. Elements of zoology, or, Natural history of animals / ed. by Reese. Zoology. ORDER THYSANOURA. 385 Some of them possess as complex an oral apparatus as the mandibulate insects ; whilst in others there is scarcely a perceptible opening. The same is the case with regard to the eyes, these organs being fully developed in some, and almost rudimentary in others. The order contains two families. In the first, the LepismidtE, the abdomen is furnished on each side with a row of movable appen- dages like false legs, and is terminated by long-jointed bristles, of which three are more remarkable.
. Elements of zoology, or, Natural history of animals / ed. by Reese. Zoology. ORDER THYSANOURA. 385 Some of them possess as complex an oral apparatus as the mandibulate insects ; whilst in others there is scarcely a perceptible opening. The same is the case with regard to the eyes, these organs being fully developed in some, and almost rudimentary in others. The order contains two families. In the first, the LepismidtE, the abdomen is furnished on each side with a row of movable appen- dages like false legs, and is terminated by long-jointed bristles, of which three are more remarkable. These little insects leap very well; some frequent stony places, whilst an- other is found in sugar, and is known as the sugar-louse. In the Podurid,e, the appendages to the sides of the abdomen are wanting ; but the extremity of it is prolonged Podura Villosa- into a forked tail, by which these insects can execute very surprising leaps ; this, when in inaction, is applied against the belly. From this conformation they are popularly known under the name of Spring-tails. Some species are found upon trees and plants, others beneath stones, and some have been seen on the snow itself at the time of a thaw. Many, residing upon the earth or in sandy places, unite into numerous societies, and resemble at a distance a small quantity of gunpowder. The scales of the insects of both these families are extremely beautiful microscopic objects ; those of the latter require a very high power and good adjustment to exhibit their delicate mark- ings ; and hence are employed as test-objects. 685. What of the next and last order ? 686. What different species are named ? 687. Describe this distinct class. 688. How are they distinguished from insects t. 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 Reese, David Meredith, 1800-
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