Olinga caddis larvae construct smooth mobile cases that lack sand grains (except sometimes in small/young individuals). The aperture of the case is straight (unlike Beraeoptera). The rounded, orange or red head lacks conspicuous hairs (unlike Pycnocentrodes). There is a black mark on the side of the body behind the hind leg (unlike Pycnocentria).
Olinga larvae are most common in bush covered, cold water, stony streams.
They are collector-gatherers (feeding on fine particulate organic matter) and shredders (feeding on leaf litter).
An abundance of Olinga larvae indicates good habitat and water quality, particularly if mayfly and stonefly nymphs are also abundant. They have tolerance values of 9 (hard bottom sites) and 7.9 (soft bottom sites).