. Bulletin. Natural history; Natural history. 130 Illinois Natukal History Survey Bulletin- Life Histories Aphids have so many and varied ways of existence that no one generaHzed account can cover all of their interesting and often com- plicated life histories. Information about the life historj' of a species all too often begins and ends on a given host, leaving us in complete ignorance of the events transpiring between the time in the spring or early summer when the species leaves the host upon which it over- winters and the time when it returns to the same host again in the fall after a sum
. Bulletin. Natural history; Natural history. 130 Illinois Natukal History Survey Bulletin- Life Histories Aphids have so many and varied ways of existence that no one generaHzed account can cover all of their interesting and often com- plicated life histories. Information about the life historj' of a species all too often begins and ends on a given host, leaving us in complete ignorance of the events transpiring between the time in the spring or early summer when the species leaves the host upon which it over- winters and the time when it returns to the same host again in the fall after a summer's sojourn upon some unknown host. Thus in the past, and even now perhaps, it has happened that a species of plant louse was known by one name when taken on its winter (primary ) host and by another name when taken on its summer (secondary) host. This has been particularly true of those migrator}- species in which structural differences exist between the various forms of the same species, and it. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
