 Measuring 3–4 millimeters in length as adults, they are cryptic, superficially resembling caterpillar frass.17, sometimes 18 species are presently accepted in this genus, all of them occurring in North America (including Mexico; some were previously in the genus "Chlamisus").In the spring, female "Neochlamisus" lay eggs singly on the leaves or stems of their host plant and then form a case of fecal material around each.