THE MOTH 43 



in July or August and preserved in alcohol or formalin, but 

 it is more satisfactory to get them fresh from the vines if 

 they can be found at the time the study is in progress. 



Other examples of the same family (Sphingidae) are the 

 tobacco worm, and the vine dresser found on grape vines. 

 These will answer all purposes for the study fully as well 

 as the tomato worm. 



External Features. — (i) Can you distinguish body 

 divisions? What is the color of the specimen? Is this 

 color an advantage? Why? What common name is ap- 

 plied to this larva? 



(2) What cephalic plate is present in the middle of the 

 face? Do the antennae resemble the legs? Compare the 

 antennae with those of the imago. 



(3) What kind of mouth parts has the larva? What 

 kind has the imago? Note the bi-lobed labrum. Draw. 

 Behind the labrum find the horny mandibles. Notice the 

 maxillae, and labium behind the mandibles. Draw the 

 labium and maxillae, posterior view. 



(4) Find the true legs, and from them determine the 

 segments of the thorax. Are all the true legs alike ? What 

 is their function? Draw. (X4)- 



Draw entire specimen (Xi)- 



(5) Count the false legs, or pro-legs. What segments 

 of the body bear them? Draw your finger over the tips 

 of the false legs. What happens? Why? For what are 

 these legs adapted? Draw a pro-leg enlarged. 



(6) Compare a true and a false leg. Why are the false 

 legs so called? Are they segmented? 



(7) Count the segments of the abdomen. How many 

 spiracles? How distributed? Draw a spiracle enlarged. 



