Appendix to the Journals of the Senate and Assembly of the ..session of the Legislature of the State of California . The Winged Phylloxera. Fig. 1—Fertile variety, long-bodied; e, young insect with wing-pads. Sterile, short-bodied variety. Fig. 2— From the time it has achieved one third of its growth, the wingpads, or rudimentary wings, are visible. The individuals are moreactive than those of tlie wingless form, and are often seen crawlingabout; finally, in July* and iiugust they shed their last skin, andtake wing. The winged form has neither tubercles nor granules onits back. All are females
Appendix to the Journals of the Senate and Assembly of the ..session of the Legislature of the State of California . The Winged Phylloxera. Fig. 1—Fertile variety, long-bodied; e, young insect with wing-pads. Sterile, short-bodied variety. Fig. 2— From the time it has achieved one third of its growth, the wingpads, or rudimentary wings, are visible. The individuals are moreactive than those of tlie wingless form, and are often seen crawlingabout; finally, in July* and iiugust they shed their last skin, andtake wing. The winged form has neither tubercles nor granules onits back. All are females; a supposed male form, with shorterabdomen, proves to be merely a barren female. The perfect onesdeposit from two to eight eggs where they alight, and then perish. The eggs are of two kinds : the larger, about two hundredths of aninch in length, are of the female sex ; the others, about two fifthssmaller, hatch into males; the time required being about a fortnight. The sexual individuals thus produced are again wingless; morethan that, they are destitute of sucker, mouth, or alimentary canal,being evidentl
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Keywords: ., bookcentury1800, bookdecade1850, bookidappendixtojo, bookyear1853
