This bug is called the black bark beetle. It is not harmful to human body, although it does not eat the grain, but it will hide in the grain and make the food inedible.

Mainly parasitized in rice, wheat, corn, sorghum and other crops, except for Tibet is not known, occur everywhere, is a worldwide pest. Annual 1 generation, to larvae clustered indoors or warehouses in the crevices or debris overwintering. Pupation begins in mid to late April of the following year and continues into early July. The overwintering adults appear in late April to early-mid August and lay eggs in mid to late May to early-mid August.

Morphological Characteristics

Female adults are 4-6mm long, males are 2.8-5mm long, reddish-brown to blackish-brown, densely brown to black hairs, and yellowish-brown hairs at the base of the dorsal plate of the prothorax. Head flattened round, densely covered with black dots, behind the center with a russet single eye, antennae light brown or yellowish brown, dark brown terminal segments, **** 11 segments, the end of the 3 sections expanded.

Females with terminal segments slightly longer than the sum of 9 and 10 segments, males with terminal segments 3-4 times longer than the sum of 9 and 10 segments. Posterior margin of prothoracic dorsal plate wider than anterior margin. Rows of punctures on sheath wings indistinct. Eggs oval, 0.6-0.9 mm long, milky white slightly glossy.