19 



these localities apiDroximates tlie time required for the entire life cycle, 

 according to our records, and as the number of larvae not transforming* 

 until spring rapidly increased from the dates given for the first cap- 

 tured, so that within 20 daj^s thereafter all were of this winter brood, 

 it seems certain that there could not be a third brood in any of the 

 localities mentioned, as there is not room for them. A partial brood 

 from the earlj^ maturing second brood could be granted if necessary. 

 Now, if Ave could find the first brood of larv?e extending late enough 

 to account for the last larvae that pupate, we should have no need 

 whatever to suppose a partial third brood. This we can not quite 

 accomplish from the data at hand, but we can so nearly cover the 

 period that the few daj^s remaining, in which only scattering speci- 

 mens are taken that pupate, would, in my estimation, easily be covered 

 by the few individuals that have taken a longer time for development 

 than our breeding records will show, as it is practically impossible in 

 a few breeding experiments to include the extremes of a brood. 



In our records larvae taken from the orchard late in April and 

 transferred to a moderately cool cellar continued to give moths to 

 July 24. This would easily account for eggs to August 4. As the 

 first eggs were found at Fort Collins the same year, June 9, we have 

 the egg-lajdng period extended over 56 days. 



As the first larvae were taken under bands at Grand Junction in 

 1900, on June 10, and the last larvae pupating were taken August 12, 

 these two dates mark the extremes of the brood, provided there is no 

 partial brood. It exceeds the time our records indicate for it by 7 

 days. The time is so nearly provided for that it seems that a partial 

 brood can only be allowed when proven to exist by actually carrying 

 the insect through the three generations in breeding cages. So while 

 we can not say positively that there is not a partial third brood at 

 Grand Junction, or even Rockyf ord or Canon Cit}^, our records do not 

 prove it, and the writer is strongly inclined to the opinion that it does 

 not exist. A complete third brood can not be accounted for at all. 

 When Mr. Brothers, near Denver, last year collected 2,223 larvae 

 and only 2 x^upae under bands that had been on the trees since August 

 24 — 13 days — he proved very conclusively that only stragglers of the 

 first brood were remaining at that date. 



I have not yet received sufficient data to state what the conditions 

 may be in other States. Professor Cordley has recently written me 

 that at Corvallis, Greg., he has not been able in four years to rear 

 a codling moth later than September 15, and he gives June 20 as the 

 date of the first eggs upon apples that he has been able to find. This 

 makes the period for the broods at Corvallis even shorter than at Fort 

 Collins. He also states that his records ' ' indicate two broods, and two 

 only," at Corvallis. Prof. W. M. Munson, of Grono, Me., also writes 

 under date of August 17, that "some wormy apples placed in boxes 

 August 1 are now yielding i:>upae. " So there is at least a partial second 

 brood in Maine. 



