18 PROCEEDINGS OF THE ACADEMY OF [Part I 



similar dark fascia at two-thirds, convex inwardly and bordered 

 inwardly by a broken line of white scales. In some specimens, the 

 effect of these two white margins with the whitish dusted scales 

 between them is that of a bi-concave dusted white-margined fascia. 

 The second dark fascia sometimes passes imperceptibly into the white 

 dusted apex, sometimes is more or less limited outwardly by an 

 incomplete line of white scales. Marginal line of scales fuscous, 

 cilia gray. Hind wings gray. Legs white, dusted with black, hind 

 pair most densely. Thorax beneath nearly pure white, abdomen 

 dusted with black. Expanse, 9-11 mm. 



On cliffs on the side of Goat Mountain, above Going-to-the-Sun 

 Chalets, July 18, flying in the sun. 



Type (cf) and four paratypes (cf and 9). 



In general appearance quite different from the other two Amer- 

 ican species of the genus, but with the same type of markings. 



GRACILARIIDAE. 

 Lithocolletis oregonsis Walsingham. 



Mines collected near Baring Creek, Julj^ 20, on Symphoricarpos 

 sp. The mine is a small tent mine on the underside of the leaf, 

 with epidermis much wrinkled and a patch of leaf tissue in the 

 middle of the mine not consumed. Imago, Juh' 28. The species 

 was described from Oregon. 



Acrocercops astericola F. and B. 



McDermott Lake, July 24. I also have specimens of this species 

 from southern Oregon. 



Gracilaria acerifoliella Chambers. 



I refer with little doubt to this species, specimens reared on a 

 bush maple (Acei^ sp.), near Going-to-the-Sun Chalets. 



In these specimens, there is none of the brown dusting described 

 by Chambers for this species, but the wings are pale brownish or 

 reddish ochreous, with purple reflections and a pale costal triangle 

 produced along the costa. Inasmuch as similar undusted forms 

 occur in other species (for example, G. ostryaeella Chambers), the 

 identification is probably correct. The larval habits agree closely 

 with those described for G. acerfoliella; a large leaf is often entirely 

 folded up by the time the larva finishes eating. 



Larvae collected July 18, imagoes August 6-14. 



Gracilaria alnivorella Chambers. 



The larvae were very common at the lower altitudes on alder. 



