. The horse-radish flea-beetle : its life history and distribution . ollowing is a list of localities in which nai*rSe n§> the horse-radish flea-beetle is known to occur inNorth America. (Fig. 6.) This list is given in approximate orderof the first noted appearance of the insect, with the name of the col-lector in each case: Chicago, 111., 1893 (Chittenden). Guttenberg, Iowa, 1894 (Hugo Soltau). Okauchee, Wis., 1896 ( E. G. Love). Dane County, Wis., 1900 (Dr. Wm. S. Marshall). Bloomington, McLean County, 111., 1900 (Wolcott). Glencoe, 111., 1908 (J. E. Fehd). Milwaukee County, Wis., 190
. The horse-radish flea-beetle : its life history and distribution . ollowing is a list of localities in which nai*rSe n§> the horse-radish flea-beetle is known to occur inNorth America. (Fig. 6.) This list is given in approximate orderof the first noted appearance of the insect, with the name of the col-lector in each case: Chicago, 111., 1893 (Chittenden). Guttenberg, Iowa, 1894 (Hugo Soltau). Okauchee, Wis., 1896 ( E. G. Love). Dane County, Wis., 1900 (Dr. Wm. S. Marshall). Bloomington, McLean County, 111., 1900 (Wolcott). Glencoe, 111., 1908 (J. E. Fehd). Milwaukee County, Wis., 1908 (Dr. S. Graenicher). Whitewater, Wis., 1909 (Univ. Wis. Coll.). Westmount, Quebec, 1910 (A. F. Winn). Lake County, Inch, 1910 (Wolcott), (Blatchley). Shermerville, 111., 1912 (Retzinger). Chester, N. J., 1913 (H. O. Marsh). Green Bay, Wis., 1914 (J. G. Sanders), 1915 (N. F. Howard). Highland Park, Mich., 1915 (L .Miller). Omaha, Nebr., 1915 (Ehlers). Potsdam, N. Y., 1915 (Chas. Dury). Ashtabula County, Ohio, 1915 (Robt. Sim). Madison, Wis., 1916 (N. F. Howard).. 6 BULLETIN 535, U. S. DEPARTMENT OF AGRICULTURE. ORIGIN AND DISSEMINATION. The horse-radish flea-beetle is of European origin, and was firstdescribed by Koch in 18031 from Germany. It is a well-knownspecies in the Old World, and its specific name is derived from itsfavorite food plant (Nasturtium) Radicula armoracia. Like all ofthe striped flea-beetles of the true genus Phyllotreta, the presentspecies breeds on cruciferous plants. As to the means of introduction of this species in the heart of thiscountry, it was probably brought in with horse-radish and less prob-ably in marsh cress (Radicula palustris), or possibly with somepotted plant. It is not impossible that these plants were brought toAmerica expressly on account of, if not actually for, exhibition at
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