. Relazione annuale - Società Entomologica di Ontario. Società Entomologica di Ontario; pesti di insetto; gli insetti. 30 Amazon. In questi casi le migrazioni può forse essere collegato con la questione di cibo o di la continuazione della specie. Una farfalla che è ben noto in Canada e che dispone di una gamma molto ampia, è nota per le sue abitudini migratorie; è il Danais archippus (fig. 12). Difficilmente una stagione passa. Fig. 12. ma abbiamo letto delle sue migrazioni. Quotidiani nel sudovest membri e il segnale meteo ufficiali, sono stati costantemente segnalato il passaggio al di sopra dello Iowa, del Kansas, del Missouri e del Texas

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. Annual report - Entomological Society of Ontario. Entomological Society of Ontario; Insect pests; Insects. 30 Amazon. In these cases migrations may perhaps be connected with the question of food, or of the continuance of the species. A butterfly which is well known in Canada, and which has a very wide range, is noted for its migratory habits; it is the Danais archippus (fig. 12). Hardly a season passes. Fig. 12. but we read of its migrations. Newspapers in the Southwestern States, and the weather signal officers, were constantly reporting the passage over Iowa, Kansas, Missouri and Texas of swarms of this butterfly during the months of September and October last. Even in Canada they are sometimes seen in great numbers on their way either north or south. I myself have seen the shore of Lake Ontario, near Brighton, strewn with hun- dreds of their dead bodies, cast up by the waves, and which no doubt had formed part of a swarm which from weakness or some other cause had perished while flying across the lake. Mr. Riley gives an interesting account of the causes which may lead to the migra- tions of this butterfly in his third report. He says :—" It would be difficult to give any satisfactory reason for this assembling together of such swarms of butterflies. As I have abundantly proved by examination of specimens, the individuals composing the swarms of our Archippus butterfly comprise both sexes ; if anything the females^ prevail. The flights almost always occur in the autumn, when the milk-weeds (Asclepias), upon which the larva of this butterfly feeds, have perished. The instinct to propagate is, therefore, at the time in abeyance. The butterflies, unable to supply themselves with sweets from flowers, are either attracted in quantities to trees that are covered with honey-secreting plants, or bark lice ; or else they must migrate southward, where flowers are still blooming. The Archippus butterfly hibernates within hollow trees and other sheltered situations.

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1870
• booksubjectinsects
• bookyear1872