HENRY SKINNER 



203 



Thanaos burgessi new species. 



This is allied to brizo and looks very much like it in color and 

 maculation but has a different facies that is difficult to describe. 

 Genitalically it is quite distinct from brizo. The band of spots 

 crossing the primaries in both species is less sagittate in the new- 

 species and the secondaries are more nearly immaculate. It has 

 also a greyer look. There is a tendency for the fringes to whiten 

 and in one specimen the fringe is almost entirely white. 



Described from seven males and three females from Arizona. 

 Two of these were taken in Arizona in 1883, by H. G. Morrison 

 and the remainder by the same collector at Mt. Graham in that 

 State in 1882. The single type, a male, in the collection of the 

 Academy is from the latter locality. 



There have also been tentatively associated with these speci- 

 mens from Stockton, Utah, VI, 1, (Spalding); Silver City, New 



Thanaos burgessi new species 



Mexico, V, 18, (Gerhard); Durango, Colorado, V 21, (Oslar); 



Platte Canyon, Colorado, V, (Oslar). Named in memory of 



Mr. Edward Burgess who made the original genitalic studies of 



the genus. 



Thanaos persius Scudder, Proc. Essex Inst., iii, 170, 1863. 



Scudder and Burgess, Proc. Best. Soc. Nat. Hist., xiii, 286, 1870 (genitalia). 



Scudder, Butterflies Eastern U. S. and Canada, ii, 1468, pi. 9, fig. 1, etc. 



Holland, Butterfly Book, pi. 48, fig. 1. 



Wright, Butterflies West Coast, 252, pi. 32, fig. 461, male. 



TRANS. AM. ENT. SOC, XL. 



