112 



ORDER HEMIPTERA 



nymphs on hatching begin feeding at once upon the grass. 

 The adult females have short wings and do not jump or fly 

 rapidly. 



Inimical Leafhopper (Deltoccphalu.s utimicu.'i). — The in- 

 imical leafhopper is perhaps the most abundant species 

 throughout the northern United States where blue grass 

 is a common pasture grass. While abundant and almost 



Fig. 68. — The inimical leafhopper (Dcltoccphalus inimicus) : iiymphal 

 stages: o, newly hatched; b, c, d, later stages, the details of tarsal appen- 

 dages shown below. All enlarged. (After Osborn, Bur. Ent., Bull. 108.) 



universal in blue grass, it may also be found upon other 

 species of grass and also in wheat and alfalfa. This sj)ecies 

 is so abundant and wide-spread that it is almost impossible 

 to sweep a patch of blue grass in any locality from INIaine 

 to Washington, and south to northern Tennessee, without 

 finding it in abundance. The nymphs pass through five 

 distinct stages with differences in the shape of the head and 

 development of wing pads and an increase in the number 



