Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] 27o ECONOMIC ZOOLOGY AND ENTOMOLOGY the snake strikes, these fangs are lowered and thrust into the victim and the poison, which is secreted by small glands in the head, is injected through them. There are several species of rattlesnakes, all belonging to the genus Crotalus, They are most abundant in the Southwest, but are found in almost all parts of the United States except in the higher mountains. The rattle on the tail is composed of a series of partly overlap- ping thin horny pieces, the somewhat
Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] 27o ECONOMIC ZOOLOGY AND ENTOMOLOGY the snake strikes, these fangs are lowered and thrust into the victim and the poison, which is secreted by small glands in the head, is injected through them. There are several species of rattlesnakes, all belonging to the genus Crotalus, They are most abundant in the Southwest, but are found in almost all parts of the United States except in the higher mountains. The rattle on the tail is composed of a series of partly overlap- ping thin horny pieces, the somewhat modified successively formed epidermal coverings of the tip of the body. A new rattle is added each time the snake sheds its skin, and as the snakes usually molt about three times a year the age of a rattlesnake may be approximately estimated provided none of the terminal units of the rattle has been lost.
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