176 Annals Entomological Society of America [Vol. IV, 



The highest rate of travel per minute was during the first 4^ 

 hours, and averaged 4.9 ft. For the first 24 hours the average 

 was 3.69 ft. per minute; during the next 8 hours the average 

 dropped slightly and for the remaining period the average was 

 gradually reduced until the larva died. 



The temperature in the room where the experiment was 

 conducted ranged considerably higher than that outside the 

 building, the following records being taken from the report 

 of the U. S. Weather Bureau at Boston. 



June 18 — Maximum, 79 degrees; Average, 70 degrees. 



" 19— " 75 " " 68 



" 20— " 86 " " 74 



" 21— " 92 " " 80 



The larva was kept continually on a dry surface, so that 

 evaporation was very rapid, and doubtless reduced the length 

 of time that the insect would have survived under normal con- 

 ditions. 



For the first 36 hours the larva traveled almost continuously, 

 stopping only occasionally for a minute or so to rest. 



During this time it traveled away from the light, viz., 

 from the window during the day time, and at night away from 

 the single electric light which was in the room. On the second 

 night, which was after 36 hours of continuous travel the larva 

 began traveling toward the light, and continued to do so during 

 the night. 



Mr. R. G. Smith, who was on duty at the time, noted that 

 from S a. M. on June 20, the larva traveled at a continuously 

 decreasing speed. Marks were made showing direction of 

 travel, and every fifteen minutes the time was noted on the 

 lines of travel. Resting periods: 4.32 p. m., 8 minutes; 4.45 

 p. M., 5 minutes; 5.15 P. M., 10 minutes; 5.46 p. m., 12 minutes; 

 6.36 P. M., 4 minutes; 6.42 p. m., 7 minutes. The larva moved 

 only several inches at a time. In the morning the larva rested 

 often, but only for a few minutes at a time. Mr. J. J. Culver 

 noted that about 11 p. m., June 20, the larva began to crawl 

 backwards, at intervals bending the head down as if trying to 

 bite itself. It would do this for two or three minutes, then either 

 rest or crawl in the normal manner. At this time the larva 

 had become either insensible to light, or too weak to contin- 

 ually travel from it, as it traveled toward the light as much, 

 if not more, than from it. In backing the larva always moved 

 from the light. 



