64 



LOWER PTERYGOTA 



tion of crops, and the catching of the newly hatched hoppers 

 in early summer before the damage has been done are 

 measures that will assist in keeping them in check. They 

 are preyed upon by several parasitic and predaceous insects 



\ / 



Fig. 29. — Trimerotropis maritima, female. (After Lugger.) 



and by spiders and birds as well as fungous diseases, which 

 together serve to hold their numbers down. 



Another very similar species, but with longer wings, and 

 which occasionally has a migration, but probably not so 



