120 THE BUTTERFLIES OF THE WEST COAST 



84. Colias Harfordi. Not elsewhere illustrated in accessible 



form. 

 Plate X ; Figures 84, a, b, bb, c. 



Fig. 84, Male, Mormon Pass, S. B. Mts., June 22, 1897; 

 Author. 



a, Male, underside, S. B. Mts., May 20, 1882 ; Author. 



b, Female, San Bernardino plains. May 24, 1895 ; 



Author. 

 bb, Female, San Bernardino plains, June 7, 1897; 

 Author. 



c, Female, underside, San Bernardino plains, July 23, 



1900; Author. 



Harfordi, and the next species, Barbara, are twin forms ; were 

 discovered the same year, in the same region, and by the same 

 collector, Mr. H. Edwards, who, in later years came to the con- 

 clusion that they wfere but different forms of the same species. 

 I have myself followed this butterfly continuously for many years, 

 and have arrived at the same conclusion, although there are some 

 unexplained points still remaining. Originally, Harfordi was 

 supposed to be the paler species, and Barbara the darker, deeper 

 yellow form, and on that plan I have arranged them on this plate. 



Harfordi is extremely local, being found only in the San Ber- 

 nardino and Santa Barbara Mountains ; and Barbara has the 

 same habitat. 



The larval food-plant is Astragalus crotolarae, popularly known 

 as "rattle-weed," because when ripe the seeds rattle in the pods; 

 it is also known as "loco weed," loco meaning crazy or insane, 

 because the use of it as food for horses causes them to act as if 

 poisoned, and their eyesight to become affected as if short-sighted, 

 so that they stumble at an obstacle before they have reached it. 

 Bees, also, feeding on the blossoms become stupefied, and die. 



85. Colias Barbara. Never before figured, except in Edwards' 



costly work. 

 Plate X ; Figures 85, a, b, bb, c. 



Fig. 85, Male, Arrowhead Road, S. B. Mts., Jan 29, 1900; 

 Author. 



a, Male, underside, S. B. Mts., foothills, Nov. 23, 



1897 ; Author. 



b, Female, foothills S. B. Mts., no date; Author. 



