154 William T. M. Forbes 



3. Larva on grape or Ampelopsis. 



4. Middle of apical region filled with a gray patch 7. ampelopsiella. 



4. Middle of apical region white or golden. 



5. Mine slender and broadly filled with frass 5. vitifoliella. 



5. Mine broad, without central frass-line 6. vitiaenella. 



1. P. insignis Frey and Boll. Head and thorax lead-colored; fore wing orange; 

 inner margin gray to middle, the gray area almost reaching costa at base, costal 

 edge black, expanding into a black-edged, lead-colored triangle at middle; similar 

 costal and dorsal lead-gray spots beyond middle; fringe black -barred. Sometimes 

 with a little white in the costal black streak. 



Larva on Erechtites. Moth in July and September. 

 Southern Ohio; Missouri; Kentucky. 



2. P. liriodendrella Clemens. Similar to populiella. Apex broadly yellow; with 

 a broad, yellow, longitudinal streak through middle of Aving, joined by the tip of 

 the oblique, postmedial streak; all markings finely edged with brown. 6 mm. 



The larva makes a convoluted tract-mine, with a central frass-line, in the smaller 

 terminal leaves of the tulip tree, in July. 



3. P. magnoliella Chambers. Similar to P. liriodendrella; the brown edgings 

 weaker, and absent from the basal streak. 



Larva like that of the last species on various Magnolias. 



4. P. populiella Chambers. White. Antennae pale yellowish; eye-cap white; fore 

 wing somewhat silvery; a dark gray, fine and broken, excurved postmedial fascia, 

 with three slight dark bars in the fringe between it and apex. A strong black 

 apical dot, from which extend two or three dark lines, in apical fringe; also an 

 oblique streak before it in dorsal fringe; a slight, yellow shade before first fascia, 

 and at apex. 6 mm. 



The larva forms a broad mine of the shining, snail-track type, but with distinct 

 central lines of frass. It feeds on aspen and other poplars. 



Apparently common and general in distribution, but rare in collections. New 

 York: Hemlock Lake (bred). 



5. P. vitifoliella Chambers. Similar to P. populiella; generally with black mark- 

 ings rather more distinct, the second fascia usually extending onto the wing mem- 

 brane, and yellow areas rather less distinct. 4% mm. 



Mine on grape, like that of P. populiella, with quite distinct frass line. 

 Generally distributed; the commonest of the grape Phyllocnistises. New York 

 ( Beutenmuller ) . 



6. P. vitigenella Clemens. Imago often indistinguishable from the other white 

 species, but usually with a 'gray, antemedial shade on inner margin and with 

 heavier and more extensive black markings; the second fascia, however, in the 

 fringe only. 



The mine is a narrow, almost invisible snail-track, without a frass-line; some- 

 times it is formed on Ampelopsis, and then is much contorted. 



7. P. ampelopsiella Chambers. Similar to P. populiella and vitigenella; with 

 bars heavier, and the postmedial one distinctly double; apical region with a good- 

 sized gray area on dorsal margin, in which the costal dark streaks often end; 

 and, in some specimens, with a distinct, longitudinal, gray streak on basal half, 

 and gray antemedial patch. Yellow shading distinct. 



Mine a narrow and much contorted tract, often fusing into a blotch ; on 

 Ampelopsis. 



8. P. liquidambarisella Chambers. Moth like populiella; slightly variable: the 

 markings typically reduced to a minimum, with hardly any yellow. 



Mine of snaiLtrack type without central frass-line; on sweet-gum. 



