BUTTERFLIES OF MONTANA. 



59 



A white or albino female, Fig. 35, is sometimes found with all the 

 markings as in the yellow form, white replacing the yellow. There are 

 the following seasonal and local variations from the typical form. 



Form aridadne, Edwards, Plate IV, emerging from winter chrysalis, 

 has the fore wings tinged with orange, a spring form. Expanse, 1.75 

 inch, 45 mm. 



Form keewaydin, Edwards, Plate IV. Larger than preceding, more 

 deeply flushed with orange, a winter form. Expanse, 1.85 inch, 48 mm. 



Form eriphyle, Edwards, yellow, not laved with orange, summer form. 

 Expanse, 2.00 inch, 50 mm. 



Albinos have been taken at 



Flathead lake on the west side 



and at Fish creek east of the 



range, with expanse of wings 



52-55 mm. 



Early Stages — Egg .06 inch 

 long, na-row, fusform. ribbed 

 lengthwise, crossed by numer- 

 ous striae; color buif -white 

 when deposited, changing to 

 crimson, then to black; mature 

 larva from 1.1-1.2 inches, 26-28 

 mm. in length, dark green, with 

 band of pure white with crim- 

 son line; chrysalis with anterior part and wing cases dark green, abdo- 

 men yellow-green; the food plant is clover. 



Distribution — The range of eurytheme is very wide. It extends from 

 the Atlantic to the Pacific, and from Canada to the far south, though it is 

 rare in the south. It has been collected in the state by Elrod at Flathead 

 Lake, Missoula, Mission mountains. Dodge Mountain at 7.400 feet, and 

 IMount Lo Lo. Douglass has taken it at i ish Creek, Laurin, Ruby moun- 

 tains. Tobacco Root range, and Madison valley; Wiley has collected it 

 at Miles City, Brandegee at Helena and Gold Creek, and Cooley at Boze- 

 man. It is found in all parts of the state, and will be one of the first 

 specimens captured by the young entomologist. The reader is referred 

 to "Remarks" under piiilodice. Coubeaux says form eriphyle is very 

 common near Big Sandy. Allen has taken eriphye, ariadne and keeway- 

 den at Dillon. Coues collected keewayden and eriphyle along the the 49th 

 parallel in 1874. 



^'&- 33- Eurymus eurytheme, albii-.o, female 



