288 



APPLIED ENTOMOLOGY 



A few species have their wings only partially covered by scales. 

 These are among the smaller species and they fly during the day (Fig. 

 304). 



Of the various species of Hawk, or Humming Bird Moths as they are 

 sometimes called, only two or three are usually 

 of any great economic importance. 



The Tobacco and Tomato Worms. — There 

 ^N^N,,^ ^"^y^ are two closely related Hawk Moths whose 

 ^^Wt^^ larvae feed on tobacco and tomato leaves. 



^^j^^^r One of these is known as the Northern 



Tobacco (or Tomato) Worm (Phlegethontius 

 quinquemaculata Haw.) and the other as the 

 Southern Tobacco Worm {Phlegethontius sexta 

 Johan.). The former is present nearly every- 

 where in the United States: the latter from 

 Massachusetts southward, and westward to 

 the Pacific Coast. 

 The adult is a moth (Fig. 305) spreading from four to five inches, 

 but in the Northern Tobacco Worm the color of the fore wings is ashy- 

 gray and the abdomen has a row of yellow spots, usually five in number 



Fig. 304. — Day-flying Hawk 

 Moth (Hemaris diffinis Bdv.), 

 about natural size. (Original.) 



— rr ^ rt *^-- — . 



Fig. 305. 



-Northern Tobacco Worm Moth (Phlegethonlius qninquenaculata Haw.), natural 

 size. {From Britton, Sixth Rept. Ent. Conn. Agr. Exp. Sta. 1906.) 



on each side, while in the Southern Tobacco Worm the fore wings are 

 brownish-gray and there are usually six yellow spots on each side of the 

 abdomen. 



