INSECTS INJURIOUS TO TOBACCO 



229 



the hind-wings being less distinct. The larvae of both species 

 commonly attack tomato vines and are commonly called tomato 

 worms where tobacco is not grown. 



Life History. The pupae pass the winter several inches below 

 the surface of the soil and from them the moths emerge in May and 



FIG. 162. Northern tobacco-worm, or " hornworm " (Phlegethonlius quinque- 

 maadala): a, adult moth; 6, full-grown larva; c, pupa natural size. 

 (After Howard, U. S. Dept. Agr.) 



June, according to the latitude and season. The females deposit 

 their eggs singly, upon the lower surfaces of the leaves, from which 

 the little caterpillars hatch in from four to eight days. The char- 

 acteristic work of the larvae is too well known to every tobacco 

 grower to necessitate description. The caterpillars become full 

 grown in about three weeks, during which time they moult some 

 five times. The full grown larvae are three to four indies long, of 



