64 
BULLETIN 918, U. S. DEPARTMENT OF AGRICULTURE. 
genital plate heart shaped; bursa copiilatrix with two opposite, strongly ehitinized, 
hornlike, serrated invaginations (fig. 9, C). 
Alar expanse 15 to 20 mm. 
Full-grown larva. — The full-grown larva (fig. 10, A) is 11 to 13 mm. long, 
cylindrical, white, with dorsal side strongly suffused with pink. He^.d reddish brown 
with blackish brown mandibles and the other trophi yellowish. Thoracic shield 
rather small, divided in the middle, dark brown. [On each side of the thoracic shield 
is a small, slightly depressed, kidney-shaped spot, thinly ehitinized and less pig- 
mented than the rest of the shield. This purely specific character is easy to observe 
and may be of some assistance as contributory evidence in a preliminary determina- 
tion of the pink bollworm in the field (fig.' 11).] Anal plate small, dark brown. 
e 
-A 
y\ 
THE 
AT5E 
All 
AX 
B 
>x. 
Fig. 10.— Pink bollworm: .4. larva. B. schematic chart of arrangement of body setse of larva, TI, 
first thoracic segment; T II, III, second and third thoracic segments; A 777, 'third abdominal seg- 
ment; A VIII, eighth abdominal segment; A IX, ninth abdominal segment; A X, tenth abdominal 
segment, (Busck.) 
Tubercles small, but distinct, yellowish brown, surrounded by deeper pink than the 
prevalent suffusion and bearing rather short, dark-brown setae. Crotches of abdom- 
inal feet 15 to 17. 
Pupa.— The pupa (fig. 6, A-B) is 8 to 10 
mm. long, rather plump, reddish brown; 
posterior end pointed and terminating in a /' 
short, stout, upwardly turned hooklike ere- \ 
master; entire surface finely pubescent; no 
long setae, spines or hooks, except on last 
joint; fronto-clypeal suture distinct and 
curved sharply upward: clypeus. labrum. 
pupal eyes and mandibles distinctly indi- 
cated: antennae diverging at their extreme 
tip and not reaching to the tips of the 
wings; metathoracic legs reaching slightly 
beyond the wings to fifth abdominal segment. 
Spiracles small, normal. Anal opening 
large, slitlike, surrounded by strong hooked 
setae, 5 or 6 on each side; cremaster sur- 
rounded with 6 to 8 similar, strong, hooked ) 
setae. Genital opening slitlike, single in 
both sexes. When mature, the pupa be- 
comes much darker (fig. 6, C); the imago's larva. (Origina 
eyes can be seen prominently under the 
gena of the pupal skin, and the segmentation of the adult antennae and legs becomes 
discernible. 
o 
Fig. 11.— Thoracic shield of pink bollworm 
r 
