Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] SNAKES, LIZARDS, TURTLES, AND CROCODILES 269 ground squirrels or other pests. The blind snakes, genus Glaucoma, burrow in the earth and feed on insect larvae and worms. Among the most familiar of the many non-poisonous snakes are the striped garter-snakes, genus Thamnophis, found every- where in the fields and gardens. The common water-snake, genus Natrix, is only semi-aquatic, spending most of the time on land in the vicinity of ponds or streams. They are ex- cellent swimmers and quickly take to the
Elementary textbook of economic zoology and entomology . elementarytextbo00kell Year: [c1915] SNAKES, LIZARDS, TURTLES, AND CROCODILES 269 ground squirrels or other pests. The blind snakes, genus Glaucoma, burrow in the earth and feed on insect larvae and worms. Among the most familiar of the many non-poisonous snakes are the striped garter-snakes, genus Thamnophis, found every- where in the fields and gardens. The common water-snake, genus Natrix, is only semi-aquatic, spending most of the time on land in the vicinity of ponds or streams. They are ex- cellent swimmers and quickly take to the water when alarmed. The large blacksnake, Zamenis constrictor, and the blue-racer, FIG. 123.—A king-snake, Lampropeltis boyli. (After Snyder.) which is merely a color variety of the same species, are common in open meadows, where they feed on frogs, mice, eggs, young birds and other animals which they swallow alive. The king-snakes, genus Ophibolus, are so called because they feed on other snakes. They seem to be immune to the venom of the poisonous snakes and readily attack any of them. The puff- adders, or spreading vipers, or blow-snakes, genus Hetcrodon, are commonly supposed to be poisonous but are really quite harmless. No American snake with slender, sub-parallel- sided head is poisonous. The dreaded rattlesnakes, and the copperheads and water- moccasins, are thick-bodied venomous snakes with flat, tri- angular heads and with strong tubular fangs which are folded flat against the roof of the mouth when it is closed. When
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