288 MANUAL OF VEGETABLE-GARDEN INSECTS 



moth has an expanse of nearly If inches. The front wings 

 are gray or clay-colored shaded with brown and marked with 

 black. The orbicular and reniform spots are distinct, outlined 

 with dirty white and the basal two thirds of the front margin 

 of the wing has a broad light band. The hind wings are brown- 

 ish, darker towards the margin (Fig. 17(3). In the agrestis form 

 the markings are nearly all obscure. Although the moths 



emerge in late June and 

 early July, they do not 

 deposit their eggs until 

 September and October. 

 The yellowish white, globu- 

 lar, slightly flattened eggs, 

 about xo ii^<^h in diameter, 

 are deposited on the surface 

 of the soil often in newly 

 plowed fields and hatch in 

 nine or ten days. The 

 larvae become partly grown before the advent of cold weather. 

 There is only one generation a year in Montana and Alberta. 



Fig. 176. — The army cutworm moth 

 (X lA). 



References 



Mont. Agr. Exp. Sta. Bull. 17, pp. 10-18. 1898. 

 Mont. Agr. Exp. Sta. Circ. 4. 1910. 

 Col. Agr. Exp. Sta. Bull. 98, pp. 17-22. 1905. 

 Cooley, Jour. Agr. Research, 6, pp. 871-881. 1916. 

 Dept. Agr. Canada Ent. Bull. 13. 191G. 



The Army- Worm 



Heliophila (Leucania) unipuncta Haworth 



The army-worm is one of the most cosmopolitan of insects. 

 It occurs in practically every region of the world except Africa 

 but is most injurious in the northern United States and Canada. 

 In this species the habit of migrating from field to field in large 

 numbers, or so-called armies, is developed to a high degree and 



