. Les animaux et l'homme ; un manuel élémentaire de zoologie et de physiologie humaine. Zoologie, physiologie. Les vertébrés. À l'exception de la coral- ou bead-serpent, un assez petit, jet black snake, avec dix-sept grandes, jaune-bor- comme crimson sonne, trouvés dans les États du Sud ; les seuls serpents toxiques des États-Unis sont le hochet-serpents et leurs proches parents, la copperhead et l'eau- mocassin. Ces serpents ont tous une grande tête triangu- lar, et chez le rat- tlesnakes la pointe postérieure du corps est provi- commandés avec un "hochet", com- posé d'une série d'ov en partie

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. The animals and man; an elementary textbook of zoology and human physiology. Zoology; Physiology. THE VERTEBRATES. With the exception of the coral- or bead-snake, a rather small, jet-black snake, with seventeen broad, yellow-bor- dered crimson rings, found in the Southern States; the only poisonous snakes of the United States are the rattle-snakes and their immediate relatives, the copperhead and water- moccasin. These snakes all have a large triangu- lar head, and in the rat- tlesnakes the posterior tip of the body is provi- ded with a "rattle, " com- posed of a series of partly overlapping, thin, horny capsules, or cones, of shape as shown in fig. 109. These horny pieces are simply the somewhat modified, successively formed epidermal cover- ings of the tip of the body, which instead of being entirely moulted as the rest of the skin is, are, because of their pecu- liar shape, loosely attached to one another, and by the basal one to the body of the snake. The number of rattles does not correspond to the snake's years for several reasons, partly because more than one rattle can be added in a year, and es- pecially because rattles are easily and often broken off. As many as thirty rattles have been found on one snake. There are two species of ground-rattlesnakes, or massasaugas, in the United States, and ten species of the true rattlesnakes. The center of distribution of the rattlesnakes is the dry tablelands of the Southwest in New Mexico, Arizona, and Texas. But there are few localities in the United States outside the high mountains in which "rattlers" do not occur, or did not occur before they were exterminated by man. The copperhead is light chestnut in color, with inverted Y- FiG. 109. The rattles of the rattle-snake; the lower figure shows a longitudinal section of the rattle. (Natural size.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc

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