354 William T. M. Forbes 



Key to the species 



1. Fore wing with two silvery streaks from costa; hind wing with, a silver 



bar ' 1. inflatella. 



1. Fore wing with silver broken into spots; hind wing with white only. 



2. Fore wing white at base 6. leucooasis. 



2. Fore wing ochreous and brown at base. 



3. With silver markings in specular region only 5. extrincicella. 



3. With silver markings on costal half of wing outwardly. 



4. Fore wing with little or no yellow at base, but with two prominent trans- 

 verse white f ascige 2. onustana. 



4. Fore wing with more yellow at base, and without white fasciae. 



5. 9 mm. Medial area powdery like ground 3. gnaphaliella. 



5. 13 mm. Median area even chocolate brown 4. carduiella. 



I. Fore wing triangular, with marked anal angle; hind wing with all veins pre- 



served; R running to apex (Choreutis). 



1. C. inflatella Clemens. Dark brown, with some ochre toward apex; disc dusted 

 with white; some silvery marks near base; a curved postmedial band and a 

 straight subterminal one converging toward anal angle; a couple of white spots 

 on costa. Fringe pale, with fuscous center-line. Hind wing fuscous, with a silver 

 subterminal bar, and dot at anal angle. All the silver typically greenish but 

 violet in the commoner variety virginiella Clemens. 9 mm. 



June and July; September. Larva skeletonizing Scutellaria lateriflora, in a 

 slight web bending the leaf up and the edges together; in early September. Cocoon 

 usually in an uneaten leaf. 



Toronto, Canada, to Xorth Carolina and Washington. Xew York: Wilmington, 

 Batavia, Ithaca, West Farms. 



II. Fore icing olunter, with more arched margins, and anal angle not marked; 



M 3 of hind wing normally lost; R running to costa (Porpe). 



2. C. onustana Walker. Brown; yellowish at base of cell, with two lead-gray 

 streaks at base of wing and several spots outwardly in black patches; terminal line 

 double, fuscous. 9 mm. (ohioensis Zeller). 



June and July. 



Canada to Pennsylvania, British Columbia, and California. Xew York: Mt. 

 Whiteface, Uphill Brook (Mt. Marcy), East Aurora, Ithaca. 



3. C. gnaphaliella Kearfott. Light brown or fuscous, with bright ochre yellow 

 patches at base, defined by the lead-colored streaks on costa, Cu, and inner margin. 

 Outwardly, with lead-colored and black patches as in C. onustana. With white- 

 dusted areas, tending to form a band across apex from middle of costa to middle 

 of outer margin, and a broader and less regular one from before middle of costs 

 to anal angle, the two often connected along lower edge of cell. Hind wing fuscous, 

 with a short white line. 9 mm. 



Generally distributed. May to July; September and October. Larva on Anten- 

 naria and Gnapluilium polycephalum ; a leaf miner when young later in s sticky 

 web mixed with frass; gregarious in spinning its cocoon. 



4. C. carduiella Kearfott. Closely similar to G. gnaphaliella : the white dash 

 on the hind wing, on the average, weaker, sometimes wanting; the two powdery 

 areas almost always entirely separate; the median area, and the subterminal 

 region before the black mark, even bright chocolate brown. 13 mm. 



Larva pale yellow. Head, cervical shield, and true legs light brown; a black 

 spot low down on side of head; tubercles black, stronger on thorax. Social, in 

 pith of stems of Carduus spinosissimus. in June. Two broods. Moth in July 

 and in November. Very close to C. pretiosana of Europe. 



