13 



in the greenhouse was G days and in the cool room 6| days. The eggs 

 were all laid in a breeding cage upon one apple on the night of 

 August 11. 



It would seem from this test that if the temx^erature of the egg is 

 kept above 68° an increase of temi^erature will not greatly hasten 

 development. 



SUMMER BROOD OF LARV^. 



Our observations upon the very early larval habits have not differed 

 materially from those made by Card and Slingerland, except that we 

 have not found any indications of their feeding upon the surface of 

 the leaves. The earliest that we have ever taken larvae of this brood 

 at Fort Collins lias been June 28. This year the first capture under 

 bands was July 1. The earliest record at Grand Junction is June 5, 

 and at Rockyford and Canon Cit}^ June 15; the earliest at Denver 

 July 3. Professor Card's record for earliest larvae of summer brood at 

 Lincoln, Nebr., was June 20, and Professor Slingerland's for Ithaca, 

 N. Y., was July 1. Dr. Smith wrote me July 20 of this 3^ear that the 

 codling moth larv^^ were just beginning to descend for pupation at 

 New BrunsMick, N. J., and Dr. Hopkins, of Morgantown, W. Va., 

 recently wrote that the larvae were just beginning to descend there on 

 June 20. Professor Cockerell, in 1897, at Mesilla Park, N. Mex., 

 found larvae of this brood descending May 31. This is the earliest 

 record known to me. If there are four broods of this insect anywhere 

 in the United States, I am sure it should be at Mesilla Park. 



The earliest that we have taken larvae of the second brood at Fort 

 Collins is August 3. In each of these localities the number of larvae 

 which will live over winter as such increases rapidly in a few days 

 after the above dates. At Grand Junction pupation practically ceases 

 by August 10, at Rockj^ford by August 20, at Canon City by August 

 21, and at Fort Collins by August 30 (see Table IV). 



Table IV. — Table shoioing proportions of larvcB, taken at different dates, that live 

 over ivinter before pupating. 



Lo-l"y. ^^'^VafeT"""" 



Number 

 taken. 



Number 

 hiber- Record Ijv— 

 nating. - 





July 16-23,1900- 



July 24-30, 1900 



July31-Aug.6,1900._ 

 Aug. 6-13, 1900 



33 

 53 

 60 



1 

 3 



8 







• Silmon Smith. 



Rockyford. Colo 



Canon City. Colo 



Aug. 13-20, 1900 



Aug. 21-29, 1900 



Aug.30-Sept. 4,19ai.. 



Aug. 1-6, 1900 



Aug. 7-11, 1900 



Aug. 12-14, 1900 



Aug. 15-21, 1900 



Aug. 22-28, 1900 



Aug.29-Sept.6,1900.- 

 July 30, 1899 



79 



130 



192 



22 



14 



51 



66 



115 



80 



25 



70 



50 



100 



78 1 

 130 ! 

 192 1 

 5 i 

 4 i 

 14 i 

 56 

 115 

 80 

 

 30 

 44 

 99 



■ H.H. Griffin. 





Aug. 1-13, 1899 



Aug. 14-20, 1899 



Aug. 21-28, 1899 



- Dr.R. J.Peare. 



Mr. David Brothers, of Edgewater, near Denver, published the rec- 

 ord of his captures of codling moth larvae in his orchard duriii2: the 



