May, 1918] 



Parasites of Leaf -Hoppers 



251 



time spent in the cocoon in the summer is from twenty to 

 thirty-one days, averaging twenty-five and a half days. In 

 one case an adult was noticed within the cocoon ready to issue 

 seventeen days after it was spun. This issued two days later. 

 Of ten cocoons spun during the summer, seven contained larvae 

 that pupated soon, the rest remaining as larvae over winter. 

 The life cycle is summarized in the following table : 



There are two generations a year, the adults for the first 

 issuing during June, and those for the second in early August. 

 Winter is passed in the larval stage in the cocoon. This species 

 is parthenogenetic. 



Gonatopus contortulus Patton. 



This species parasitizes Deltocephaliis sayi adults and has 

 been reared from no other host. The oval, dark grey egg is 

 always laid between the anterior abdominal segments, generally 

 being thrust entirely beneath the cuticle but occasionally being 

 attached externally in the suture between the segments. In the 

 majority of cases it is laid between the second and third abdom- 

 inal segments, either on the right or left side, but it may also 

 be laid between the first and second or third and fourth. The 

 female used in the experiments was unfertilized, having been 

 bred from a parasitized hopper taken in the field. She issued 

 August 17 and died August 30, thus living thirteen days. A 

 total of 17 eggs was laid in a period of nine days as the table 

 below indicates: 



* No hoppers were given to the female August 19 and 22. 



