secondaries much irrorated with black, giving the whole wing a dull orange-grey 
shade; within the marginal borders a complete series of small yellow spots, not 
wholly enclosed on secondaries ; discal spot of primaries an orange streak in small 
black oval ; on the under side the green is of a bluish, often greyish tint. 
Taken in Colorado by Mr. T. L. Mead, in the month of July, 1871. Mr. 
Mead wrote from Twin Lakes, on 12th July, “On 8th, we left Fairplay in 
an open hack which carries the weekly mail for this section. The driver was a 
Yankee boy who obligingly delayed altogether more than an hour for me to catch 
specimens on the “divide.” This is the water-shed between the Platte and 
Arkansas valleys. Probably the pass is very nearly 12,000 feet above the sea. 
Above 11,000 feet an elegant species of Colias makes its appearance. It is fiery 
orange and the female also is very bright. I secured 12 specimens.” From Fair- 
play, 24th July, “ Last Saturday we rode out to Mt. Lincoln and made the 
ascent. I took 34 specimens of the fiery Colias.” He also took a single specimen 
at Kenosha House, a few days later. The species frequents the highest peaks 
and ranges, and none were obtained at a lower level than 10,000 feet above the 
sea. 
This Colias bears close resemblance to Hecla, but may be readily distin- 
guished by the glandular spot before spoken of (see Plate) , a character not found in 
Hecla , and so decisive that it is not necessary to point out minor points of difference. 
