HESPERIOIDEA OF A^^IERICA 43 



anal angle; inner margin slightly concave, scarcely longer than 

 outer; U. D. C. short, M. D. C. and L. D. C. about equal. Vein 

 2 twice as far from 3 as from base of cell. 

 Secondaries verj" irregular with emargina- 

 tions opposite cell and before anal angle. As a 

 rule the antennal club of nessus is slightly 

 larger in proportion to the shaft than that of 

 pulverulenta but it varies in each species. In 

 spite of the difference in appearance of the 

 two species I can find nothing to warrant 

 placing them in different genera. It may be 

 that tropical species exist which will fill in 

 the gap between them. Fig. 12. 



Key to the species 



Terminal portion of wines with brown dashes 



Fig. 12. Neuration of " 



Systasea puiverulenta neSSUS 



^^^^ This area without dashes piUverulenta 



1. SYSTASEA NESSUS 



Pholisora nes»u3 Edw., Can. Ent. rs, 192, 1877. 

 Spilotht;ru^ notahilis Strecker, Lep. Ehop. 131, 1878. 

 Biol. Cent.-Am., Rhop. ii, 452, pi. 91, ff. 27, 28, 29, 1899. 

 HoUand, Butterfly Book 329, pL xlvii, f, 17, 1898. 

 Texas and Arizona, April to August. 



2. SYSTASEA PULVERULENTA 



Leucochitonea puiieruJenta Feld., Verh. z.-b. Ges. Wien xix, 478, 1869. 

 Hesperia sampa Edw., Trans. Am. Ent. Soc. v, 207, 1876. 

 Biol. Cent.-Am., Rhop. n, 413, pi. 87, ff. 24, 25, 1895. 

 Holland, Butterfly Book 329, pi. XLVi, f. 1, 1898. 



Arizona, July and August. Texas, April and October. 



Genus PHOLISORA Scudder 

 Pholisora Scud., Syst. Rev. 51, (72), 1872. Type Papilio catuU 



I us Fab. 

 Staphylus G. & S., Biol. Cent.-Am., Rhop, n, 429, 1896. Type 



HeJias ascalaphus Stand. 

 Bolla Mabille, Gen. Ins. xvii, 72, 1903. Type — puUata Mab. 

 Hesperopsis Dyar, Jn. X. Y. Ent. Soc. xiii, 118, 1905. Type 

 Tlianaos alpheus Edw. 

 The species grouped in this genus offer a troublesome problem 



