Quadrus difficilis (Weeks, 1901); Comments: Chiapas, Guianas and upper Amazon TL: Bolivia.

Zera difficilis HOLOTYPE, Bolivia, near Cochabamba.

image from: Weeks, Andrew Gray, Jr. 1905. Illustrations of diurnal Lepidoptera with descriptions.
Boston, The University Press. [1]: [1] + xii + 117 pp., frontisp., 45 pls., p. 50-51, pl. 14, f. 2