56 FIRST BOOK OF ZOOLOGY. 



the food is lapped up by it. Let the pupils carefully watch 

 a fly as it feeds upon a bit of sugar, or as it laps the hand. 



In the butterfly and moth the pupil may uncoil the long 

 tongue with a pin. It resembles in appearance a watch-spring. 



53. On the front of the head are two horns, or feelers, 

 called antennae. 



These are variously jointed, and vary greatly in different 

 insects. 



In butterflies, they are generally long and slender, and 

 swollen at the tips, like drum-sticks. Sometimes they are 

 thread-like^ and in others the antennae are barbed on the 

 sides, and look like a feather, as in certain moths. In some 

 beetles they are strongly jointed. In the common house-fly, 

 they hang down in front of the head. 



Below are given figures of the left antenna of several 

 different insects showing how different they are in different 

 kinds of insects. The pupils might save the antennae of 

 different insects and glue them to a card, writing opposite 

 each one the name of the insect, whether fly, beetle, or locust. 



54. On the sides of the head are round, smooth places, 

 and these are the eyes. They are entirely different from the 

 eyes of most animals, for, when examined under the micro- 

 scope, they are seen to be divided into little spaces, looking 

 very much like the surface of honey-comb. Each of these 

 little spaces represents a separate eye. Some insects have 

 hundreds and even thousands of these little spaces, or eyes. 

 For this reason, such kinds of eyes are called compound eyes. 



Under the microscope three minute black dots may be 



