. Elements of zoölogy. Zoology. INSECTS. 123 (Ptyelus) is common in the grass in early summer. When hatched, the young crawl up blades of grass, puncture them with their mouths, and suck the juice, a watery fluid escaping from various pores of the insect and completely covering it. To obtain air, its tail is thrust through the fluid (Fig. 150, a), seizing a bubble by means of claspers, that passes along beneath the abdomen, entering the spi- racles. After a time the liquid becomes filled with air, by and assumes the frothy appearance familiar as frog- spittle, from which the perfect insect fin
. Elements of zoölogy. Zoology. INSECTS. 123 (Ptyelus) is common in the grass in early summer. When hatched, the young crawl up blades of grass, puncture them with their mouths, and suck the juice, a watery fluid escaping from various pores of the insect and completely covering it. To obtain air, its tail is thrust through the fluid (Fig. 150, a), seizing a bubble by means of claspers, that passes along beneath the abdomen, entering the spi- racles. After a time the liquid becomes filled with air, by and assumes the frothy appearance familiar as frog- spittle, from which the perfect insect finally escapes. Bark-Lice ( Cocci dee).—T h e bark-lice are mi- nute scale-like in- sects, the males alone having wings. The cochineal (Fig. 151) is a fa- miliar form of the family. Value.—The coch- ineal industry gives em- ployment to thousands of persons. From Coc- cus siensis comes wax ; 400,000 pounds have been obtained in a sin- gle year, and made into candles, Fig. 151 -t, Cochineal insects on a branch of cactus; 2, female ; 3, male. Plant-Lice (Aphidai)— These insects (Fig. 152) have flask-shaped bodies and a three-jointed beak. They mul- tiply in a marvelous manner. Eggs are deposited by the impregnated female in the autumn that hatch in the spring, producing, as a rule, wingless forms, that in turn produce not eggs but living winged or wingless young, that in ten or eleven days produce others, and so on, so that the origi-. 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 Holder, Charles Frederick, 1851-1915; Holder, Joseph Bassett, 1824-1888, joint author. New York : D. Appleton and company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
