GENUS EUCHLOE 103 



inwards ; on the underside the marbling is dark emerald-green, 

 and is broken into large blocks leaving rather large, clear, pearl- 

 white spaces with clean-cut edges. Creusa flies from the Mexican 

 line to Canada, but not on the immediate Coast at any place, but 

 east of the Cascades, in the dryer and warmer air of that semi- 

 desert region in Eastern Washington and Oregon, and in the 

 warm and dry interior valleys of south. At EUensburg I have 

 found them, small in size but abundant in numbers, in May. 

 Throughout its whole range it comes not to the sea-shore, but 

 keeps a range of mountains between it and the sea, as it likes not 

 the damp sea air. 



55. Euchloe Hyantis. 



Plate VII ; Figures 55, b, c. 



Fig. 55, Male, Berkeley. Cal., March 14, 1894: Author. 



b. Female, Bakersfield, March 10, 1891 ; Author. 



c. Female, "West Washington," no date, W. H. 



Edwards. 



Compared with Creusa, Hyantis is larger, the dark markings 

 at apices are heavier ; generally the round white spot is diflfused ; 

 the bar at cell is less broad, reaches the costa by a small point, is 

 not bent inwards, and is not cut by a white line. And below, the 

 marbling is finer in grain, smoother, with fewer white spaces, and 

 with the edges not so clear-cut ; the marbling is more yellow- 

 green, looking as if the yellow were washed on after the green 

 was in place. 



Hyantis is the cool-weather species, and Creusa is the warm- 

 weather brother ; Hyantis favors the damp, coast air, and Creusa 

 likes a dry, warm climate, and neither intrudes very far upon the 

 territory of the other, so far as my experience goes to show the 

 facts. 



56. Euchloe Rosa. 



Pl.\te VII ; Figure 56. c. 



Female, Napa, Cal., 1878; unknown collector. 

 The type of Rosa was found in Western Texas, and Rosa is not 

 known to occur elsewhere, until now this specimen from California 

 comes up. The yellowest Rosa yet known, as the typical Rosa has 

 but the merest touch of yellow on underside marbling of hind 

 wing. This Rosa was said to have been taken incidentally by an 



