throughout, with a black discal dash. A pale terminal line; 

 fringes of forewings as on upper side. Head and thorax gray- 

 ish, corresponding with the adjacent portions of the wings. 

 Abdomen darker. 



Habitat : Salt Wells Valley. Kern Co., Calif., Oct. 14, 23, 

 1909, collected by Leo Goeppinger. Two males ; one perfect, the 

 other slightly greasy, but otherwise perfect. 



This species although very distinct from any other species 

 is evidently related to brassicae, (Riley) (echinocystis, Behr). 

 It is evidently a desert form, very distinct in appearance by 

 the peculiar streaked white wings, and loss of all the dark 

 color of brassicae. If it is considered a geographical form, it 

 may be given subspeeifie rank. As remarked by Grote the gut- 

 tiform spot beyond the silver mark in brassicae is often sep- 

 arate, and here the two distinct white elongate markings of 

 deserta are evidently the descendents of these spots. 



The Salt AVells Valley is in the Lower Sonoran zone of the 

 Colorado Desert faunal area, with its characteristic assemblage 

 of plants and animals. 



so 



