Guida per lo studio di insetti e di un trattato di quelle pratiche pregiudizievoli e benefica per colture: per l'uso di istituti, fattoria-scuola, e agricoltori . 538, punc-tured ramoscello; Fig. 539, un ramoscello che ha beenFUv;s-forato e poi guariti oltre). La larva- hatchout in circa sei settimane dopo che queste sono stabilite e (Fig.540, recentemente larva tratteggiata) cada a terra incui vivono l'alimentazione sulle radici di alberi per nearlyseventeen anni la pupa stato (Fig. 537 ; (/, h, castpupa e pelle; r, adulto) durature ma pochi da vs.quando circa a trasformare in alato thevascend dello stato di superficie rendendo cylind

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Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . 538, punc-tured twig; Fig. 539, a twig which has beenFUv;s-punctured and then healed over). The larva- hatchout in about six weeks after they are laid, and (Fig.540, newly hatched larva) drop to the ground inwhich they live feeding on roots of trees for nearlyseventeen years, the pupa state (Fig. 537 ; (/, h, castpupa and skin; r, adult) lasting but a few da vs.When about to transform into the winged state thevascend to the surface, making cylindrical burrows, •firmly cemented and varnished so as to be water-Fig. 539. proof. Mr. S. , S. Rathvon has observed that in low and wet localities the pupie extend these galleries from four to six inches above ground (Fig. 541 ; a, full view ; /;, section) leaving an orifice of egress even with the surface (c). In the upper end of these chambers (c) the pupa- would be found awaiting their approaching time of change. They would then back down to below the level of the earth, as at d, and issuing forth from the orifice would attach themselves to. 536 HEMIPTERA. ihe first object at hand, and imdergo their transformationsin the usual manner. (American Entomologist, p. 64.) The ovipositor of Cicada, as we have observed it in a rudi-mentary state in the pupa, closely resembles that oi ^•Eschnii(Fig. 21), and essentially agrees with that of Bombns, thebasal pair of blades arising from the eighth segment of the ab-domen, as in the humble bee, and the two succeeding pairsforming the ovipositor itself (the outer pair forming a sheath)arising from the ninth segment. NOTONKCTID.K Lritveille. The Water Boatmen somewhatresemble the Tettigoni;e, but their habits are aquatic; their hind legs are very long, ciliated, and formed forswimming. The body-7 is convex above, but flat beneath; the head islarge and nearly as wi li-as the rest of the body, with a broad and round-ed front ; the antennaare f

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1870
• bookpublishe
• booksubjectinsects