Colonus pallidus is a small jumping spider with a body length of approximately 3-5 mm.[2][3]
Females show some variation in coloration. One form described by Holmberg has a totally black head dorsally, featuring a five-rayed star of almost white color that divides the head into five parts. The opisthosoma displays a double longitudinal row of dark stripes directed obliquely outward and backward.[4]
Males have a reddish-brown cephalothorax with black eyes positioned in a darker shadow. They display yellowish-white scales, particularly covering the sides, with exposed areas being strongly glossy. The chelicerae are somewhat hidden under the head and dark rust-brown in color. The pedipalps are ochre-yellow with the terminal segment being somewhat darker, and the genitalia are blackish-brown.[2]
The cephalothorax is broad and high, with the thoracic region narrowed posteriorly and strongly roof-shaped. The opisthosoma is thin, long, and cone-shaped at the posterior end.[2]
The opisthosoma is beautifully olive-yellow with two longitudinal stripes extending over the sides that are bright yellowish-white. On the posterior half, there is a row of black dots, with two of these extending further inward. The ventral surface is bright yellow with a whitish coating on both sides and a bright yellowish-white longitudinal stripe.[2]
The legs are yellow, with the femora of the four anterior legs being brown at the tips. The knees and tibiae have a rust-brown coating, while the tarsal tips are finely black.[2]
