28 
PLANT-BUGS INJURIOUS TO COTTON BOLLS. 
Fig. 4. — The conchuela: Nymph, third instar. Enlarged 13 diame- 
ters. (Original.) 
markings are sometimes present on the venter. The lines of the 
segments are usually dark in color. The length in this instar varies 
from 3.5 to 4 mm., and the width from 3 to 3.5 mm. 
Fourth instar. — The fourth instar is characterized by the first 
external evidence of 
the developing wing- 
pads. The ventral 
side of the head, 
and sometimes the 
two basal segments 
of the beak, are 
more or less oliva- 
ceous. The black 
crescentic markings 
inside the margin 
of the abdominal 
segments are more 
distinct than before. 
Otherwise the color 
corresponds very 
nearly with that of the third instar. The length of the fourth- 
instar nymph varies from 4.8 to 6.5 mm., and the width from 3.7 
to 5 mm. 
Fifth instar. — In the last or fifth nymphal instar the head and 
thorax are rarely uniformly black as in the two preceding instars but 
are more or less oliva- 
ceous, with black punc- 
tures. The venter of 
the thorax has usually 
an olivaceous but 
sometimes a pale pur- 
plish or rosaceous 
ground color, with 
black punctures and 
markings. The basal 
segments of the legs 
are more or less oliva- 
ceous. The abdomen 
is colored as in the 
previous instars except 
that the ventral series 
of spots along the mesal line is either absent or only faintly indicated. 
The length of the nymphs in the fifth stage varies from 9 to 11 mm., 
and the width from 6 to 8 mm. 
Fig. 5.— The conchuela: Nymph, fourth instar. Enlarged 10 
diameters. (Original.) 
