. Nature-study; a manual for teachers and students. Nature study. TYPICAL IXSFXTS 187 chitin. It is the hardened epidermis of the insect. To per- mit the insect knight to move in his coat of mail, it is made in sections united by flexible bands similar to the jointed mail of old; and, as witli human armor, so liere the vulnerable spot is between the plates at the flexible meml^ranes. This is where a wasp would insert her dagger. The abdomen of the grasshopper is divided into ten ring segments, that fit together with flexible joints. On each side of a segment is a small pit or breath- ing pore.
. Nature-study; a manual for teachers and students. Nature study. TYPICAL IXSFXTS 187 chitin. It is the hardened epidermis of the insect. To per- mit the insect knight to move in his coat of mail, it is made in sections united by flexible bands similar to the jointed mail of old; and, as witli human armor, so liere the vulnerable spot is between the plates at the flexible meml^ranes. This is where a wasp would insert her dagger. The abdomen of the grasshopper is divided into ten ring segments, that fit together with flexible joints. On each side of a segment is a small pit or breath- ing pore. These pores commu- nicate with a complete system of air-tubes that branch throughout the body, even into the veins of the wings. They are the lung; of the insect. Observe a grass hopper breathing. Note how the abdomen expands and contracts By a muscular exertion the air is expelled, and the natural elasticity of the body-wall causes it to expand and draw in the air. The end of the abdomen of the female grasshopper has a forked appearance, on account of the projecting lobes. This arrangement is the egg-placer, or ovipositor, with which the female bores a hole in the ground and deposits her eggs in the burrow. The male's abdomen is blunt and round. The fact that some insects, like the cricket, the grasshopper, and others, possess a call or "song" argues that there is a receptive organ for the sound. The ears, or hearing organs, of some insects have been located. The ear of the grass- hopper may be found by hfting up the wings and looking at. Fig. 4' Breathing Fore of a Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons
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