Manual of vegetable-garden insects . Ent. Bull. 82, pp. 1-8. and Zetek, Ann. Ent. Soc. Am., 4, pp. 71-83. Truck Exp. Sta. Bull. 14. and Ballinger, Jour. Agr. Research, 5, pp. 917-925. 1916. The Three-Lined Potato Beetle Lema trilineata 01i\ier Throughout the United States and Canada east of the RockyIMountains, potatoes and tomatoes are sometimes attackedby the larvie of a ycHowish leaf-beetle (Fig. 86) about \ inch inlength. The head and thorax arereddish yellow, the latter constrictedat the middle and usually marketlwith two black spots. The wing-covers are
Manual of vegetable-garden insects . Ent. Bull. 82, pp. 1-8. and Zetek, Ann. Ent. Soc. Am., 4, pp. 71-83. Truck Exp. Sta. Bull. 14. and Ballinger, Jour. Agr. Research, 5, pp. 917-925. 1916. The Three-Lined Potato Beetle Lema trilineata 01i\ier Throughout the United States and Canada east of the RockyIMountains, potatoes and tomatoes are sometimes attackedby the larvie of a ycHowish leaf-beetle (Fig. 86) about \ inch inlength. The head and thorax arereddish yellow, the latter constrictedat the middle and usually marketlwith two black spots. The wing-covers are reddish yellow and markedwith three black stripes. The an-tennae are black, except the base,and the legs are reddish yellowwith the outer half of the tibia?and tarsi black. A closely relatedspecies, Lema nigrocittata Guerin-Meneville, occurs in California; bysome it is considered identical with the eastern species. The three-lined potato beetle probably hibernates in theadult condition, the beetles appearing in early spring. They. Fig. SG. — The three-linedpotato beetle (X 3^). 150 MANUAL OF VEGETABLE-GARDEN INSECTS feed at first on various wild plants, preferring solanaceousweeds. As soon as potato and tomato plants are available,the beetles migrate to them and deposit their eggs usually onthe underside of the leaves in clusters of six to ten. Eachegg is about -j^ inch in length, smooth, oval and yellowishin color. The eggs hatch in about two weeks and the younglarvae at first feed in a row side by side, beginning at the edgeof the leaf and moving backward as they devour the mature the larva is about ^ inch in length with the head,thoracic shield and legs black and the body yellowish. Thebody of the larva is kept moist and sticky by a secretion andis usually covered with a coating of excrement. The grubsbecome full-grown in about two weeks and then enter the groundwhere they construct earthen cells lined with a gelatinoussecretion from the mouth. The pupal perio
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