126 THE BUTTERFLIES OF THE WEST COAST 



ally. It is a tropical species that finds its northern limit in Ari- 

 zona. It has never been taken in any other place north of the 

 Mexican border, that I know of. 



99. Heliconia Charitonia. 



Pl.\te XII ; Figure 99, ]\Iale, Mazatlan, Mexico, Jan., 

 1887; Author. 

 This is a tropical species, and is very rarely seen north of 

 Mexico, though, as it flies there in the winter, it seems as if it 

 might come north along the Colorado River into Arizona and 

 Southern California in the summer. 

 The larval food-plant is passion-vine. 



100. Danais Plexippus. 



Plate XII; Figure 100, Female; Southern California, 

 1899; Author. 



This is one of the best-known butterflies in the whole country, 

 it is very large, and is tame, flying about the habitations of men 

 without fear. It has been introduced from this country into 

 England, where it is welcomed and made much of as being the 

 largest butterfly in the British Isles. The sex-mark by which it 

 can be recognized is a black spot near the middle of hind wing, 

 as seen in example number 102. The figure of Plexippus, being 

 a female, shows no such spot, but all the males have the spot on 

 upper side of hind wing. 



The larval food-plant is asclepias, the milkweeds. 



Habitat : All the United States except the northern tier of 

 States across the continent. 



loi. Danais Berenice. 



Pl.\te XII; Figure lOi, Female; Mazatlan, IMexico, Jan., 

 1887; Author. 

 Berenice is a species belonging to the tropical countries, and is 

 but scantily represented in the Southern or Gulf States, and pos- 

 sibly, in still more limited numbers, in Arizona. West of Ari- 

 zona it is replaced by the variety next following, as Berenice does 

 not fly in California or any of the West Coast States. 



102. Danais Strigosa. 



Plate XII; Figure 102, Male; Southern CaHfornia, 1903; 

 Author. 

 Strigosa is common in Southern California, but its northern 

 flight is limited by the Tehachapi Mountains, beyond which I have 



