54 IOWA STUDIES IN NATURAL HISTORY 



11. THANAOS HORATIUS 



Nisoniades horatius Scud. & Burg., Proc. Bost. Soe. Nat. Hist, xm, 301 f. 



13, 1870. 

 Nisoniades virgilius Scud. & Burg., op. cit. p. 302, f. 14. 

 Nisoniades petronius Lint., Papilio I, 70, 1881. 

 Scudder, Butt. New Eng. n, 1486, 1889. 

 Holland, Butterfly Book 336, pi. xlviii, f. 15, 1898. 



Florida and Texas, north to Colorado and Minnesota; May, July, Au- 

 gust, October. The females are conspicuously marked but the males resem- 

 ble juvenaUs closely. 



12. THANAOS TERENTIUS 



Nisoniades terentius Scud. & Burg., Proc. Bost. Soc. Nat. Hist, xi.ii, 292, 



f. 6, 1870. 

 Nisoniades ovidius Scud. & Burg., op. cit. 295, f. 8. 

 Nisoniades naevius Lintner, Papilio I, 69, 1881. 

 Scudder, Butt. New Eng. II, 1490, 1889. 

 Holland, Butterfly Book 336, pi. xlviii, f. 3, 1898. 



Florida, April, May and July. South Carolina, May. Mississippi, Au- 

 gust. The very dark, even color of this species is easy to recognize, and as 

 a rule the brown patch on the primaries is conspicuous. 



13. THANAOS PACUVIUS 



Nisoniades pacuvms Lint., 30th Eep. N. Y. Mus. Nat. Hist. 172, 1878. 

 Holland, Butterfly Book 336, pi. xlviii, f. 9, 1898. 



California, Arizona, New Mexico and Colorado; March, May, June and 



August. 



14. THANAOS SCUDDERI 



Thanaos scudderi Skinner, Trans. Am. Ent. Soc. XL, 215, 1914. 

 Thanaos pacuvvus G. & S. (not Lintner), Biol. Cent. -Am., Ehop. n, 458, pi. 

 91, ff. 16, 17, 1899. 

 Texas and Arizona, July and August. I am unable to separate this 

 species from pacuvius except by the structure of the male genitalia. Skin- 

 ner points out a slight difference in the hyaline spots. 



15. THANAOS CLITUS 



Thanaos clitus Edw., Papilio n, 180, 1882. 



Thanaos maestus G. & S., Biol. Cent.-Am., Ehop. n, 457, t. 91, f. 18, $ gen., 



1899. 

 Holland, Butterfly Book 336, pi. xlv, f. 8, 1898. 

 Arizona, May to August; California and Colorado. 



16. THANAOS TRISTIS 



Thanaos tristis Boisd., Ann. Soc. Ent. France (2), x, 311, 1852. 

 Oberthiir, Etudes ix, (1), pi. COXL, f. 2081, 1913, figure of type. 

 California, June and August. Arizona. 



