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 mart id la. 



EE. Two posterior costal streaks. 

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



G. A silvery basal streak in the fold morrisella. 



GG. No basal streak uhlerella. 



FF. Dorsal half of the wings not darkened gemmea. 



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 auronitens. 



EE. Basal streak long. 



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



dusted internally celtisella. 



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

 G. With three long dorsal streaks before the tornus. 



H. Five costal streaks argentiiiotella. 



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



oecitauica. 

 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 apiciiiigrella. 



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



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

 dorsal streak. 



K. Forewings pale, grayish salici vorella. 



KK. Forewings not grayish deceptusella. 



JJ. Basal streak not confluent with first dorsal streak. 



K. First pair of streaks very oblique and extended along 



the margins to base basistrigella. 



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 scudderella. 



MM. Margin of first dorsal streak not bent backward 



on fold diaphanella. 



LL. Basal streak straight or curved downward. 



iiicanella. 

 HH. Basal streak dark margined toward the costa. 



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



populiella. 



II. Costal margin not white from base. 



J. Three costal streaks malimalifoliella. 



JJ. Four costal streaks. 



