Perkin ist (perkin ist)

[ IMG:content-2730.png:[blocks in formation] Perla nigra. imago. a , aquatic apterous larva; b , transitional stage to c, perfect insect, or men, which usually bears two setæ; the tarsi are three jointed. The larvæ and pupæ are aquatic, and very numerous under stones in streams. The adults fly about or rest upon herbage near water. See cut under Perla. per line (pėr'lin), a. [