. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. 346 THE AGRICULTURAL NEWS. October 30, 1909. INSECT NOTES. NATURAL HISTORY OF INSECTS. Part I. Intkoduutiox The animal kingdom is divided into great groups, or sub-kingdoms, in each of which tlie members have some points in common. The cf ' gi-ou[H have more i>oints of difference than of likeness. iivfu t!i'; name better, :\rlhro- jiiinted One of these grou[)3 has bee jjoda which means ' jointed feet ', or perlun limbs '. The arthropods are all alike in having j'unted limbs, and they a
. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. 346 THE AGRICULTURAL NEWS. October 30, 1909. INSECT NOTES. NATURAL HISTORY OF INSECTS. Part I. Intkoduutiox The animal kingdom is divided into great groups, or sub-kingdoms, in each of which tlie members have some points in common. The cf ' gi-ou[H have more i>oints of difference than of likeness. iivfu t!i'; name better, :\rlhro- jiiinted One of these grou[)3 has bee jjoda which means ' jointed feet ', or perlun limbs '. The arthropods are all alike in having j'unted limbs, and they also have other points of likeness. They have bodies that are jointed, or at least that are easily separable into regions or sections, such as head, thorax (the middle body) and abdomen ; or head and hind-body ; or cephalothorax, head and thorax fused together, and abdomen. Arthropod.* have an of a hard, substance, known as chitin, to which muscles are attached on the inside, and which protects all the soft and delicate organs. The arthropods in their turn are divided into four classes as follows : — Crustacea—Crabs, Lobsters, etc. Araneida—Spiders, Mites, Scorpions, etc. ^[yriapoda—Centipedes, Millipedes, etc. Hexapoda—Insects. Crustacea are to be included crabs, lobsters, shrimps, barnacles, etc., many of which are familiar objects in most parts of the West Indies. Fig. 38 represents the wood- louse, or sow-bug, one of the crustaceans. The crustaceans are mostly aquatic; a few live in damp situations such as damp soil"or decaying vegetable matter. They breathe by Class I. „ II. „ III. „ IV. Among the. Eig. 38. Wood-louse. Fig. 39. Red Spiuki;. means of gills, the head is provided with two pairs of antennae, the abdomen has appendages which are used in locomotion, and the eyes are usually compound, sometimes stalked. The body is divided into two regions, the cephalo- thorax and the abdomen. The cei)halolhorax is composed of the head and t
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