Bellorchestia quoyana reaches lengths of 29 millimetres, with males being slightly larger than females. The body is typically light-yellowish brown with  marbled markings of a darker brown generally assimilating the appearance sand.
The Bellorchestia quoyana can grow up to 29 millimeters long, with male specimens typically being a bit larger than their female counterparts. Its body is predominantly light yellowish-brown with marbled markings of a darker brown that resemble the coloration of sand.