346 
Journal of Agricultural Research 
Vol. IX, No. io 
it emphasizes the importance of maintaining for our country this enor¬ 
mous advantage over the rest of the world in the matter of cotton 
production. 
HOW TO DISTINGUISH THE PINK BOLLWORM IN THE FIELD 
Definite and final determination of P. gossypiella in any stage can be 
made only by the aid of the microscope; and, unless a collector or 
inspector is thoroughly familiar with the species, all suspected material 
should be sent at once to the Bureau of Entomology for determination. 
Even a fraction of the insect in any of its stages can be recognized under 
the microscope by the characters given in succeeding sections of this 
paper. 
The following essential characters, all of which can be discerned by 
the aid of a common pocket lens, will enable the practical worker to 
make a reasonably certain preliminary determination of the insect in 
all its stages in the field. 
If a small dark-brown moth is caught in the cotton field or in a cotton 
mill or warehouse and is found to have the forewings pointed and the 
hindwings broad and sinuated below the tip and to possess long curved 
palpi and long stiff hairs on the first antennal joint, it is reasonably 
certain that the moth is P. gossypiella , the adult of the pink bollworm 
(PI. 7, A). 
If, within the cotton boll or associated with stored cottonseed, a 
small white or pinkish caterpillar with brown head is found and under 
a hand lens the mandibles are seen to have four teeth (Pi. io, D-G) and 
the crotches on the abdominal prolegs form a partial circle or horseshoe, 
opening outwards (Pi. io, K ), the caterpillar will most probably prove 
to be the pink bollworm. 
Again, if, within a cotton boll or otherwise associated with cotton in 
the field or in the mill, a small lepidopterous pupa is found, which under 
the lens is found to be entirely covered with a short velvety pubescence 
and to possess a short, curVed, upturned hook at the posterior end 
(Pi. 12, A-D ), it may with considerable certainty be determined as a 
pupa of the pink bollworm. 
GENERIC DESCRIPTION 
PECTINOPHORA, new genus (Gelechiidae). 
Type: Gelechia gossypiella Saunders. 
Moth. —Face and head smooth. Labial palpi long, recurved, reaching above vertex; 
second joint thickened on the underside with slightly furrowed brush, which is evenly 
attenuated toward apex; terminal joint shorter than second, somewhat thickened 
with scales in front, compressed, pointed. Maxillary palpi minute, deflected. 
Tongue long, spiraled, scaled in its entire length. Antennae serrated and finely cili¬ 
ated on the underside; basal joint with heavy but sparse (5-6) pecten. Thorax 
smooth. Fore wings (fig. 1, A) elongate ovate, pointed, smooth; 12 veins, 7 and 8 
