PEA AND BEAN INSECTS 85 



appearance. The chrysalis is naked, and han^^s freely, at- 

 tached at the caudal end to a button of silk. The pupal 

 period lasts from ten days to two w^eks. In the North 

 there are two, and in the South, three broods annually. 



If necessary, the caterpillars may readily be controlled by 

 spraying with an arsenical. 



References 



Scudder, Butterflies of Eastern U. S., 2, pp. 850-855. 1889. 

 U. S. Div. Ent. Bull. 33, pp. 101-102. 1902. 



The Green Clover Worm 



Plathypena scabra Fabricius 



This insect is common throughout the eastern United States 

 and Canada. Its favorite food plant is clover but occasionally 

 the caterpillars defoliate peas, beans and lima beans. They 

 are also found on tickweed, soybeans, vetch and strawberry. 



The moths have an expanse of 1 to 1-^ inches, the larger 

 specimens usually being males. The palpi form a rather 

 prominent snout. When at rest, the wings are closely ap- 

 pressed to the body. The front wings are blackish brown, 

 the outer part of the wing in the female shaded with light gray 

 and often with brown. The wing is crossed near the middle 

 by a fine black line which is wavy and often very faint on the 

 front half but straight and composed of raised black scales on 

 the posterior half. At one quarter and at three quarters the 

 distance from the base of the wing is a fainter wavy dark line 

 and at one third the distance a raised black dot. Some females 

 are marked with one or two longitudinal black dashes. The 

 hind wings are blackish brown (Fig. 60). 



The moths emerge from hibernation in early spring. In 

 Washington, D. C, they are on the wing in warm sunny days 

 even in the winter. In that latitude there are three genera- 



