Cryptolarynx armatus is a species of beetle of the family Curculionidae. It is found in South Africa, where it is only known from the type locality near Nieuwoudtville.
Adults reach a length of about 1.5âÂÂ3.5 mm and have an integument black body, with the scapes, tibiae and tarsi reddish.
Specimens were collected in August, in stands of Oxalis obtusa and O. cf. suteroides.
This species name refers to the apical cuticular expansion of the protibiae of the males, forming together with the mucro two strong teeth.