14 



INSECT LIFE. 



eral parts. Leave the maxillae attached to the head 

 till later. 



4. Remove the head of the locust and pin it with 

 the hinder side uppermost to a piece of cork or block 

 of wood. 



5. With the head in this position the flaplike 

 lower lip or labium (la'bi-uni) can be easily seen. 

 Like the maxillas, the labium consists of several 

 parts. 



6. Lift the free end of the labium with a pin and 

 observe the tonguelike organ which arises from the 



inner side of it, and pro- 

 jects between the maxillae ; 

 this is the hypopharynx (liy- 

 po-phar' ynx). 



7. Remove the labium 

 and the hypopharynx and 

 save them. 



8. After the removal of 

 the labium it will be easier 

 to remove the maxillae than 

 before. Remove them and 

 save them. 



9. Arrange the mouth- 

 parts on a card as shown 

 in Fig. 5 and gum them in 

 place. 



10. The five-jointed appendages of the maxillae are 

 the maxillary palpi. The singular of palpi is palpus. 



11. The three-jointed appendages of the lower lip 

 or labium are the labial palpi. 



Review. — The mouth-parts of a locust consist of 

 an upper lip, the labrunt ; an under lip, the labium; 



Fig. 5. — The mouth-parts of 



cust : 8, labrum ; 10, mandibles ; 

 II, maxillae; 11 d, maxillaty 

 palpi ; 12, labium ; 12 d, labial 

 palpi ; 13, hypopharynx. 



