HESPERIOIDEA OF AMERICA 21 



Genus POLYGONUS Hiibner 

 Polygonus Hbn., Samral. exot. Schmett. n, t. 144, 1822-6. Type 



Polygon us lividus Hbn. 

 Acolastus Scud., Syst. Rev. 50, 1872. Type Hesperia savigwy 



Latr. 

 Nennius Kirby, Wytsman's Hubner 105, 1902. New name for 



Polygonus and Acolastus. 

 Second joint of palpi appressed, densely scaled ; 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 Pig. 4. Polygonus amyntas 

 ^ . ' . Fab. a. Club of antenna, b. 



equidistant between 4 and b ; spur vein Neuration of primary 

 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 Mollusea. 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 amyntas. 



1. POLYGONUS AMYNTAS 

 Papilio amyntas Fab., Syst. Ent. 533, 1775. 



Polygonus lividus Hbn., Samml. exot. Schmett. n, t. 144, 1822-26. 

 Hesperia savigny, Latr., Enc. 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 amyntas arizonensis Skinner, Trans. Am. Ent. Soc. xxxvn, 209, 

 pi. x, 1911. 

 The western race of amyntas 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, September. 



