out on September 1. Sunflower leaves infested by the larvae die and 

 the whole plant looks as if scorched. About two weeks after hatch- 

 ing the larvae molt for the first time. During their entire life. Mrs. 

 Rice noticed, almost every colony was guarded by one or more ants. 

 When she raised the leaf to examine closer the ants gave battle and 

 bit her finger. When she removed the ants the little leaf-hoppers, 

 both larvae and imagoes, scattered with astonishing celerity all over 

 the plant. The ants returned and rounded them up exactly as the 

 collie dog does sheep, placing one ant on guard if the colony were 

 small and more if the colony were large. She noticed when one of 

 the little leaf -hoppers strayed away an ant went after it and. with 

 infinite patience, drove it home again. She noticed further that when 



Fig. 27 



-Entttia sinuata. Adult nymph; swelling of stem due to eggs; angle at which eggs are 

 laid (original). 



the larvae were ready to molt and the skin began to split on the back 

 the ants supervised the process, seeming to peel off the empty larval 

 skin. When one considers the fact that the leaf -hoppers in perfect 

 condition can both fly and jump, the control which the ants maintain 

 over them is remarkable. The writer had an opportunity of studying 

 this interesting little insect during the month of August near Tanners- 

 ville. N. Y. , also upon sunflower, and from the specimens collected at 

 that time the accompanying illustrations have been drawn. 



The swelling of the midrib, caused by the insertion of the eggs, was 

 very pronounced, as shown at figure 27. while the exact angle at which 

 the eggs are inserted is also shown at figure 27. 



