April, '07] ENTOMOLOGICAL NEWS. I3I 



the smallest 27 mm. Thirty mm. is about the average size. The 

 male, figured by Bd. and Lee, measures 33 mm. and the female 

 36 mm. I have not seen any specimens with so great an ex- 

 panse, although I have a number from the Southern States. 

 The size given by Bd. and Leconte probably represents artists' 

 license. All measurements are from centre of body at base of 

 wing to tip, doubled. The color above varies from light 

 greyish brown to dark brown and fuscous. Individual speci- 

 mens have varying amounts of chestnut brown on the wings, 

 from the merest trace on the secondaries at the angle of the 

 wing to the whole upper surface of both wings entirely chest- 

 nut brown. Some have the discal areas chestnut brown, and in 

 some the outer halves of both wings are of this color. This 

 variation is also seen in niphon and augustus, and is common 

 in the females. It has no specific value, and is so variable as 

 to be of little use in constituting a variety. 



The stigma. This is a male secondary sexual character that 

 occurs in some males and not in others. This not only applies 

 to irus-henrici, but to some other species in the genus. It has no 

 gene ric or specific value, and is simply an individual variation. 



The under side of primaries. We have here a line run- 

 ning from the costa to the first median nervule. It is 

 also very variable and it has no specific value. It varies as 

 to distinctness, and in some specimens it is obsolete. In some 

 cases it is a straight line ; in some, interrupted in the middle, 

 and in some, it is as described by Cook, a series of short dashes. 

 It has no specific value and no proper correlation with other 

 so called specific characters given by Mr. Cook. 



The under side of the secondary wing is also divided by a 

 more or less distinct line running from the costa to the inner 

 margin. At the costa and at the termination of the line, it is 

 generally white, and between these points the white is very 

 variable, in some cases an entire white line from costa to 

 inner margin. In some cases it is more or less obsolete. Some 

 specimens have a small basal area of gray (see fig. of Bd. 

 and Lee), and in some the entire inner half of wing is uni- 

 colorous and the intensity of color in this varies greatly, being 

 in some cases light brown, and in others almost black. Cross- 



