. Bulletin of the Department of Agriculture. Agriculture. THE ALFALFA CATERPILLAR. ECONOMIC HISTORY OUTSIDE THE BORDERS OF ARIZONA AND CALIFORNIA. In regions outside of Arizona and California this species has at various times been suspected, both by agents of the Bureau of Ento- mology and others, of doing more or less injury to alfalfa. In 1906 a correspondent of the Department of Agriculture reported the cater- pillars as infesting lucerne fields in Brigham County, Wyo. In the same j^ear another correspondent, writing from Dell, Oreg., reported the butterflies in " countless thousa
. Bulletin of the Department of Agriculture. Agriculture. THE ALFALFA CATERPILLAR. ECONOMIC HISTORY OUTSIDE THE BORDERS OF ARIZONA AND CALIFORNIA. In regions outside of Arizona and California this species has at various times been suspected, both by agents of the Bureau of Ento- mology and others, of doing more or less injury to alfalfa. In 1906 a correspondent of the Department of Agriculture reported the cater- pillars as infesting lucerne fields in Brigham County, Wyo. In the same j^ear another correspondent, writing from Dell, Oreg., reported the butterflies in " countless thousands playing on the alfalfa ; In 1909 Mr. C. N. Ainslie found eggs and larvae on alfalfa at Springer, N. Mex., but not in sufficient numbers to be doing any ap- parent damage. In July, 1913, on nearly the same ground, the writer found larvse quite abundant. It is apparent that the reason Mr. Ainslie did not find m^ m. Fig. -Map showing distribution of the alfalfa caterpillar. (Original.) them in numbers was the lateness of the season. In the same year, 1909, Mr. E. O. G. Kelly, at Wellington, Kans., reported the larvae as rather numerous on alfalfa plants and feeding freely; and the following year, at the same place, Messrs. T. H. Parks and H. T. Osborn observed the larvee feeding upon alfalfa, and reared parasites therefrom. In 1910 Mr. R. A. Vickery, at Brownsville, Tex., reported the species as being abundant in the alfalfa fields as late as November. He states: " These larvse are the most numerous and injurious of the several species of caterpillars that are injuring alfalfa ; In the summer of 1911 the species was found in a number of locali- ties, and reported by diiferent members of the Bureau of Entomology as injuring alfalfa at the following places: Cokeville, Wyo., Idaho Falls and Blackfoot, Idaho (T. H. Parks) ; Ely, Nev. (C. N. Ainslie). In July, 1911, Prof. S. B. Doten, of the Nevada Agricul- tural College, received from The H. F. Dangberg
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