14^ THE STUDY OF INSECTS. 



an ointment made of one part sulphur and four parts lard, 

 Scotch snuff, powdered wood ashes, and kerosene emulsion. 

 The remedy should be applied thoroughly, and repeated 

 several times at intervals of three or four days, in order to 

 destroy the young which may hatch after the first application. 

 The stable and the places where the cattle are in the habit 

 of rubbing should also be whitewashed or sprayed with 

 kerosene, or strong kerosene emulsion. 



Suborder HOMOPTERA (Ho-mop'te-ra). 

 Cicadas, Leaf-hoppers, Aphids, Scale-bugs and others. 



The Homoptera includes insects of widely diversified 

 form, but which agree, however, in having the wings when 

 present of the same thickness throughout, and usually slop- 

 ing roof-like at the sides of the body when at rest, and in 

 having the beak arise from the hinder part of the lower side 

 of the head (Fig. 140, b). The name is from two Greek 

 words : homos, same ; and pteron, a wing. 



This suborder includes nine families, which are designated 

 as follows : 



The Cicadas, Family CICADID.E (p. 149). 



The Lantern-fly Family, Family FULGORID^E (p. 151). 



The Spittle Insects, Family CERCOPID^E (p. 152). 



The Leaf-hoppers, Family Jassid^: (p. 153). 



The Tree-hoppers, Family Membracid^e (p. 154). 



The Jumping Plant-lice, Family PsYLLID^E (p. 155). 



The Plant-lice, Family APHIDID.E (p. 156). 



The Aleyrodes, Family ALEYRODID^E (p. 163). 



The Scale-bugs, Family COCCID^E (p. 164). 



Classification of the Homoptera. 



{For advanced students.) 



TABLE FOR DETERMINING THE FAMILIES OF THE HOMOPTERA. 



A. Beak evidently arising from the head ; tarsi three-jointed ; anten- 

 nae minute, bristle-like. 



