. Bulletin of the Department of Agriculture. Agriculture. THE HORSE-RADISH FLEA-BEETLE. 5 third row four; at the ends of the third row, a little anterior, are the slightty elevated chitinous pleural plates, bearing three setae each. The anal plate approximates a rectangle in outline with the sides converging toward the posterior end and corners rounded. The whole surface except the chitinous plates is covered with minute granulations. The length just prior to pupation is mm., the width mm. THE PUPA. The pupa (fig. 5) is white and about the same size as the mature beetle. The anten
. Bulletin of the Department of Agriculture. Agriculture. THE HORSE-RADISH FLEA-BEETLE. 5 third row four; at the ends of the third row, a little anterior, are the slightty elevated chitinous pleural plates, bearing three setae each. The anal plate approximates a rectangle in outline with the sides converging toward the posterior end and corners rounded. The whole surface except the chitinous plates is covered with minute granulations. The length just prior to pupation is mm., the width mm. THE PUPA. The pupa (fig. 5) is white and about the same size as the mature beetle. The antennae are placed along the dorsal margin of the wings and extend around on the ventral side about one-half way to the middle of the body. Between the wings, which extend down to the fourth abdominal segment, is a narrow space in which the tarsi of the three pairs of legs are placed. The femora and tibiae of the anterior pairs of legs are parallel and extend transversely across the body over the wings, while these parts of the posterior pair of legs extend obliquely and are under the wings, the tips being just visible. Two forceps-like chitinous processes occur at the apex or tip of the last abdominal segment; a stout seta on the tip of each femur, and a number of seta3 at various points on the head and body. fig. 5.—Vhe horse- radish flea-beetle : DISTRIBUTION IN NORTH AMERICA. Pupai ventrai view. The following is a list of localities in which ^ "gl the horse-radish flea-beetle is known to occur in North America. (Fig. 6.) This list is given in approximate order of the first noted appearance of the insect, with the name of the col- lector in each case: Chicago, 111., 1893 (Chittenden). Guttenberg, Iowa, 1S94 (Hugo Soltau). Okauehee, Wis., 1896 (Dr. E. G. Love). Dane County, Wis., 1900 (Dr. Win. S. Marshall). Bloomington, McLean County, 111., 1900 (Wolcott). Glencoe, 111., 1908 (J. E. Fend). Milwaukee County, Wis., 1908 (Dr. S. Graenicher). Whitewater, Wis., 1909 (Univ
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