196 Journal New York Entomological Society. [Voi. v. 
slightly yellowish tinged with green, principally from the food. Seg¬ 
ments 4-annulate, the fourth small, three rows of fine but rather long, 
colorless setoe on the first three annulets. Thoracic feet rather large, 
colorless; abdominal small, on joints 6-11, 13, colorless; short, blunt 
anal prongs, also colorless. No marks and the head is pale brown. 
The larva eats the whole leaf when it emerges, sitting on the edge, the 
body curled down a little on one side of the leaf. The larvae will rasp 
with their prongs when in the houses if disturbed. At the end of the 
stage the larvae enter the ground. Body all pale emerald green, the 
head brown. Anal prongs rudimentary, brownish, situated on the edge 
of the anal flap. 
Found on the small leaved poplar yPopulus tre77iuloides ) at Fort 
Lee, N. J. I have also seen the characteristic houses on the poplar 
near New York City and at Jefferson, N. H. There is only one brood 
a year, the larvae disappearing at the end of May or a little later. The 
houses remain on the tree much longer. Cocoons formed on the 
ground. The fly corresponds with Mr. Marlatt’s description of the 
female; the male is not like his description. 
Pontania pallicornis Norton. 
With the habits of P. robusta but living on the willow. The 
smooth leaves are closely folded over, the house long on the narrow 
leaf, 25 to 40 mm., about one-fourth of the leaf turned over, so that the 
outer edge just reaches the midrib. The folded part at the angle where 
it is bent is slightly swollen and yellowish, caused by little scattered 
patches eaten from the under side. 
Egg slits under the lower epidermis half way between the midrib 
and margin. 
Stage I. —Head brownish, not black, width 2 mm. Body as in the 
next stage, small, colorless, whitish. The larva was seen sitting by the 
egg slit, no food in the alimentary canal and no marks of eating, yet a 
good folded house, the leaf swollen between the veins. This was a 
very young leaf. 
Stage II. —Head shining blackish brown, nearly black ; eye black; 
width, .3 mm. Body colorless, the food green by transparency. 
Stage III. —Head brownish black, paler than before; width .4 
mm. Body the same, but the anal end appears black from the con¬ 
tained frass, intensified by a black subdorsal patch which is now pres¬ 
ent. Prongs short, blunt, black. 
Stage IV. —Head pale, dotted with brown over the vertex, a dark 
