174 Annals Entomological Society of America [Vol. IV r 



mount importance to the well-being of the species, and al- 

 though the insects had been found to be very active in breeding 

 jars it seemed worth while to secure more accurate data as to 

 their powers of locomotion. Accordingly, a set of experiments 

 was planned to determine the distance that a larva of this 

 species would travel from the time of hatching until it died, 

 provided no food or moisture was supplied. In order to carry 

 out the test it was necessary to do so under conditions which 

 never occur in nature, but the results indicate the practical 

 impossibility of carrying on tests over so long a period unless 

 absolute control is secured, so that a careful record can be made. 

 The following apparatus was used (Plate XIII): A small 

 table 3 ft., 8 in. long, by 2 ft. wide was provided with spools 

 at each end near the top, so that a roll of paper could be reeled 

 across the top of the table, the result being accomplished by 

 turning the spools. Beneath this paper was placed a piece of 

 stiff wrapping paper which extended beyond the sides of the 

 paper connected with the reels, and the edges were bent upward 

 in such a manner as to prevent the escape of the larva from the 

 sides of the table. The paper on the reels was ordinary wrap- 



Fig, i. Rolls of Records. 



