Atlatsjapyx atlas

The adult is a large insect, long and thick, with a body length of 38.3-58.6 mm, and the widest part is 5.8-8.6 mm in the second abdominal segment. There is no metamorphosis, the larvae are very similar to the adults, and the eggs are oval or spherical.
The head and legs are yellow, the back of the thorax and abdominal segments 1-7 are gray, the ventral surface is yellow, the back of the 8th and 9th abdominal segments is reddish brown, and the 10th abdominal segment and the tail are dark brown.
The head is trapezoidal, 3.8 mm long and 3.9 mm wide, with a head-width ratio of 0.97, and sparsely covered with small hairs; the antennae are long, generally with 48-49 segments, except for a few large hairs at the base, most of them are small hairs. The upper jaw has 4 large teeth, and the inner lobe of the lower jaw has 5 petals, all of which are obviously comb-shaped. The pronotum is broadly shield-shaped, with an arc-shaped front edge and a slightly straight rear edge. The pronotum is