Prima lezione di zoologia : adatta per l'uso nelle scuole . t'astice respira dalle branchie theoutside del corpo. Con gli insetti tutto questo è cambiato.Tuttavia non disegnare in aria attraverso theirmouth, ma lo inalano attraverso minuto aperture sui lati del torace e hind corpo. Ci sono in the locust tenpairs di questi fori o spiracles; due coppie sul tho-rax e il resto sui lati dell'addome. All difficile da trovare in un primo momento, ma può essere rilevata con la aidof Fig. 98, dove essi sono chiaramente evidenziate. Lafascetta entra in questi fori, ed è trasportato in tutto il corpo byair-vasca

• Collaboratore: The Reading Room / Alamy Foto Stock
• ID dell’immagine: 2AKWTGX
• Dimensioni dei file: 7,1 MB (502,4 KB Download compresso)
• Liberatorie: Modello - no | Proprietà - no
• Dimensioni: 1828 x 1366 px | 31 x 23,1 cm | 12,2 x 9,1 inches | 150dpi

Altre informazioni

Questa foto è un'immagine di pubblico dominio, il che significa che il copyright è scaduto o che il titolare del copyright ha rinunciato a tale diritto. Alamy addebita un costo per l'accesso alla copia ad alta risoluzione dell'immagine.

Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.

First lesson in zoology : adapted for use in schools . t the lobster breathes by gills on theoutside of the body. With insects all this is changed.They do not, however, draw in the air through theirmouth, but inhale it through minute openings on the sideof the chest and hind body. There are in the locust tenpairs of these holes or spiracles; two pairs on the tho-rax, and the remainder on the sides of the abdomen. Theyare hard to find at first, but may be detected with the aidof Fig. 98, where they are distinctly pointed out. Theair enters these holes, and is carried all over the body byair-tubes, which are fine chitinous tubes, kept open by aseries of short elastic spiral thickenings, the tubes beingenveloped by the tracheal hypodermis. Z0CIT8TS AND QRASSaOPPBBS. 97 In collecting grasshoppers one often finds the youngwhich are without wings, and others with wings just be-ginning to grow out. It will be seen, then, that the younggrasshopper differs only from the old ones by having nowings. There is no great change, such as marks the lif e-. Fio. 103.—Eocky-Mountain locust laying its eggs (c) one by one, forming an ovalmass (e). (All natural size.)—Mter Riley. history of a butterfly. Perhaps it is by reason of their in-complete metamorphosis, the general uniformity of theirhabits, and their living on vegetable food, that Orthopteraare not numerous in species compared with the beetles andhigher orders. The locusts and grasshoppers laytheir eggs in packets in the ground(Fig. 103). With its ovipositor, which is made up of three pairs ofspines, the two outer pairs very largeand stout, the locust thrusts its hindbody deep into the earth and depositsits eggs one after another. Many dangers attend the life ofthese insects. To overcome or toavoid them, many kinds, as certainkatydids, the leaf-insects (Fig. 104), and stick-insects, 7

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1890
• booksubjectzoology
• bookyear1894