Chaco socos is a species of mygalomorph spiders of Chile, named after its type locality: Socos, Limarí, Region IV (Coquimbo region).

[1] This species differs from C. tigre by its spermathecae having a longer duct and a less globose fundus, and by constructing a beveled door for its burrow; the general colouration is grayish, while C. tigre is more brownish coloured.

Its cephalothorax is ashgray, with a lycosid-like pattern, while the legs and palpi are gray with darker spots; its abdomen yellowish with darker dorsal spots.

[1] This species has been collected in two localities, in high mountains near the sea, with moist soil.

The outer face of the door is slightly concave, while the burrow walls are well-compacted and lined with silk.