 | Thaddeus William Harris, Massachusetts. Zoological and Botanical Survey - 1841 - 484 páginas
...form. In about ten days they become stationary, and early in June throw out a quantity of bluish white down, soon after which their transformations are completed,...increase of these bark-lice, are birds, many of which, especially those of the genera Parus and Regulus, containing the chickadee and our wrens, devour great... | |
 | 1842 - 554 páginas
...eggs, which are hatched about the beginning of June. The young become stationary in about ten days, and throw out a quantity of bluish-white down, soon after...their transformations are completed, and the females deposit eggs. These insects soon destroy the bark on which they are found, and, unless arrested, will... | |
 | 1842 - 576 páginas
...eggs, which are hatched about the beginning of June. The young become stationary in about ten days, and throw out a quantity of bluish-white down, soon after...their transformations are completed, and the females deposit eggs. These insects soon destroy the bark on which they are found, and, unless arrested, will... | |
 | Cuthbert William Johnson - 1844 - 1210 páginas
...early in June throw out a quantity of bluish white down, soon after which their transformations arc completed, and the females become fertile, and deposit...winter. "Among the natural means which are provided to clieck the increase of these bark-lice, are birds, many of which, especially those of the genera Parus... | |
 | 1850 - 430 páginas
...nearly white, very minute, and nearly oval in form. In about ten days they become stationary, and early in June throw out a quantity of bluishwhite down,...provide for a new brood before the ensuing winter." The time when these insects hatch depends, of course, on the climate or location. Some of tb* insects... | |
 | Thaddeus William Harris - 1852 - 536 páginas
...form. In about ten days they become stationary, and early in June throw out a quantity of bluish white down, soon after which their transformations are completed,...increase of these bark-lice, are birds, many of which, especially those of the genera Parus and Regwlus, containing the chickadee and our wrens, devour great... | |
 | Thaddeus William Harris - 1862 - 676 páginas
...nearly white, very minute, and nearly oval in form. In about ten days they become stationary, and early in June throw out a quantity of bluish-white down,...the summer, and the young come to their growth and proride for a new brood before the ensuing winter. Among the natural means which are provided to check... | |
 | Cuthbert William Johnson - 1869 - 1296 páginas
...form. In about ten days they become stationary, and early in June throw out a quantity of bluish white down, soon after which their transformations are completed,...increase of these bark-lice, are birds, many of which, especially those of the genera Parus and Regulas, containing ihe chickadee and our wrens, devour great... | |
 | New York State Museum of Natural History - 1888 - 444 páginas
...about ten days the young become stationary, and early in June throw out a quantity of bluish- white down, soon after which their transformations are completed,...provide for a new brood before the ensuing winter. (Insects Injurious to Vegetation, 1862, p. 253.) Prof. Eiley has had the insect reported to him as... | |
 | 1842 - 558 páginas
...eggs, which are hatched about the beginning of June. The young become stationary in about ten days, and throw out a quantity of bluish-white down, soon after...their transformations are completed, and the females deposit eggs. These insects soon destroy the bark on which they are found, and, unless arrested, will... | |
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They begin to hatch about the 25th of May, and finish about the 10th of June, according to Mr. Perley. The young, on their first appearance, are nearly white, very minute, and nearly oval in form. In about ten days they become stationary, and early in... 