. Una dissertazione su alcuni degli insetti dannosi per la vegetazione . Pesti di insetto. Il TITYRUS SKIPPER. 311 talmente grande che non può essere catturato senza pericolo del suo essere fortemente danneggiato nelle sue lotte per sfuggire. Le femmine depongono le loro uova, singolarmente, sulle foglie del comune- Locust Tree (Rohinia pseudacacia), e su quelle del viscoso locust (Mobinia viscosa), che è molto coltivata qui come un albero ornamentale. I bruchi sono covate in luglio e quando abbastanza piccola nascondono sotto una piegatura del bordo di una foglia che è incurvata oltre i loro corpi e fissata per mezzo del silken thread.

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. A treatise on some of the insects injurious to vegetation . Insect pests. THE TITYRUS SKIPPER. 311 so great that it cannot be captured without danger of its being greatly defaced in its struggles to escape. The females lay their eggs, singly, on the leaves of the common locust- tree (Rohinia pseudacacia), and on those of the viscid locust (Mobinia viscosa), which is much cultivated here as an ornamental tree. The caterpillars are hatched in July, and when quite small conceal themselves under a fold of the edge of a leaf, which is bent over their bodies and secured by means of silken threads. When they become larger they attach two or more leaves together, so as to form a kind of cocoon or leafy case to shelter them from the weather, and to screen them from the prying eyes of birds. The full- grown caterpillar (Fig. 133), which mg. m attains to the length of about two inches, is of a pale green color, trans- versely streaked with darker green, with a red neck, a very large head roughened with minute tubercles, slightly indented or furrowed above, and of a dull red color, with a large yellow spot on each side of the mouth. Although there may be and often are many of these caterpillars on the same tree and branch, yet they all live separately within their own cases. One end of the leafy case is left open, and from this the insect comes forth to feed. They eat only, or mostly, in the night, and keep themselves closely concealed by day. These caterpillars are very clean- ly in their habits, and make no dirt in their habitations, but throw it out with a sudden jerk, so that it shall fall at a consider- able distance. They frequently transform to chrysalids within the same leaves which have served them for a habitation, but more often quit the trees and construct in some secure place a cocoon (Fig. 134) of leaves or fragments of stubble, the interior of which is lined with a loose web Hg. 184.. Please note that these images are extracted from scanned page images that may

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1860
• bookpubl
• booksubjectinsectpests