Forest entomology . ress-ive term Schildlause (shield-lice). Having often found that intelligent prac-tical men designate scale-insects as a verylow form of life, it may be well to showtheir close relationship with other familieswhich are grouped together in the same sub-order. As in point of structure and life-history they are very closely associated withother families of the sub-order, it may bewell, even at the risk of repetition, to presentthe more salient features of each family asan educational advantage to the clearer dis-crimination of the relationship which existsbetween them. All the
Forest entomology . ress-ive term Schildlause (shield-lice). Having often found that intelligent prac-tical men designate scale-insects as a verylow form of life, it may be well to showtheir close relationship with other familieswhich are grouped together in the same sub-order. As in point of structure and life-history they are very closely associated withother families of the sub-order, it may bewell, even at the risk of repetition, to presentthe more salient features of each family asan educational advantage to the clearer dis-crimination of the relationship which existsbetween them. All the insects of the naturalorder Hemiptera are characterised by thepossession of suctorial mouths, and therefore belondivision of Insecta known as Haustellata. The Aphididae or plant-lice are soft-bodied insects, usually green,with long, rather slender legs, and not formed for leaping. Theyoccur in two forms—winged and wingless. The beak (proboscis), orfeeding-organ, is often very long, and the tarsus two-jointed. One. g. 194.—Cerataphis latanne(fringed aphis) on to horticulturistsas the black-seed scale. to that ereat
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