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CONTENTS.

REPORT

ON THE

INSECTS OF MASSACHUSETTS

INJURIOUS TO VEGETATION.

BY

THADDEUS WILLIAM HARRIS, M. D.

INSECTS

OF

MASSACHUSETTS

INJURIOUS TO VEGETATION.

INTRODUCTION.

INSECT DEFINED. — BRAIN AND NERVES. — AIR-PIPES AND BREATHING-HOLES.

- HEART AND Blood.- INSECTS ARE PRODUCED FROM Eggs. — METAMORPHOSES, OR TRANSFORMATIONS. — EXAMPLES OF COMPLETE TRANSFORMATION. — PARTIAL TRANSFORMATION - LARVA, OR INFANT STATE. — Pupa, OR INTERMEDIATE STATE. – Adult, or WINGED STATE. — HEAD, Eyes, ANTENNE, AND Mouth – THORAX OR Chest, Wings, AND LEGS. - ABNOMEN OR HIND-BODY, PIERCER, AND STING. — NUMBER OF INSECTS COMPARED WITH Plants. – CLASSIFICATION. ORDERS. COLEOPTERA. ORTHOPTERA. HEMIPTERA. NEUROPTERA. LEPIDOPTERA. HYMENOPTERA. DIPTERA. OTHER ORDERS AND GRoups. – REMARKS ON Scientific Names.

The benefits which we derive from insects, though neither sew in number, nor inconsiderable in amount, are, if we except those of the silk-worm, the bee, and the cochenille, not very obvious, and are wholly beyond our influence. On the contrary, the injuries that we suffer from them are becoming yearly more apparent, and are more or less within our control. Before suitable remedies can be discovered, and effectually applied, it is necessary that our insect enemies should be recognised, and their habits generally known. The instructions of His Excellency Governor Everett seemed to point to the economical advantages to be derived from natural history, as the most proper objects of our consideration.

These instructions, together with the nature and extent of the branch of natural history assigned to me, have led me to think that some account of the insects injurious to vegetation in Massachusetts would be acceptable and satisfactory to the governor, and to the people of this Commonwealth.

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