. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 8 BULLETIN 421^ U. S. DEPAETMENT OF AGKICULTUEE. and front of a distinct elevation on top of head between eyes. Head liglit brown with light yellowish longitudinal stripe on each side between eye and ocelli. Maxillary palpi three-segmented, short, small; labial palpi minute. Antennae eight-segmented, slender, nearly three times as long as head; relative lengths of segments as follows: 1234 5 678 5 11 Segment one cylindrical, three-fourths as broad as two, which is barrel-shaped and annulated;
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 8 BULLETIN 421^ U. S. DEPAETMENT OF AGKICULTUEE. and front of a distinct elevation on top of head between eyes. Head liglit brown with light yellowish longitudinal stripe on each side between eye and ocelli. Maxillary palpi three-segmented, short, small; labial palpi minute. Antennae eight-segmented, slender, nearly three times as long as head; relative lengths of segments as follows: 1234 5 678 5 11 Segment one cylindrical, three-fourths as broad as two, which is barrel-shaped and annulated; remaining segments narrower than these two and more elongated; three and four fusiform; seven and eight nearly cylindrical; eight very slender; one, two, and three nearly concolorous, light yellow with tinge of gray or brown on one and two; four and five light yellow in basal half, shading to light brown on apical half; six,. Fig. 7.—Adult female of sugar-beet thrips. Enlarged. (Original.) seven, and eight uniformly chocolate brown; segments two to five annulated; spines slender, light colored. Prothorax transverse, about one-fifth wider than the head, twice as wide as long and shorter than the head; sides rounded; without conspicuously large spines. Mesothorax about one and two-thirds times as wide as the head; anterior angles prominent; meso- notum with deep incision on posterior margin; metanotum with four spines standing in a square near its center. Wings present, long, about one-sixteenth as broad as long; fore wings broadened at base, with two longitudinal veins, the second branching from the first not far from the base of the wing. Spines upon veins of fore wing stout, dark colored, and set at uniform distances; costa bears seventeen to twenty, fore vein fourteen to seventeen, hind vein ten to thirteen, scale three to five besides pair at its tip; spines on basal fourth of wing are light colored, smaller, and much less conspicuous; anterior fringe on both wings fairly
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