PINK BOLLWORM OF COTTON IN MEXICO. 5 
Rosalia, State of Chihuahua, at a point about 200 miles south of El 
Paso. The other two infestations are located in the northern portion 
of the State of Coahuila. One of these is at San Carlos, at a point 
about 15 miles southwest of the town of Jimenez on the Rio Grande, 
or about 40 miles approximately west of Eagle Pass. At this place 
infestation has been found in fields in the immediate vicinity of the 
gin. None of the insects were found in outlying fields. The other 
infestation in the State of Coahuila is located at Allende. This 
is about 40 miles from the nearest point on the Rio Grande. 
During the season of 1919 inspections were made by agents of the 
Federal Horticultural Board in the cotton region between Matamoras 
and Nuevo Laredo. No traces of infestation were found. Likewise 
the cotton growing in the Imperial Valley in the State of Lower 
California has been inspected with negative results. Inspection of 
these regions will be continued, as the insect may at any time be- 
come established along the Rio Grande by shipments of seed from 
the interior of Mexico. 
The remarks above refer to infestations in growing cotton. The 
pest is frequently brought to the border towns of Mexico in cotton 
seed scattered in freight cars, and living specimens are constantly 
being found under such conditions by the inspectors of the Federal 
Horticultural Board. 
LIFE HISTORY. 
SUMMARY OF LIFE CYCLE. 
The moths of the pink bollworm emerge in the early spring and 
summer from larvae which have passed the winter in cotton seed or 
bolls. The eggs are laid soon after emergence on almost any part of 
the plant. The incubation period is from 3 to 12 days and the larvae 
begin feeding in the squares or bolls. During the spring and summer 
the larval period occupies from 8 to 16 days, but in the fall and 
winter it is extended over a period of from a few months to two years 
or more. These two kinds of larvae, while indistinguishable taxo- 
nomically, may be designated short-cycle or "summer" larvae and 
long-cycle or " resting" larvae. Pupation takes place in the soil or 
trash on the surface of the soil, in the summer stage, and in the 
ground, seed, or lint in the resting larvae. The pupal period covers 
from 6 to 20 days. The average length of the life cycle from egg to 
egg during the summer is 31 days. 
LABORATORY METHODS. 
The experiments with the life history of the pink bollworm were 
all conducted at Ciudad Lerdo, Durango, Mexico. An adobe house 
was used for a laboratory. The adults were confined in 2-quart 
fruit jars covered with cheesecloth for oviposition. Branches of 
cotton plants containing leaves and squares, stuck in tubes of water 
