June, I902.] KeARFOTT : On NoRTH AMERICAN ChOREUTES. 123 



a small black patch and below a large quadrate one, cut by a whitish line trans- 

 versely ; silvery scales along costa basally, middle of wing, subterminally and in the 

 black patch. Hind wings brown, immaculate. Below a faint, irregular, whitish, sub- 

 marginal line on hind wings and two costal dots on fore wings. Expanse 14 mm." 

 " One male. California (Coll. Beutenmiiller). U. S. Nat. Mus., type no. 

 4428." 



I consider this a good species ; it can readily be separated from 

 silphiella by the absence of the ochreous patch at base of front wings, 

 in place of which is a whitish curved band, convex outwardly, just 

 beyond base and extending from costa to hind margin. 



The pattern of coloration and metallic scales on the apical half of 

 front wings is not unlike leucobasis, inasmuch as in each species there 

 is a large wheel-like or circular mark ; in occideiiteUa the upper part is 

 defined by two white dashes on the costa, enclosing an area more or 

 less suffused with whitish scales, the lower part is defined by a pair of 

 velvety black spots. Dr. Dyar described the species from one speci- 

 men labelled "California." In my collection is one specimen from 

 Yellowstone Park, Wyo. , taken by Mr. Burrison late in June or early 

 July, 1900. My specimen differs from type only in that there is less 

 white in the circular mark referred to. 



This species can be distinguished by : ( i ) Head, thorax and basal 

 half of fore wing brown, (2) curved white line from costa to hind 

 margin, close to base and (3) hind wings brown, not marked with 

 white lines or dashes. 



Choreutis coloradella, sp. nov. 



Head, thorax, fore wings dark brown, sprinkled with lilaceous scales; basal half 

 of fore wings broadly of ground color ; crossed in the middle by a faint curved lilaceous 

 whitish band, sometimes obsolete. Outer half washed with lilaceous, except at 

 margin, this area forming a large rounded patch reaching costa and inner margin, 

 obscurely divided in the upper half by blackish veins ; containing below an elliptical 

 patch of black slightly raised scales, truncated outwardly, divided by an almost verti- 

 cal line of whitish or faintly orange-tinted scales, marked with a few metallic scales. 



A faint oblique metallic line from costa basal third to this patch below middle. 

 A small curved subapical metallic line. In some specimens ground color becomes 

 almost white in a dash bordering black patch above. Fringe blackish, interlineated 

 with white. Hind wings blackish, fringe interlineated with white. Fore wings dark 

 gray below, slightly washed with whitish towards apex, no definite lines. Hind wings 

 washed with whitish except on veins. Expanse, 13 to 18 mm. 



Described from six specimens. Durango, Colo. (Dietz), south- 

 western Colo. (Dietz), Colorado (Fernald), top Las Vegas range 11,- 

 000 feet. New Mexico (Cockerell), Sitka, Alaska (Kincaid, Harriman 



