13 
in the greenhouse was 6 days and in the cool room 63 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 temperature of the egg is 
kept above 68° an increase of temperature 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 larve of this brood 
at Fort Collins has 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 City June 15; the earliest at Denver 
July 3. Professor Card’s record for earliest larvee of summer brood at 
Lineoln, Nebr., was June 20, and Professor Slingerland’s for Ithaea, 
N. Y., was July 1. Dr. Smith wrote me July 20 of this year that the 
eodling moth larve were just beginning to descend for pupation at 
New Brunswick, N. J., and Dr. Hopkins, of Morgantown, W. Va., 
recently wrote that the larvee were just beginning to descend there on 
June 20. Professor Cockerell, in 1897, at Mesilla Park, N. Mex., 
found larvee of this brood deseending May 51. This is the earliest 
record known to me. If there are four broods of this insect anywhere 
in the United States, Iam sure it should be at Mesilla Park. 
The earliest that we have taken larve of the second brood at Fort 
Collins is August 3. In each of these localities the number of larve 
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 Rockyford by August 20, at Canon City by August 
21, and at Fort Collins by August 30 (see Table IV). 
TaBLE IV.—Table showing proportions of larve, taken at different dates, that live 
over winter before pupating. 
Ais Rea ar te . Number 
Locality. sae agers were teeta ca hiber- Record by-— 
sa a * | nating. 
Grand Junetion,.Colo..........-- ---.| July 16-23, 1900. ..-...- 33 1 
July 24-30, 1900_._...- 534] 3 
July 3l-Aug. 6, 1900 _- 60 8 
SNC Pe ST Le | eel - Silmon Smith. 
Aug. 13-20, 1900____..- + 79 78 
Aug. 21-29, 1960 _.--..- 130 130 
Aug. 30-Sept. 4, 1900_- 192 | 192 
mockytord, Colo: 2. 22-.8.-2- <= 25. =<. 2|' Age: I-6; 19000 =.=... 22 5 
| etme Stel al 
Aug. 12-14, 1900_-_...- 5 14 
‘Aug. 15-21, 1900. ._...- 66 56 ( H.-H. Griffin. 
Aug. 22-28, 1900----..- 115 | 115 
Aug. 29-Sept. 6, 1900_- 80 | 80 
Canon City, Coloy...--.. sae. 22.25 2 daly SOS BO0 eee e ne 2 25 | 0 | 
ug. 1-13, 1899__.... _- 70 | 30 2 
Aug. 14-20, 1899... 50 | Z4p4f oh Care: 
Aug. 21-28, 1899. ._..__| 100 99 i 
Mr. David Brothers, of Edgewater, near Denver, published the rec- 
ord of his captures of codling moth larve in his orchard during the 
