THE GRAIN BUG. v 
Ventrally: Color uniform black, divisions of ‘‘ shelf” white, rostrum light 
brown, extending three-fourths length of venter; legs black. ‘The legs are 
sparsely pubescent in all stages of the insect. 
Described from 15 specimens. 
SECOND INSTAR. 
Length 2.2 to 2.53 mm.; width of thorax 1.21 to 1.275 mm.; width of abdo- 
men 1.54 to 2.117 mm. 
During the development of the nymphs in the second instar a 
change occurs in the color, 
markings, and pubescence which a ya 
is not accompanied by any é a; 
visible molt. The description 
of the nymphs in the early 
stages of this instar (fig. 5) 
follows: 
A PTS Mees 
ei ES OEE ere ties 
Dorsally: Head black, finely punc- 
tate, sparsely pubescent throughout ; 
eyes dark brown, prominent; anten- x és 
nz 1.375 to 1.485 mm. in length, light X “4 
salmon or brown, three terminal seg- . 
ments sparsely pubescent. Thorax Fie. 5.—The grain bug: Nymph, second 
black, coarsely punctate, sparsely instar (in early stages of the instar), 
Much enlarged. 
pubescent on dorsum and at edge of 
“shelf”; four irregular yellow-white areas on anterior borders of prothorax 
and mesothorax, with two small dots of same color on posterior border of meso- 
thorax; “shelf” white. Abdomen black, with a pale yellow double band ex- 
tending transversely across the anterior border and 
becoming enlarged near the margin; posterior to 
this band the mid-dorsal section is occupied by five 
irregular bands of the same color and two brown, 
Slightly raised, elongated, elliptical areas bearing 
the scent glands; posterior margin sparsely pube- 
scent; “ shelf ”’ white. 
Ventrally: Uniform black except the white 
“shelf”; rostrum light brown, extending three- 
fourths length of venter; legs black. 
shies ili lana See ae The following changes are observed in late 
Nymph, second instar stages of this instar (fig. 6): 
(in later stages of the 
instar). Much enlarged. Dorsally: Head pubescent only on anterior border, 
anterior half impressed with two parallel sutures 
on each side of median line. These parallel sutures persist in all the re- 
maining stages of the insect. Antennze black. Thorax with a faint tinge of 
green, no pubescence, finely punctate, no yellow-white areas. Abdomen with 
decided tinge of green; a narrow transverse yellow-white band occupying two- 
thirds of the anterior border, and posterior to this band the mid-dorsal sec- 
tion occupied by a small circular yellow-white area, two curved bands of the 
same color, and two wider black irregularly ovoid areas, bearing the scent — 
glands; ‘ shelf” red-orange. 
_Ventrally: “ Shelf” red-orange on the abdomen. 
Described from 15 specimens. 
