AN INTRODUCTION TO ENTOMOLOGY. 



of a buffalo (Fig. 141). This insect lives on the sap of apple, pear, 



and other trees. It is of a yellowish-green color. The eggs are laid in 



little slits in the bark ; they hatch in the spring ; and the 



young are very different from the adult, being furnished 



fwith a pair of large spines upon each segment. 

 The Two-horned Tree-hoppers, Ceresa diceros, is also 

 a common species. It resembles the Buffalo Tree-hopper 

 FIG i 4 i -ce- m s ^ ze anc * form. It is a pale, dirty yellow, spotted with 

 resa buba- brown the lateral and caudal aspect of each horn is 

 brown ; the caudal tip of the prothorax, and a large spot 

 midway between the tip and horns are also brown. The insect is 

 densely clothed with hairs. 



The genus Enchendpa illustrates another strange form found in 

 this family. The Two-marked Tree-hopper, Enchenopa binotdta, (Fig. 

 142,) abounds on various trees, shrubs, and herbaceous 

 plants. It is gregarious; and both adult and immature 

 forms are found clustered together. It is almost always 

 attended by ants. It lays its eggs in frothy masses, which FIG _ En 

 are very v/hite, and appear like wax. These egg-masses jjjjjf" bi *~ 

 have been mistaken for insects of the genus Orthezia. 

 Another very common species is E. curvdta. It is brownish, un- 

 spotted, and has a rather longer horn than the preceding species. 



" To the genus Telamona (Fig. 143) belong our 

 indigenous humpback forms, of gray, claret, or 

 greenish colors, which live in June and July upon 

 oaks, hickories, and other forest trees. They gen- 

 I4T ' " erally rest singly on the limbs and branches of the 

 trees, with the head directed away from the trunk ; 

 but in the younger stages they keep together in small groups." 

 (Uhler.) 



Family VII. 



(Cicadas.) 



The large size and the well-known songs of the more common 

 species of this family render them familiar objects. It is only 

 necessary to refer to the Periodical Cicada (or the 1 7-year locust, as 



* Cicadidae, Cicada: Cicada, Latin name of these insects. 



