. Studies in natural history. Natural history; Natural history. HESPERIOIDEA OF AMERICA 21 Genus POLYGONUS Hiibner Polygonus Hbn., Samml. exot. Schmett. n, t. 144, 1822-6. Type Polygonus lividus Hbn. Acolastus Scud., Syst. Rev. 50, 1872. Type Hesperia savigny Latr. Nennius Kirby, "Wytsman's Hiibner 105, 1902. New name for Polygonus and Acolastus. Second joint of palpi appressed, densely sealed; third porrect, small. Reflexed apiculus abruptly constricted, about one-half as long as rest of club. Head slightly wider than thorax. Primaries narrow, costa evenly curved, inner margin nearly str
. Studies in natural history. Natural history; Natural history. HESPERIOIDEA OF AMERICA 21 Genus POLYGONUS Hiibner Polygonus Hbn., Samml. exot. Schmett. n, t. 144, 1822-6. Type Polygonus lividus Hbn. Acolastus Scud., Syst. Rev. 50, 1872. Type Hesperia savigny Latr. Nennius Kirby, "Wytsman's Hiibner 105, 1902. New name for Polygonus and Acolastus. Second joint of palpi appressed, densely sealed; third porrect, small. Reflexed apiculus abruptly constricted, about one-half as long as rest of club. Head slightly wider than thorax. Primaries narrow, costa evenly curved, inner margin nearly straight and outer sharply curved oppo- site cell; no fold in male. Cell three- quarters as long as Wing; Vein 5 about Fig. 4. T^gonus arnyntas equidistant between 4 and 6; spur vein F%eura°tfon of $££• b* scarcely traceable, nearer to 3. Second- aries broadly rounded, lobed at anal angle. Fig. 4. According to Scudder (Hist. Sk. 253) Polygonus was pre- occupied by Polygona in the Mollusca. Acolastus was preoccu- pied in the Coleoptera, a fact which was overlooked for many years, and Kirby offered Nennius to replace it. According to the current international rules of zoological nomenclature a dif- ference of one letter is sufficient to validate a generic name, so Polygonus cannot be regarded as preoccupied, and therefore must be retained for arnyntas. 1. POLYGONUS AMYNTAS Papilio arnyntas Fab., Syst. Ent. 533, 1775. Polygonus lividus Hbn., Samml. exot. Schmett. n, t. 144, 1822-26. Hesperia savigny, Latr., Ene. Meth. ix, 741, 1823. Skinner, Trans. Am. Ent. Soc. xxxvn, 200, pi. x, 1911. The typical form is very dark. It occurs in Florida in Aug. and Sept. la. race ARIZONENSIS Erycides arnyntas arizonensis Skinner, Trans. Am. Ent. Soc. xxxvn, 209, pi. x, 1911. The western race of arnyntas is paler than the typical form, both above and below, and the pale transverse bands of the sec- ondaries are faintly visible on the upper surface. Texas and Arizona, Please note that
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