October, ’23] 
HAMLIN: SEASONAL ADAPTATIONS 
421 
of the western prickly-pears, causing large swellings. When full-grown 
they leave the joints and spin their cocoons beneath fallen segments or 
other rubbish near the base of the prickly-pear plant. The large 
sluggish moths which issue from the cocoons mate quickly, deposit 
eggs as “sticks” and soon die. 
During May and June, 1921, stocks of laivae were collected in the 
vicinity of Uvalde, Texas. The progeny of these insects are still on 
hand partly in Australia and partly in Texas. Of course, moths emerg¬ 
ing from later collected material were mingled with the original lot, but 
this fact does not affect the developments to be pointed out. 
Below 
is shown the record of the generations of this material from 
May, 1921 to May, 
1923. 
Record of Generations 
Year 
Month 
At Uvalde, Texas, U. S. A. 
At Brisbane, Australia. 
May 
Emergence 
Oviposition 
June 
July 
Larval 
On Dec. 6, 1921 a portion of 
the insects left the U. S. A. 
Aug. 
Larval 
and arrived Brisbane, Aus¬ 
1921 
Pupation 
tralia on Dec. 30, 1921. 
Sept. 
Emergence 
Oviposition 
Further happenings to this 
portion are shown below. 
Oct. 
Nov. 
Larval 
Dec. 
Larval 
Pupated en route 
Jan. 
Larval 
Emergence 
Oviposition 
Feb. 
Larval 
Larval 
Mar. 
Larval 
Larval 
Apr. 
Pupation 
Pupation 
May 
Emergence 
Emergence 
June 
Oviposition 
Oviposition 
Larval 
1922 
July 
Larval 
Larval 
Aug. 
Larval 
Pupation 
Larval 
Sept. 
Emergence 
Larval 
Oct. 
Oviposition 
Larval 
Pupation 
Nov. 
Larval 
Emergence 
Oviposition 
Dec. 
Larval 
Larval 
Jan. 
Larval 
Larval 
Feb. 
Larval 
Larval 
1923 
Mar. 
Larval 
Pupation beginning 
Apr. 
Pupation 
Emergence & oviposition 
beginning. 
May 
Emergence 
Oviposition 
Pupation ending 
From the above record of the seasonal history of the species, it will 
be noted that at Uvalde there are two generations annually. The over- 
