218 Zoology of Colorado 



Inner edge of broad black band on anterior wings undulate, 

 but not concave, forming half a circle; the band in females 

 spotted with yellow .... Eurymus eurytheme Boisduval. 



Deep orange, appearing almost brown in flight (at very high 

 altitudes) . . . Eurymus meadi Edwards. 



1 0. With bright orange patch near apex of fore wing 



Anthocharis sara julia Edwards, male. 

 Wings without such patches 11. 



1 1 . Hind wings beneath beautifully marbled (not longitudinally 



streaked) with green, this color really due to a mixture 



of yellow and blackish scales; small butterflies 12. 



Hind wings not thus marked 14. 



12. Hind wings beneath with the green consisting roughly of 



three transverse bars, the larger two joined by a cross-bar 

 forming a sort of H (Boulder, taken by F. Becker, May 

 20, 1 922) Zegris olympia Edwards. 

 Hind wings beneath with much more green, approaching a 

 checker-board pattern 13. 



13. Larger, expanse between 40 and 50 mm. (common; larvae 



on Cruciferae) Euchloe ausonides Boisduval. 

 Smaller, expanse about 30 to 35 mm., green markings on under 

 side of wings heavier, and the ground color pure white 

 (more greenish white in ausonides) (a Calif ornian form, 

 reported by Edwards as extending to Colorado) Euchloe 

 creusa hyantis Edwards. 



14. Anterior wings with upper apical margin broadly black, on 



which are white spots; a curved black band along upper 

 margin of wing (locally common in the mountains, the 

 caterpillar feeding on pine. Taken by S. A. Rohwer in 

 Four Mile Canyon and along Lefthand Creek in Boulder 

 County) .... Neophasia menapia Felder.* 

 Anterior wings not thus marked 15. 



1 5. Anterior wings with a broad black border, spotted with white, 



extending from apex to base of outer margin . . . Eurymus 

 eurytheme, female form alba Strecker. 

 Anterior wings without such a border 16. 



♦For a good account of this butterfly and its injury to pine trees, see J. C. Evenden. Joum. 

 Agricultural Research, 1926, p. 339. 



