156 FRANK R. LILLIE AND E. E. JUST. 



1. June, 1911; curve 2. The first collection was made on 

 June 12, one day after the full moon or ten days after the first 

 quarter. Judging by experience this was probably the second 

 or third day of the run. That night 12 females were caught. 

 The curve of this run is bimodal, sinking to zero on the 2Oth 

 day from the first quarter, and then rising again. The last 

 swarm of the run was on the 28th day after the first quarter. 

 There is a depression in the first mode due to some unknown 

 cause. This run was separated from the following July run by 

 eleven days in which neither sex could be found. 



2. The July, 1911, run (curve 3) began on the ninth day after 

 the first quarter of the moon, thus on the night of the full moon 

 (July n). The curve of this run is also bimodal with a deep 

 depression from the ijth to the 2ist days; the last swarm was 

 on the 26th day. Here also there is a depression in the first 

 mode. There was an interval of eleven days from the last 

 swarm of the July run to the first August swarm. 



3. August, 1911. The run (curve 4) began on the eighth day 

 after the first quarter and lasted to the 26th day. While the 

 curve is decidedly irregular it is nevertheless distinctly bimodal, 

 with a depression to zero on the iyth day. Seventeen days 

 elapsed before the beginning of the September run. 



4. September, 1911. The run (curve 5) began on the thir- 

 teenth day after the first quarter. The swarms were extremely 

 small and few in number. But parts of the two modes of the 

 usual curve may be recognized. 



5. June, 1912; curve 6. The first worms were secured on the 

 1 3th day after the first quarter of the moon. I regard the 

 collections from the I3th to the iyth days as constituting the first 

 mode of the curve. The second mode is very unusual, first in its 

 irregularity, and second in its duration; it continued in fact 

 ten days after the new moon, and it exceeds all other records 

 in this respect by six days. There was thus an interval of only 

 four days between the end of June and the beginning of the 

 July run in 1912. The last seven days of the June run thus 

 occurred during the "light of the moon," a circumstance which 

 must be regarded as significant. Swarming can thus take place 

 during moonlight. Its usual absence must therefore be inter- 



