LEAFHOPPERS OF THE SUGAR BEET. 37 



while some had none at all. The average would not have been more 

 than one leafhopper to 25 beets. They were most numerous on the 

 higher, drier fields, and on the early beets. Two patches of very 

 late beets close to the first one visited had no leafhoppers at this time. 



Eight females from this field were dissected, and fully developed 

 eggs were found in each one, in one, 7 in another, and from 2 to 4 

 in each one of the others. Only large eggs could be seen with the 

 lens used, and probably some of these were crushed while being re- 

 moved. The fact that all females had fully developed eggs and that 

 there were more females than males indicated that these adults had 

 been out a long time and were not new ones of a brood that had just 

 flown in from surrounding wild land. 



On June 29 a few were found in the late beets, but no nymphs were 

 found anywhere. 



eJuh' 10 the adults were present in about the same numbers as be- 

 fore, the females still containing eggs, and a few very small nymphs 

 were found. 



July 23 the adults were slightly less numerous, and the n3'mphs 

 from small to one-third grown and quite abundant. A few of thorn 

 were nearly grown, but no fresh males could be found. More 

 nymphs were found on the' early beets, more " curly leaf " on the 

 late ones. 



August 3 the nymphs were mostly about two-thirds grown, some 

 were small, and some full-grown. Large numbers of adults of the 

 new brood were out, about half of the leafhoppers being adult at this 

 time. 



August 14 the adults were abundant. The leafhoppers were nearly 

 all adults or large nymphs, but a few small nymphs were still to be 

 found. 



On August 20 the insects were mostly adult, males being still in 

 the majority, but there was still quite a number of full-grown 

 nymphs. ^lany females were dissected and a few found that had 

 from 4 to 7 large eggs, but the rest had no sign of any. These few 

 were probabl}' the last remnant of the over-wintered ])rood of females. 



September 12 the adults Avere still conmion and more males than 

 females were taken by sweeping. Large nymphs were still present 

 in small numbers. Ten females Avere dissected, but no eggs found, 

 and the abdomens were all small. Evidently there was to be no Qgg 

 laj'ing for some time, probably not that season. 



XoTE. — The season opened unusually late at I^dii in 1000. and 

 these dates would be from one to two weeks late for an ordinary 

 season. 



