A Monograph of the Ithomiidae Lepidoptera Volume 111: by Richard M. . Fox

By Richard M. . Fox

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Extra info for A Monograph of the Ithomiidae Lepidoptera Volume 111: Article 1, Volume 111, Issue 1

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It is interesting to compare the Hewitson description with that of Godman and Salvin and to see how misleading can be 38 BULLETIN AMERICAN MUSEUM OF NATURAL HISTORY written descriptions alone. Each description emphasizes different points of pattern and coloring, while dealing with the same insect, so that the respective authors seem to be discussing totaly different species! There are no specimens in American collections. Patricia oligyrtis hewitsoniii (Srnka) Plate 2, figure 6 [Atheris dercyllidas HEWITSON (part), 1872 (1852-1876), vol.

4. . . 0. . . . O. i. translucens Cell of forewing crossed, or nearly, by a fully scaled black diagonal bar .. . . 3 Transparent yellow area on the hind wing disc of the female is cut off sharply at M1 on the under side; the black marginal band of the hind wing with tawny edging on the upper side in both sexes . . . 0. i. insignis Transparent yellow area on the hind wing disc of the female crosses the black M1 and ends in a small, semitransparent white spot in M1-R2, which often is visible faintly above; black marginal band of the hind wing above with no tawny edging, or only slightly.

Each subspecies is homogeneous, and I have seen no intergrading examples or aberrations. The crathis subspecies may be distinguished from theon by the wider black border on the hind margin of the forewing, the black cubitus, and by the distinctive valves of the male genitalia. From insignis subspecies crathis is immediately separable by the extensive red-brown color and the lack of sulphur transparent fascia on the hind wing, as well as by the valves of the male genitalia. The large hook formed on the tip of the valve by the juncture of the dorsal margin with the fold of the sacculus is characteristic of crathis and serves to emphasize the unity of the species as distinguished from the other two species of Olyras.

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