BUTTERFLIES OF THE DISTRICT OF COLUMBIA 157 



been found. These would be almost indistinguishable from the abun- 

 dant and very variable white females of C. philodice. White females 

 occur in early spring as well as throughout the summer. 



A white female taken at Cabin John on October 7, 1928 (pi. 26, 

 fig. 8), has on the fore wings beneath the cell a faint flush of salmon- 

 pink fading to white near the black border, while the hind wings are 

 tinged with greenish yellow. As the salmon flush on the fore wings 

 covers the area that is orange in the form heewmjdin^ it is evident that 

 this white female must be referred to that form. A similar white 

 female was taken at Cabin John on September 7, 1929, and a third 

 at the same place in October of the same year. Others were taken 

 (m September 17 and 19, 1930. This type of female has not hereto- 

 fore been reported. 



A chrome-yellow male of the form eurytheme was taken at Cabin 

 John on September 23, 1928. 



In a white female taken at Cabin John on September 19, 1925, the 

 basal third of the costal border of the fore wings, the hairs on the 

 anterior portion of the dorsal surface of the thorax and on the head, 

 the hairs on the central portion of the thorax below, and the legs, are 

 bright pink. The basal portion of the fore wings as far as a line at 

 right angles to the inner border and passing through the origin of 

 vein Ml is heavily infuscated. The ground color of the hind wings 

 and of the lower part of the base of the fore wings is light grayish 

 green. 



In a male of the form ariadne taken at Cabin John on September 

 22, 1928, the size, wing shape, and markings are as in small males of 

 C. philodice. The fore wings have a faint orange flush in the lower 

 half, and the hind wings are scarcely tinged with orange. The sub- 

 central spot on the upper surface of the hind wings is a rather pale 

 orange. 



In a female of the form m'iadne taken at Cabin John on Septem- 

 ber 14, 1928, the yellow spots in the black border of the fore wings 

 are greatly reduced. The black cell spot on the fore wings and the 

 dark border of the hind wings are as in the form eurytheme. The 

 lower half of the fore wings shows a veiy faint flush of orange. 

 The color of the hind wings is scarcely intensified. 



Measurements. — Specimens taken up to the last week in July 

 measure in the length of the fore wing : Males, 24^27 mm., averaging 

 25.5 mm. ; and females, 25-29 mm., averaging 27.5 mm. 



Specimens taken from the last week in July to the end of the 

 season measure: 31 males, 25-31 mm., averaging 27.3 mm.; and 55 

 females, 25-34 mm., averaging 29.1 mm. 



Of the form ariadne the males measure 23-26 mm., averaging 25 

 mm., and the females 27-28 mm., averaging 27.5 mm. 



