Crassicerus furtivus sp. nov.

(Figs. 48–49)

Description. ɗ, Body about 2.5 times as long as wide. Head subequal to pronotum in length, antenna long, second segment about 1.8 times as long as third, third segment about 1.5 times as long as fourth, fourth segment about 1.5 times as long as first; diameter of eye in dorsal view about 3 times as wide as interocular space. Posterior margin of pronotum over 3 times as long as anterior; anterior margin concave, lateral sides nearly straight, posterior angles feebly rounded, hind margin slightly concave; scutellum as long as pronotum at midline, lateral margins nearly straight, apex acute; mid legs simple, tarsi elongate, nearly 0.5 times as long as tibia, third tarsomere slightly longer than first and second combined, hind legs distinctly longer than mid legs. Abdomen oval, length distinctly longer than width, eighth abdominal sterna distinctly narrowed.

Dimensions (in mm). Body length 5.7, maximum width of abdomen 2.3; head length 0.7, width 0.7; length antennal segment I–IV: 0.2, 1.1, 0.6, 0.4; length pronotum 0.7, width 1.9; length scutellum 0.8, width 1.3; length middle leg: femur 1.3, tibia 1.3, tarsomeres I–III: 0.1, 0.18, 0.3.

Type material. Holotype, ɗ, CNU-HE-LB2006032 (dorsoventrally compressed).

Locality and horizon. Yixian Formation, Late Jurassic Chaomidian Village, Beipiao City, Liaoning Province, China.

Etymology. The name is derived from the Latin furtivus (secret, hidden).