Cedraderus, new genus is erected for a single species described from California, USA, Cedraderus constrictus (Fall, 1910), new combination, and distinguished from all other aderid genera based on the pronotum having subapical and sub-basal sulci, presence of a supraepipleural groove on the elytron, lack of sexual dimorphism and setal brush on the metafemora, and abdominal ventrites 1 and 2 connate with a complete suture.