196 WILLIAM T. M. FORBES 



DD. Dorsal margin not white. 



E. With two costal streaks or spots before the white streak or spot 



forming the anterior edge of the apical dusting. 

 F. Ground color of wings pale, with a coppery lustre toward the 



apex; marks very indistinct 58. cervina. 



FF. Ground color saffron; marks white 57. platanoidiella. 



EE. With at most one costal streak before the white streak or spot 



forming the anterior edge of the apical dusting. 



F. Median fascia but slightly angulatecl; other white marks small or 

 absent. 



., G. Costal and dorsal streaks absent 64. fasciella. 



GG. Costal and dorsal streaks present 65. castaneaeella. 



FF. Median fascia sharply angulated; white marks conspicuous. 



G. First dorsal streak long, oblique, curved 59. fietcherella. 



GG. First dorsal streak perpendicular. 



H. Marks dull white, faintly margined 61. betulivora. 



HH. Marks shining white, strongly margined. 



I. External dusting at angle of fascia produced backward; 



apex densely dusted. 



,T. Hind tarsi white 62. bethunella. 



JJ. Hind tarsi spotted with black 63. picturatella. 



II. External margin of fascia not produced 60. arcuella. 



A A. Two straight, or nearly straight, fasciae, nearer the base on the dorsal margin. 



B. No costal streaks beyond fasciae 73. tubiferella. 



BB. A costal and a dorsal streak at three-fourths. 



C. Without a paler streak at the base of the dorsal margin. 



D. Apical dusting, black on a whitish ground, and extended to the 



tornus 66. guttifinitella. 



DD. Apex velvety black, dusting not extended to tornus . . 67. obstrictella. 

 CC. With a white streak or paler shade from inner angle to fold. 



D. First fascia and its dark margin broken near the costa . . 68. cescuUsella. 

 DD. First fascia complete. 



E. Color deep reddish 69. hamameliella. 



EE. Color paler ocherous. 



F. Dorsal streak at tornus very oblique and pointing toward apex. 



G. Apex not dusted 70. aceriella. 



GG. Apex dusted 71. ostryarella. 



FF. Dorsal streak at tornus less oblique 72. corylisella. 



4S. L. hamadryadella Clemens. Head, thorax, and fore wings white. Wing 

 markings as follows: a small patch of black scales at base of costa; a slightly 

 angulated band of black dusting on an ocherous ground, followed by an angulated 

 line of black dusting; an angulated ocherous fascia at one-third, broadly dusted 

 internally with black scales; a second, similar fascia just beyond the middle; the 

 space between these two fasciae marked by a line of black scales; a similar line 

 of scales between the second fascia and costal and dorsal patches, which are sep- 

 arated from one another in the middle of the wing by a patch of dark dusting; 

 apex ocherous. dusted with black. 6.5-8.5 mm. 



Irregular, whitish blotch mine on upper side of leaves of oak, especially Quercus 

 alba, rarely (perhaps accidentally) on Magnolia, and Ostrya. 



49. L. cincinnatiella Chambers. Fore wings shining ocherous; a curved white 

 streak from base of inner margin to fold, dusted outwardly with black scales; two 

 angulated fasciae, at one-third and one-half, respectively, dusted externally with 

 black scales, the dusting produced at the angle; at two-thirds a small, dusted. 



