It is a single, mostly complete adult of undetermined sex, preserved as a compression fossil in fine grained shale.

[1] The shale specimen is from deposits along the Canadian Pacific rail line in the Similkameen Country of British Columbia, Canada.

Rice noted the assignment of the species to Eriocampa as tentative and based on the similarities of the fore wing to other members of the genus.

The single known specimen possesses a head, part of the thorax and posterior areas of the abdomen which are dark brown to black.

E. tulameenensis is distinguished from members of the related genus Pseudosiobla in general and P. campbelli found in the related "Horsefly shale" deposits near Horsefly, British Columbia by several features, E. tulameenensis is notably smaller than members of Pseudosiobla and the fore wing vein patterning is distinct.