178 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



larger veins. The younger larvae eat only from the under- 

 side, leaving the upper epidermal layer. On three plants 

 selected at random there were 31, 37, and 35 feeding, and no 

 plant was over 2 feet in height. Some larvae are dark; these 

 remain during the day at the base of the plants and their 

 color blends with the sand. Others are reddish brown; these 

 hang from the ribs of eaten leaves. Still others are greenish, 

 and hide on the underside of the leaves. L,arvae feed mostly 

 at night. 



The pupa is 13 mm. long and 3 mm. wide at posterior end of 

 wing-pads. These latter extend to within 4 mm. of caudal 

 end. The cremaster is 0.66 mm. long, with two long hooks 

 which are equal to one-half the length of cremaster; it reminds 

 one of a two-tined fork. The pupa when first formed is red- 

 dish brown, with wing-pads bluish black; edges of abdominal 

 segments, where they flex over one another, orange. One 

 pupa is shining black. Head narrower than body, rounded 

 off on ventral side; near the apex is a fine circular depression 

 that makes a small round boss 0.5 mm. in diameter. Mid- 

 dorsal raised line on thorax, which is finely transversely rugose 

 in center and with rugose lines at side running with length of 

 body. Segments of abdomen finely punctate. 



The larvae pupated December 10-13. These were naked as 

 far as could be seen. One pupated December 15. This spun 

 a minute amount of silk and made a very thin cocoon on side 

 of box. 



December 3, 1907, arsenate of lead (5 pounds to 50 gallons 

 of water) was sprayed on a few plants of poke-weed while 

 spraying for the cabbage looper {Autographa brassiccr Riley). 

 It was applied to the upper side principally. December 5 a 

 few dead larvae were found. December 7 a large number of 

 dead larvae were found on the ground under the plants, while 

 a number were carried off by ants. 



This experiment indicates that if this species should ever 

 become of economic importance it can be easily controlled by 

 spraying with an arsenical poison. 



