(EDEMATOPHOKUS. 35 



it ; the cilia are mottled alternately white and 

 greyish fuscous. 



Hind wings cinereous. 



Abdomen greyish, mottled and dusted with fuscous. 



The legs greyish white, slightly thickened at the 

 joints, which, with the extremities of the whitish 

 spurs, are touched with greyish fuscous. 



On the underside the wings are all cinereous, the 

 costa and the cilia at the anal angle of the fore 

 wings and the body being whitish. 



Expanse 29 millims. 



Eight specimens bred from larvae feeding on a 

 species of Artemisia early in May 1872, on Rouge 

 River, Southern Oregon. This and the two following 

 species are all very nearly allied to the European 

 0. lithodactylus of Treitschke. 



(Edematophorus cretidactylus *. 



Pterophorus cretidactylus, Fitch, Nox. Ins. K Y,, Reps. 1 & 2, p. 142. 

 (Edematopliorvj cretidactylus, Zell. Verh. z.-b. Ges.TVien, xxiv. p. 444. 



Several examples supposed at first to belong to the 

 species described above as 0. grisescens, but differing 

 in size and in the intensity of their colouring, were 



* It is to be regretted that !Mr. Fiteh dicf not adopt a different 

 name for this species, cretidactylus being open to the same objection 

 as sulphureodactylus, carduidactylus, &c. I would suggest yypso- 

 dactylm, as conveying the same meaning in a preferable form. 



D2 



