98 



FIKST BOOK OP ZOOLOGY. 



the water, and in the same manner secure air. So this little 

 tree-hopper, while in the young state sncking the juices of 

 grass, and completely immersed in a watery fluid, may be 

 looked upon as an aquatic larva during this stage. 



Fig. 98.— Gkass, wrrn the Fboth 

 UPON IT, (t, «, and a Toung In- 

 sect exposed at &. 



FlO. 94.— A POETION OF A GRASS-StEM, WITH THE 



Young Insects magnified : a, the Insect reach- 

 ing out the Hinder Part of the Body to secure 

 a Bubble of Air; 6, an Insect allomng a Bub- 

 ble of j;\jr to escape in the Fluid, the dotted line 

 J) indicates the bubble; c, the Mouth- parts, like 

 a Sting-, piercing the Grass. 



Let the pupils collect and examine this froth, and, by 

 carefully wiping it away, they may expose the young insect 



fastened to the grass. 



93. The insect called the seventeen-year cicada, or seven- 



