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Extracted from: Timberlake P.H., (1962). A Revisional Study of the Bees of the Genus Perdita F. Smith, with Special Reference to the Fauna of the Pacific Coast (Hymenoptera, Apoidea) Part V. University of California Publications in Entomology Editors, Volume 28, No. 1, pp. 1-124.
The male of jucunda is distinguished easily from yosemitensis by the much shorter and thicker scape of its antennae, and by the greater amount of yellow on its antennae and legs. The typical female differs in having the tubercles white and the abdomen more or less pale-ferruginous or dull-yellow with dark apical bands, but in some localities (Llano and Mammoth Lake in California, and the Painted Desert in Arizona) the females are entirely dark, and I have found no certain way of distinguishing them from yosemitensis except by the associated males.
Female.—Head and thorax dark blue; mesonotum less definitely blackish than in yosemitensis. Sometimes entirely dark except mandibles and legs, and then not clearly distinguishable from yosemitensis. In typical specimens, tubercles white, abdomen with a pale ferruginous or brownish
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