COLIAS I. 



The food plant of Eurydlce is Amorpha Californica. (Fig k.) I have several of 

 these from Mr. Wright, and they are growing in my garden. I also have received 

 eggs and larvtB through the mails. The first sent reached me 2d April, 1883. The 

 larvae began to pass first moult 4th April ; the second, 9th ; third, 12th ; fourth, 

 15th ; to pupate, 23d ; and the first imago appeared ten days later. Whole 

 period from laying of egg to imago about 33 days. 



On 4th May, 1884, I received larvte of all ages, about seventy. The black 

 spots over the band varied greatly. All the mature larvae had one each on 3 

 and 4. Of 37 examples, 23 had no other .spots. One had spots from 3 to 9 ; 

 another 3 to 10 ; but in both cases none on 5 ; four had spots from 3 to 10, five 

 from 3 to 11, two from 3 to 12. These larvae were attacked by a fatal disease, 

 and I lost nearly all. A black speck would appear on middle segments and soon 

 extend over the body. So pupte. that were at first apparently healthy died in 

 same manner. Mr. Edwards, in the paper referred to, speaks of losing many 

 chrysalids from a similar disease. I tried in vain, in 1883, to make the larvae eat 

 white clover (which several species of Colias will eat, though they may refuse red 

 clover), but, in 1884, I succeeded, and on this plant the larvae went to pupation. 

 The habits, at all stages, are similar to those of Eurytheme and Philodice. When 

 first hatched, they eat furrows in the surface of the leaf ; after first moult, they 

 eat the leaf ; and they lie extended on the upper side along the mid-rib. 



When the plate in Volume I. was published, 1870, little was known of the dis- 

 tribution of Etirydice. I quoted from Mr. Edwards, that the insect was rare and 

 local ; that its chief home was in Marion County, about thirty miles from San 

 Francisco. It is now known to inhabit several counties of California from north 

 to south. Mr. Henry Edwards writes : " I do not know how far south the spe- 

 cies may fly, but certainly not as far as San Diego, the many collections I have 

 seen from the neighborhood of that city containing not a single specimen. It is 

 however quite probable that it may reach nearly as far. To the north, it is 

 taken in Mendocino County, but not in Oregon, Nevada, or British Columbia. 

 The food plant, Amorpha Californica, grows throughout Oregon, and, I think, 

 even as far as Vancouver's Island, and it is somewhat odd that the range of the 

 species should stop short, as it apparently does, about half way between San Fran- 

 cisco and the Oregon line. It is most common in the counties of Napa, Sonoma, 

 and Mendocino, and never more than fifty or sixty miles from the coast. It fre- 

 quents the lower ranges rather than the mountains, and I have never seen it in 

 any part of the Sierra Nevada. I should say that its home is limited to about 

 400 miles at the utmost from north to south, and about sixty miles inland from 

 the seaboard. It must tlierefore be regarded as an extremely local species." 

 The mature larva and chrysalis described by Mr. H. Edwards, in Proc. Cal. 



