116 



NATURAL HISTORY OF INSECTS. 



subsist on the juices of plants, and a few kinds envelop 

 themselves in a mass of froth called "frog-spittle." The Cali- 

 fornia Grape-vine Hopper (Fig. 298) belongs to this Family. 



LANTERN-FLIES (Fulgoridse] . These insects are Fig. 299. 

 provided with four wings, the first pair of which 

 are usually opaque ; the feet and antennae are 

 three-jointed, and the head is sometimes furnished 

 with a high, thin ridge ; the two ocelli are placed 

 beneath the eyes. The Frosted Leaf-hopper (Fig. 

 299) belongs to this Family. 



HARVEST- FLIES ( Cicadidss ). These insects, improperly 

 termed "Locusts,' 7 are provided with four large transparent 

 wings ; the feet are three-jointed ; the antennaB small, and six 

 or seven-jointed, and on the top of the head are three ocelli. 

 These insects are of a large size ; they deposit their eggs in 

 slits made in the twigs of trees (Fig. 300, d), and the young> 



Fig. 300. 



when hatched, drop to the grcund, which they enter, and where 

 they are supposed to feed upon the roots of plants. One 

 species, the Seventeen-year Locust (Fig. 300), requires seven- 

 teen years to complete its growth. 



