. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BLISTER BEETLES IN KAXSAS. 19 particular part of the country at irreg:ular intervals, and there are periods or years of absolute immunity from their presence in the same regions. The young blister-beetles that hatch the j-ear following the advent of the locusts in immense numbers may frequently find few or no locust eggs upon which to prey, and the great bulk of them would, as a consequence, porisli; while the young from such exceptional as should not develop till two. three, or more years after a locust i
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BLISTER BEETLES IN KAXSAS. 19 particular part of the country at irreg:ular intervals, and there are periods or years of absolute immunity from their presence in the same regions. The young blister-beetles that hatch the j-ear following the advent of the locusts in immense numbers may frequently find few or no locust eggs upon which to prey, and the great bulk of them would, as a consequence, porisli; while the young from such exceptional as should not develop till two. three, or more years after a locust invasion ndght stand a much better chance of finding appropriate food and of thus perpetuating the species. In this case and in most other cases of retarded development with which we are familiar, the exceptional retardation may and does become a benefit to the species, enabling it to bridge over periods of adversity. And we can see how, by the preservation of such favored individuals, the habit of irregular development may have become fixed in the species as a consequence of surrounding con- ditions and circumstances which render 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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