. Storia naturale degli animali. Contenente una breve descrizione degli animali figurati sul Tenney di storia naturale compresse, ma completo senza le compresse. Zoologia. 166 SI ARTICOLA: insetti. Mosca di Hesse e frumento volare. La Hessian mio si espande solo circa un quarto di pollice, e ha la testa, le antenne, e torace nero, ali nero- io ho ^^^ ^^^ sfrangiato con peli più corti. Il corpo di cerva è bruno, con nero su ciascun anello, le gambe di colore bruno e piedi neri. Due covate appaiono in un anno, - uno in primavera e uno in au- tumn. Le femmine depongono le loro uova sul giovane lame di frumento, entrambi Fig. 291. -

• Collaboratore: The Book Worm / Alamy Foto Stock
• ID dell’immagine: RDE3H5
• Dimensioni dei file: 7,1 MB (182,6 KB Download compresso)
• Liberatorie: Modello - no | Proprietà - no
• Dimensioni: 1402 x 1782 px | 23,7 x 30,2 cm | 9,3 x 11,9 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.

. Natural history of animals. Containing brief descriptions of the animals figured on Tenney's Natural history tablets, but complete without the tablets. Zoology. 166 ARTICULATES: INSECTS. HESSIAN FLY AND WHEAT FLY. The Hessian My expands only about one fourth of an inch, and has the head, antennae, and thorax black, the wings black- i i ^^^ ^^^ fringed with short hairs. The hind body is tawny, with black on each ring, the legs brownish, and feet black. Two broods appear in a year, — one in spring and one in au- tumn. The females lay their eggs on the young blades of wheat, both Fig. 291. —Hessian ny. in spring and fall. The eggs are only about one fiftieth of an inch in length, pale red, and they hatch in about four days, producing pale red maggots. The larvae immediately crawl down the leaf till they come to a joint. Here they rest a little below the surface of the ground till they have imdergone their transformations. They injure the plant by sucking its sap. The larvae reach their growth in five or six weeks, and are then covered with a hardening brown or chest- nut-colored skin, and the insect is then said to be in the flax-seed state, from its resemblance to a flax-seed. In April and May they complete their transformations, and come forth in the winged state, and soon begin to lay their eggs iipon the spring wheat, and upon that sown the autumn before. The maggots hatched from these eggs pass down the stem as before stated, take the flax- seed form in June or July, and in autunui most of them are transformed into winged insects; others remain through the winter, and are transformed in the spring, as before stated. These flies sometimes move in im- mense swarms in search of fields of their favorite grain where they may lay their eggs. The Hessian Fly re-. 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 t

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1870
• booksubjectzoology
• bookyear1875