jao.is, i9>5 Three-Cornered Alfalja Hopper 351 



as the plant stem itself. It seems probable that the eggs in pockets 

 where these galls have developed may be so interfered with that they can 

 not incubate, but no definite observations were made on this point. 



NYMPHAL PERIOD 



The nymphal period comprises five stages, with a total length of from 

 22 to 69 days, depending upon the prevailing temperature. As is shown 

 in Table IV, during the cooler spring month of March the total length 

 varied from 42 to 69 days, while in the hot month of July the variation 

 was from 22 to 37 days. The length of the different stages was found 

 to be very unequal, the last two being found to average the longest, 

 while the fifth might be prolonged almost indefinitely, provided food or 

 other conditions were not right. This in itself is an important point, 

 for the species would be able to survive for some time on only a minimum 

 of food. There was found to be very little relation between the length of 

 the periods and the sex of the individual. 



