19G 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 setce 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 larvce 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 {Pop2iliis tremuloides') 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 /*. 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 



