LIFE HISTORY OF CARPENTER ANT. 1 79 



fully chopping to pieces the logs, stumps and trees in which 

 they were found, I was able to obtain the colonies almost entire. 

 Some colonies were counted as they were first picked up, and 

 others were killed in cyanide bottles and counted later. 

 As a result of the first method I have the following data : 

 On July io, 1906, I found a dealated queen of C. pennsyl- 

 vanicus crawling on the sidewalk in the university campus. I 

 placed her in a Fielde nest in a basement room of the insectory 

 and observed her daily throughout the summer and autumn. 

 For the first three days she remained in the light room as if not 

 content with her lot, but she then went to the dark room and 

 on July 18, I saw the first eggs. Eggs were laid, in all, as 

 follows : 



July 18 2 July 24 2 



" 19 3 " 2 5 J 



<< 20 2 " 26 2 



" 21 2 " 27 I 



" 22 2 " 28 2 



" 23 2 August I I 



These eggs hatched as follows : 



August 11 2 August 16 2 



" 12.., 3 " 17 1 



" 13 2 " l8 2 



" 14 2 " 20 1 



" 15 3 " 22 2 



Two eggs did not hatch, but either dried up or were eaten. 

 The first larvae to appear grew very rapidly, almost doubling in 

 size in a single day, and the rate of growth decreased gradually 

 as other larvae appeared to demand food and care. By Septem- 

 ber 1, the change in size was scarcely perceptible in a week's 

 time. 



These larvae pupated as follows : 



September 1 2 September 10 1 



" 3 1 " 12 1 



4 1 " 16 1 



5 1 " 2 5 1 



As twelve callows appeared, three more larvae must have 

 pupated, but the dates of their pupation are not known. The 

 twelve pupae gave the imago as follows : 



