Capnia lacustra, also known as the Lake Tahoe benthic stonefly, is a species of insect in the family Capniidae.

[1][2] Capnia lacustra is a yellow-ish stonefly up to 5.5mm long that lacks both wings and external gills.

[3] It has long, filamentous antennae, paired abdominal cerci, and large compound eyes.

[citation needed] Unlike other stoneflies, Capnia lacustra adults do not leave the water to lay eggs.

[4] Capnia lacustra is endemic to Lake Tahoe, which spans the border of Nevada and California.