. Bulletin of the U.S. Department of Agriculture. Agriculture; Agriculture. THE GRAIN BUG.. Fig. 5.—The grain bug: Nymph, second instar (in early stages of the instar). Much enlarged. 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 INSTAB. 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 oc
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. Bulletin of the U.S. Department of Agriculture. Agriculture; Agriculture. THE GRAIN BUG.. Fig. 5.—The grain bug: Nymph, second instar (in early stages of the instar). Much enlarged. 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 INSTAB. 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 is not accompanied by any visible molt. The description of the nymphs in the early stages of this instar (fig. 5) follows: Dor sally: Head black, finely punc- tate, sparsely pubescent throughout; eyes dark brown, prominent; anten- nae 1.375 to 1.485 mm. in length, light salmon or brown, three terminal seg- ments sparsely pubescent. Thorax black, coarsely punctate, sparsely 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. Fig. 6.—The grain bug: "^^^ following changes are observed in late Nymph, second instar stages of this instar (fig. 6) : (in later stages of the instar). Much enlarged. Borsally: Head pubescent only on