16 
With the three subsequent molts there are no marked changes except 
in size and the distinctness in definition of the various colorings and 
markings of the body of the larva. 
The mature worm varies in length from 31 to 36 millimetres, with 
diameters of about 4, 5, and 4 millimetres at anterior, middle, and pos- 
terior regions, respectively. The head of the mature Boll Worm is never 
darker than a light brown, or, in the darker colored worms, mahogany, 
but may be paler according as the specimen is a lighter colored one. 
The true legs are dusky or blackish, as also the spots on the j)rolegs. 
The latter are now each provided with fifteen small hooks. 
The color of the body of the mature worms varies from all gradations 
of the darker or rose-colored specimens to those which are light-greenish 
with a faint rose tint or entirely light-greenish. The darker colored 
ones greatly predominate from about August on through the remainder 
of the season. The markings of the worms which are most frequently 
met with at this time are as follows : 
Along the median line of the dorsal region is a brownish or black- 
ish stripe containing in its center an interrupted white line. Next, the 
subdorsal stripe, which is lighter colored, and along which is found the 
first subdorsal row of piliferous tubercles. Below this is a subdorso- 
lateral stripe, which is usually about the same color as the dorsal one. 
The subdorso-lateral stripe is slightly wider at the center of each seg- 
ment, and within its borders are found two more rows of piliferous tuber- 
cles. Next comes the lateral or stigmata stripe, which is usually pure 
white. Along this stripe are found the spiracles and one row of pilif- 
erous tubercles. Between the lateral stripe and the prolegs is a stripe, 
Avhichis usually of the same color as the ventral surface, which latter 
is a uniform whitish, This sublateral stripe contains two rows of 
smaller tubercles. In many of the darker rose tinted specimens this 
stripe is often nearly a pure rose color, in which case the stigmatal 
stripe is also more or less tinted. Throughout all the stripes except 
the lateral and sublateral ones, and in these where they are colored 
other than white, are found numerous interrupted, irregular, white lines 
and spots. The stripes are ail of a uniform width throughout, with the 
single exception mentioned. In the lighter colored specimens none but 
the dorsal and subdorso-lateral stripes can be distinguished at all, and 
often only the dorsal one. 
The first segment is provided dorsally with a denser, calloused pare 
irregularly shield-shaped and which is pale brown or black, according 
as that is the general color of the worm. In the newly hatched worm, 
however, it nearly always appears as a very distinct black patch. This 
calloused portion has a distinct median groove dividing it into two 
symmetrical halves, each of which bear similar markings as follows : 
Four small pits in the form of a trapezoid, the posterior pair being 
nearest together; from each of these pits extends a fine short hair. In 
the center and extending each side of the median line are two deep 
