COLIAS IV. 
COLIAS EURYTHEME, 1—8. 
Colias Eurytheme, Boisduval. 
EURYTHEME, Bois., Ann. Soc. Ent. Fr., Ser. 2, X., p. 286. Edwards, But. N. A., I., p. 43, pi. 14. 
Amphidusa, Bois., 1. c., p. 286. 
Edusa, Bois. and Lee., p. 59. Edusa, var. Californica, Me'netrids, Enum. Corp. Anim. Mus. Petr. n. 80. 
KEEWAYDIN, Edwards, But. N. A., I., p. 47, pi. 15. 
Chrysotheme , Bois. and Lee., p. 62. 
ARIADNE, Edwards, Trans. Am. Ent. Soc., III., p. 12. 
EURYTHEME, form ARIADNE. 
Male. — Expands from 1.3 to 1.6 inch. 
Upper side bright lemon-yellow; on primaries an orange patch extends from 
inner margin to median nervnre, or a little beyond, sometimes very pale and a 
mere tint on the yellow ground, but usually of decided color, and gradually 
passing into yellow beyond the middle of the disk; secondaries sometimes 
slightly tinted, but most often wholly yellow; the marginal borders very nar¬ 
row, scarcely half as wide as in Keewaydin. 
Under side of secondaries greenish-yellow thickly dusted with brown scales; 
the discal spots duplex, a large and a small silver spot, each edged by ferruginous 
and placed on a large patch of pink-ferruginous. 
Female. — Expands 1.6 to 1.8 inch. 
The orange shade is restricted to a patch on primaries, as in the male; sec¬ 
ondaries are greenish-yellow, much dusted, and often over the whole surface; 
the marginal border of primaries narrow, and but partly inclosing the submar¬ 
ginal spots; sometimes it is restricted to a mere edging, and there is no trace of 
the spots, unless at apex, where they may be indistinctly outlined; under side 
of secondaries pale greenish-yellow, thickly dusted ; the discal spot as in the 
male. 
Ariadne is distinguished by its small size, restricted orange patch on primaries, 
and frequent absence of orange on secondaries; the narrowness of the borders ; 
by the greenish hue of under side of secondaries and the heavy dusting, and by 
