276 AMERICAN MICRO-LEPIDOPTERA. 



EEE. Three large white dorsal streaks before the tornus, curving back- 

 ward leucotliorax. 



DD. With a complete median fascia. 



E. Three posterior costal streaks inartiella. 



EE. Two posterior costal streaks. 

 F. Dorsal half of the wing below the fold dark brown. 



G. A silvery basal streak in the fold inorriNellH. 



GG. No basal streak ulilerella. 



FF. Dorsal half of the wings not darkened g<'iiiinea. 



CC. Without an apical dot. 



D. Oblique costal and dorsal streaks, rarely meeting; no straight fascia, 

 sometimes one acutely angulated fascia. 



E. Basal streak very short and indistinct aiironiteiiN. 



EE. Basal streak long. 



F. A median angulated fascia of equal width throughout ; white marks 



dusted internally celti»«ella. 



FF. Fascia, if present, formed by the meeting of opposite streaks. 

 G. With three long dorsal streaks before the tornus. 



H. Five costal streaks ai'geiitiiiof ella. 



HH. Two costal streaks, first opposite second dorsal streak. 



occitaiiica. 

 GG. With two dorsal streaks before the tornus. 



H. Basal streak unmargined, or margined toward its apex only. 



I. Markings usually very indistinct and ill-defined ; sometimes 



a median angulated fascia apit'iiiigrella. 



II. Markings well defined; never with a median fascia. 



J. Basal streak confluent with the upiier edge of the first 

 dorsal streak. 



K. Forewiugs pale, grayish ... -salicivorella. 



KK. Forewings not grayish deceptiiNella. 



JJ. Basal streak not confluent with first dorsal streak. 



K. First pair of streaks very oblique and extended along 



the margins to base ba!«i»ilrigella. 



KK. First pair of streaks not extended to base. 

 L. Apical third of basal streak bent toward costa. 



M. Margin of first dorsal streak bent backward on 



fold >«cufl«lerclla. 



MM. Margin of first dorsal streak not bent l):ickward 



on fold diapliaiiella. 



LL. Basal streak straight or curved downward. 



ill can Vila. 

 HH. Basal streak dark margined toward the costa. 



I. Costal margin white from base to near one-third. 



popiiliella. 



II. Costal margin not white from base. 



.J. Three costal streaks inaiiniaIiroli«'ll]i. 



JJ. Four costal streaks. 



