96 WILLIAM T. M. FORBES 



Synopsis of species by food plants 



spp., willow: 



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



(2) .V. fuscotibirlla ; 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) A 7 , obscurella; mine serpentine, very narrow. 

 Juglans cinerea, butternut: 



( 1 ) A 7 , juglandifoliella. 

 Juglans niyra, walnut: 



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

 Carya spp., hickory : 



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



(2) A 7 . trinqtata; linear track, expanding into a blotch. 

 Corylus americana, hazel : 



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



larva. 



(2) A T . 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) A 7 , ostrycefoliella; linear track, gradually reaching a breadth of 2 mm., 



at the end. 

 Carpinus caroliniana, hornbeam : 



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



larva. 



(2) A 7 , 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) A 7 , ostrycefoliella; linear track, gradually reaching a breadth of 2 mm. 



at the end. 

 Castanea dentata, chestnut: 



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



green. 



(2) A 7 , saginella; shorter, whitish mine, with frass in a central line or dis- 



persed; larva green. 



(3) A 7 , latifasciella ; serpentine mine; frass at first in a broad line, later, 



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

 ('4) A T . 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) A", 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) A 7 , 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. 



