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Start here, quoting the description from Curran (Bulletin of the American Museum of Natural History 80(3):51-84 1942):

Physegenua ferruginea Schiner
SCHINER, 1868, Novara, p. 277.
Ferruginous, the front with three black spots, mesonotum with two or four obscure, narrow, darker vittae; mesopleura with a subrectangular, opaque black spot below the bristle; apical abdominal segnment with median black spot; anterior tibiae and tarsi, an incomplete preapical band on the front femora and the posterior tibiae blackish, the middle tibiae mostly brownish.
A series of both sexes from Brazil.
It is possible that more than one species will agree with the original description.
The opaque black spot on the pleura usually partly surrounds the bristle, and usually only the dorsocentral vittae are distinct. They are rarely brownish.