96 William T. M. Forbes 



Synopsis of species by food plants 

 Salix spp., willow: 



(1) N. pallida; mine linear, narrow at the end. 



(2) N. fuscotibiella; mine linear, gradually broadening, club shaped at the 



end, sometimes blotch-like toward the end. 

 Populus grandidentata, poplar : 



(1) E. populella; globular swelling of petiole close to leaf. 

 Populus deltoides, Cottonwood: 



( 1 ) N. populetorum ; whitish mine, gradually increasing to a breadth of 2 to 

 2.5 mm. at end. 

 Myrica carolinensis, bayberry : 



(1) N. obscurella; mine serpentine, very narrow. 

 Juglans cinerea, butternut: 



( 1 ) N. juglandifoliella. 

 Juglans nigra, walnut: 



( 1 ) N. juglandifoliella ; serpentine mine, very gradually increasing in breadth. 

 Carya spp., hickory: 



(1) N. juglandifoliella; serpentine mine, very gradually increasing in breadth. 



(2) N. trinotata; linear track, expanding into a blotch. 

 Corylus americana, hazel : 



(1) N. corylifoliella ; very narrow, serpentine mine, scarcely broader than the 



larva. 



(2) N. quadrinotata; narrow linear mine, expanding into an irregular blotch. 

 Ostrya virginiana, hop hornbeam: 



(1) N. corylifoliella; very narrow, serpentine mine, scarcely broader than the 



larva. 



(2) N. ostrycefoliella; linear track, gradually reaching a breadth of 2 mm. 



at the end. 

 Garpinus caroliniana, hornbeam : 



(1) N. corylifoliella; very narrow, serpentine mine, scarcely broader than the 



larva. 



(2) N. quadrinotata; narrow linear mine, expanding into an irregular blotch. 

 Betula spp., birch: 



( 1 ) N. corylifoliella ; very narrow, serpentine mine, scarcely broader than the 



larva. 



(2) N. ostrywfoliella; linear track, gradually reaching a breadth of 2 mm. 



at the end. 

 Castanea dentata, chestnut: 



(1) N. castanecefoliella; long, contorted mine, with central line of frass; larva 



green. 



(2) N. saginella; shorter, whitish mine, with frass in a central line or dis- 



persed; larva green. 



(3) N. latifasciella; serpentine mine; frass at first in a broad line, later, 



dispersed, and toward end gathered into a band; larva green. 



( 4 ) N. similella ; see under Quercus ( 8 ) . 



(5) E. castanece; larva makes a gall encircling twig. 



( 6 ) E. phleophaga ; larva makes a serpentine track in the bark. 

 Quercus spp., oaks: 



(1) N. terminella; mine a broadening, linear tract, 3.5 mm. wide at the end; 



larva yellow. 



(2) N. saginella; whitish, linear mine with frass in a central line or dis- 



persed; larva green. 



(3) N. latifasciella; serpentine mine; frass at first in a broad line, later, dis- 



persed, and toward the end gathered into a band; larva green. 



(4) N. flavipedella ; linear mine; a short, indistinct part followed by a trans- 



parent area, and then a gradually broadening, serpentine track, not 

 transparent, but easily visible above; larva green. 



