. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. 314 Handbook of Nature-Study through them the air passes into the insect's body. The number of spiracles varies greatly in different insects. There is, however, never more than one pair on a single segment of the body, and they do not occur on the head. The spiracles, or breathing pores, lead into a system of air tubes which are called tracheae (tra'-ke-ee), which permeate the insect's body and thus carry the air to every smallest part of its anatomy. The blood of the insect bathes th
. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. 314 Handbook of Nature-Study through them the air passes into the insect's body. The number of spiracles varies greatly in different insects. There is, however, never more than one pair on a single segment of the body, and they do not occur on the head. The spiracles, or breathing pores, lead into a system of air tubes which are called tracheae (tra'-ke-ee), which permeate the insect's body and thus carry the air to every smallest part of its anatomy. The blood of the insect bathes these thin-walled air tubes and thus becomes purified, just as our blood becomes purified by bathing the air tubes of our lungs. Thus, although the insects do not have localized breathing organs, like our lungs, they have, if the expression may be permitted, lungs in every part of their little bodies. ..T/to rax Abtla ^.^7L. Prop leg True leg's â -V Pro legs Spifades on Breathing- pot-es The sphinx caterpillar, with the parts of the external anatomy named. Head Thorax Abdomen Summary of Structure of o,n Insect Antennae. Compound eyes. Simple eyes or ocelli. I^abrum, or upper lip. Mandibles, or upper jaws. Maxillae, or lower jaws, and maxillary palpi. Labium and labial palpi. Prothorax and first pair of legs. second pair of legs, first pair of wings, third pair of legs, second pair of wings, veins, cells. Two small segments called coxa and trochanter. Femur. Tibia. Tarsus and claws, ears (in locusts only), spiracles, ovipositor. Manual for the Studyof Insects and Insect Life, Comstock. Mouth-parts Mesothorax and Metathorax and Wing Leg The abdomen bears. 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 Comstock, Anna Botsford, 1854-1930. Ithaca, N. Y. , Comstock Publishing Company
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