrachians . markedly triangular in outline, and sepa-rated from the body by a relatively constricted neck. Tlie rattlesof the two species of rattlesnaktes are of course an unmistakablecharacteristic. The copperhead bears no such distinguishing mark, and is frequently confused with the harmless hog-nosed snake, orblowing adder (p. 368), the water snake (p. 377) and occasionally evenwith the familiar milk snake (p. 374). A careful reading of thedescriptions and inspection of the cuts given of these species, andcomparison with those of the copperhead will make the points ofdifference clear. Much attention has naturally been paid to the Orotalidae byAmerican authors, and numerous papers on the subject have beenpublished. By far the most valuable and comprehensive work onthe venomous snakes of North America is that by Dr LeonhardStejneger (95), curator of reptiles and batrachians at the UnitedStates national museum, to which the reader is referred for a verydetailed discussion of our poisonous snakes.. ?po df Fig. 1 Illustrating nomenclature of the head scales of serpents Nomenclature of the scales Certain terms frequently used in describing the characters of thespecies require definition here. The vertical or frontal plate (-«) is the central, shield-shaped plate 362 NEW TOBK STATE MUSEUM in the middle of the head above; on either side of it are the super-ciliary plates (s) lying immediately above the eye. The pair ofplates immediately in front of the vertical are the prefrontals (^);in front of these lie the internasals (of), while the plate terminatingthe muzzle, and lying in front of the prefrontals, is the rostral ir).The plates behind the supereiliaries and vertical are the occipitals (o).The plates immediately behind the eye are the postoculars, orpostorbitals (j>o); those in front of the eye are the preoculars, ante-oculars or anteorbitals {ad), in front of which are the loreals (lo).Between the loreal and the rostral, and
