356 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 4 



the kitchen and dining room. About half of these were vi.sited inter- 

 mittently, only three of the number were vi.sited constantly. Within 

 ten weeks from the stait, the last of the ants disappeared from the 

 hotel, and, to the great satisfaction of all concerned, have not returned. 

 This is rather remarkable in that only about 1-4 pound of syrup was 

 actually consum,ed. The expense was not over $25.00. Considering 

 the fact that many patrons had left the hostelry ];ecause of the ants 

 insisting upon dining \\ith them and occasionally evading the cook 

 and combining with the n.eal, — $25.00 is a small expenditure and the 

 results extremely worth while. 



As the work progressed, when it was established that jars were 

 not being visited, they were moved to new locations. Towards the 

 end of a campaign, the ants appear to be very migratory, appearing 

 first here and then perhaps a hundred yards away. 



For the ordinary city lot 8 to 12 jars are necessary. Rarely are 

 they all visited at one time, as a rule only one or two are drawn upon 

 constantly. The results, however, seem to indicate that it is only 

 necessary for a small percentage of the foragers to invade a jar in order 

 to insure the destruction of a colony. 



The lots in the block under consideration are large. Twenty-three 

 of these lots were infested and in every case ants are very much more 

 scarce than formerly and in only about one fourth of them are any ants 

 now present. When the work started at least 20 pantries were being 

 constantly visited; since the beginning of the year we have only one 

 record, this was the last house to be provided with jars and also the 

 last to receive a spring re-charging. 



In handling the jars the present experience suggests that 



1. Better results might be obtained outside by shifting the jars 

 a 3^ard or so a]:)Out every two weeks; 



2. Jars inside a house do not need to have their locations^ changed 

 frequently ; 



3. In damp situations or in rainy weather the jars had best be on 

 their sides, first to exclude moulds and, secondly, to keep out rain 

 water. 



4. During the rainy season which probably compares with a very 

 humid climate a sponge will stay moist for at least three months; 



5. In dry weather moistening the sponge with a little water will 

 keep them serviceable indefiniteh^; 



6. An ordinary trail of ants will not exhaust a jar for a month or six . 

 weeks; 



7. In no case have ants survived where a constantly visited jar has 

 been twice emptied by the ants. 



8. AVhere food is particularly abundant it may be advantageous to 



