272 WASP STUDIES AFIELD 



in Experiment X, and one worker with a yellow mark, 

 used in Experiment XIII, on July 30. At n a. m. the 

 white-marked queen returned ; at 2 p. m. the. one with the 

 yellow mark appeared, and at 2 : 30 another worker, which 

 had never before made the test flight, returned. 



Nest 27, one worker, used for the first time, returned 

 at ii : 10 a. m. 



Nest 24, three workers new to these experiments, of 

 which one returned at 2 p. m. 



Nest 28, one male and four workers used for the first 

 time; none of these -returned. 



Experiment XVI 



September 5. This was an experiment in long distance 

 flight with whatever material the lateness of the season 

 afforded. The wasps were gathered between 4 and 5 : 30 

 p. m., September 4, taken to the laboratory on the hill-top, 

 marked, fed on honey, of which they ate greedily, kept 

 in wire cages over night and liberated the next day. The 

 material from nests 29 to 33 was taken from an old shed 

 near the railroad track one-fourth mile south of the labora- 

 tory; these had not been used experimentally before. On 

 the morning of September 5, under proper wrappings, they 

 were all taken on board the 7:25 train to a station 2.7 miles 

 to the north, removed from the train and released at 8 

 o'clock. 7 The sun was shining warm and bright, and a 



7 The material was as follows : Nest 25 : One queen marked in 

 white, used successfully in Exp. XV and X, now marked with an 

 extra yellow dot ; Nest 27 : 2 workers, I used successfully in Exp. 

 XV and i in Exp. XIV ; Nest 23 : 3 workers, I yellow used suc- 

 cessfully in Exp. XIV, and 2 never before used ; Nest 24 : 2 workers, 

 I used previously in Exp. XV ; Nest 19 : I worker used succes- 

 f ully in Exp. XIV ; Nest 2 : 3 workers now used for first time ; Nest 

 26 : i worker, not used before, and I queen with dot on thorax and 

 on abdomen, used successfully in Exp. XI on July 23; from nests 29 

 to 33, 9 workers and I male were used, all for the first time. 



