Confused Flour Beetle
The confused flour beetle is very similar in appearance and habit to the red flour beetle and the destructive flour beetle. Both the confused flour beetle and red flour beetle are small, about 1/8 to 1/4 inch in length, and reddish-brown in color. The primary distinguishing physical difference is the shape of their antennae: the confused flour beetle's antennae increase gradually in size and have four clubs, while the red flour beetle's antennae have only three. Additionally, red flour beetles have been known to fly short distances, while confused flour beetles do not.
Indian Meal Moth
Adults are 8–10 mm in length with 16– to 20-mm wingspans. The outer half of their fore wings are bronze, copper, or dark gray in color, while the upper half are yellowish-gray, with a dark band at the intersection between the two. The larvae are off-white with brown heads. When these larvae mature, they are usually about 12 mm long.
The entire life cycle of this species may take 30 to 300 days. Female moths lay between 60 and 400 eggs on a food surface, which are ordinarily smaller than 0.5 mm and not sticky. The eggs hatch in 2 to 14 days. The larval stage lasts from 2 to 41 weeks, depending on the temperature.
Saw-Toothed Grain Beetle
The saw-toothed grain beetle and the merchant grain beetle are slender, flat, brown beetles that are about 1/10 inch long. Both saw-tooth and merchant grain beetles are similar in appearance, with six saw-like tooth projections on each side of the thorax (section between head and abdomen).
The saw-toothed grain beetle has smaller eyes than the merchant grain beetle and a much larger area just behind the eyes.