280 



IKSECTS iN.irRIOrs TO STAPLE CROPS. 



their base; and on the fourth segment are four spines, as 

 there are on all tlie others, excepting the terminal, which 

 has two pairs, one posterior to the other. The spines are 

 yellow, witli blackish branches, excepting the terminal 

 pair, which are black; and there is a row of reddish ones 

 on each side. TJie under surface is yellowish gray, darker 



a 



Fig. 101. — The Semicolon-butterfly {Polygon i<i iiterrogationis). a, 

 egg chain; h, larva; r, chrysalis; d, adult — all natural size ex- 

 cept a, which is greatly enlarged. (After Howard, U. S. Dept. 

 Agr.) 



on the anterior segments, with a central line of blackish, 

 and many small black dots. (Saunders.) 



The chrysalis is ash-brown, with the head deeply 

 notated, and with eight silyery spots on the back, this 

 stage lasting from eleven to fourteen da3^s and the butter- 

 flies emerging in July. These lay eggs for another brood 

 late in July and throughout August, mainly upon the 



