THE GRASSHOPPER AND THE SNAIL 3 



is made up of rings or segments. In what part of the body 

 are these rings plainest? The legs are attached to the 

 middle part of the body called the thorax, of which the front 

 part (to which the fore legs are attached) is movable and is 

 covered over by a sort of saddle-shaped hood, while the 

 hinder part is solid and box-like. How many pairs of legs 

 are there ? Examine a single leg and make a drawing of it, 

 showing of how many parts it is composed and how each 

 part appears. Of what use are the claws and the little pads 

 on the under surface of the foot ? To what part of the body 

 are the wings attached? Note how the narrow thicker fore 

 wings cover and protect the plaited delicate hind wings when 

 the wings are folded. When the locust flies for long dis- 

 tances it rises high into the air, until it finds an air current; 

 then it simply lets its large outspread hind wings act as flat 

 sails to hold it up, thus allowing it to float for many miles. 

 In this way the Rocky Mountain locusts sail or fly some- 

 times a thousand miles; all the way from Wyoming to 

 Kansas. Note the many veins in the wings. What are 

 these for? Draw a front wing and a hind wing. 



On the head find two large compound eyes (see fig. 2), 

 three very small simple eyes, a pair of many-jointed feelers 

 or antennae, used both for feeling and probably also for 

 smelling, and a set of mouth-parts consisting of an upper 

 lip, a pair of hard, blackish-brown jaws or mandibles, a 

 second pair of jaw-like parts called maxillae, each made up 

 of several small pieces and a small palpus or feeler, and an 

 under lip bearing two more small palpi. With the mandi- 

 bles the locust bites off, and with the help of the other parts, 

 chews bits of leaves, green stems, etc. The palpi are be- 

 lieved to be organs for feeling and tasting the food. Draw 

 the front of the head, naming the different parts. 



Note that almost the whole outer surface of the body is 

 covered with a firm, smooth coat, the chitinized cuticle, 

 that is, the horny outer layer of the skin. The skin of the 



