100 
between the two was most gratifvino-. His laboratory records are 
presented in connection with the lengths of the life cycle on page 97. 
From observations and breeding experiments there can be no doubt 
that there are four principal generations each season in northern Texas. 
Besides these there is a fifth, which is of very small extent, and appears 
too late to damage cotton to an appreciable extent. 
At Victoria, Tex., about 3'20 miles south of Paris and in about the 
latitude of Leesburg, Fla. , the number of annual generations, from all 
available data, appears to be about six. On the basis of four broods 
at Paris, six broods at Victoria could reasonably be expected by reason 
of its more southern location and consequent longer breeding season. 
In 1903. and also in 1904, moths were out and ovipositing freely by 
the 1st of April, and in the fall of the former year, essentially normal, 
larva? had largely entered the soil for hibernation as pupa? by the 
middle of November. There would thus be a breeding period of 234 
dsLvs, time sufficient for six broods at the average time of 37 days for 
each generation and a few days over, indicating a partial seventh gen 
eration. which actually occurs by the emergence of a few moths from 
late fall pup^e. 
It is considered very probable that in the vicmity of Brownsville, 
Tex., and extreme southern Florida there may be seven full genera- 
tions each year. In the vicinit}' of Miami, Fla:, according to Prof. 
P. H. Rolfs, complete hibernation probably does not occur, as he has 
observed bollworm larv^ during the winter months feeding on toma- 
toes, naturally necessitating more or less activity on the part of the 
moths during this period. However, according to the gentleman men- 
tioned, the larva? do not appear in force until along toward May, so it 
would appear that the bulk of the insects hibernate as pup^e. 
It is therefore seen that there may be from four to six annual gen- 
erations of the bollworm for the cotton belt. It will be remembered 
that this number ao-rees exactlv with the estimated numbers of gen- 
erations by other workers. For the extreme southern parts of the 
United Stated complete hibernation may or may not occur, depending 
on local conditions and the character of the season. 
The number of annual generations of the bollworm has been indi- 
cated with more or less certaintv for several localities in the central 
and more northern States. 
For northern Delaware. Professor Sanderson states:" 
In this latitude the moths appear during May and deposit their eggs on com and 
other food plants, such as beans. * * * The second brood of moths appears in 
northern Delaware about the middle of July, and a third brood during the first two 
weeks of September. This would indiciite three generations of larv^, the third 
pupating for the winter. 
(I Ins 
:eets injurious to staple crops, 1902, p. 153! 
1 
