216 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



The Hornworms or Tobacco-worms * 



Of all the insects feeding upon tobacco, the Hornworms are 

 the most widely injurious and therefore best known. The cater- 

 pillars of two species of moths are commonly included under this 

 popular name, both species occurring throughout the tobacco- 

 growing States, the northern tobacco-worm being more common 

 in the North and the southern tobacco-worm more common in the 



FIG. 181. Northern tobacco-worm, or "hornworm" (Phkgethontius quinque- 

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

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



South. The differences in the adult moths may be readily appre- 

 caited from Figs. 181 and 182, the southern form being darker and 

 with brighter orange spots on the abdomen, and the white lines on 

 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. 



* Phlegethontius quinquemaculata Ha worth (Northern), and P. sexto 

 Johanssen (Southern). Family Sphingidce. 



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