28 OX1 7 PTILUS. 



I have this species from Sacramento in April, 

 from 'Mendocino County in May and June, and from 

 Shasta County as late as the 24th of July, 1871 ; 

 also from Fort the Dalles, on the Columbia River, in 

 April, and from Rouge River, in Southern Oregon, in 

 May 1872. 



In spite of this very wide range of distribution, 

 the specimens vary scarcely at all in colour and 

 markings, although they differ somewhat in size. 



It approaches very closely to the English Oxyptilus 

 teucrii of Jordan, Ent. Mon. Mag. vi. p. 14, differing 

 in the usually more conspicuous whitish spot on the 

 first fourth of the dorsal margin, in the hinder margin 

 of the second lobe of the fore wings being less clearly 

 defined against the base of the pale lunule, in the far 

 more conspicuous white base of its abdomen, arid in 

 the more striking whiteness of some part of the third 

 lobe of the hind wings. 



I have an impression (in confirmation of which, 

 however, I can find no written memoranda) that this 

 insect flew in California among plants of a species of 

 Teucrium; and it was with some hesitation that I 

 was brought to believe in its distinctness from our 

 European 0. teucrii; but a careful comparison and 

 renewed examination, consequent upon a correspon- 

 dence with Prof. Zeller, has enabled me clearly to 

 distinguish them. 



