24 Journal New York. Entomological Society. [Voi. v. 



posterior end of alimentary canal forms a blackish shade vvnich looks 

 like a mark at first glance. Thorax higher than head. Sits flat on the 

 venter, usually curled spirally when at rest. Five stages were observed, 

 but not consecutively. 



Found on the poplar at Plattsburgh, N. Y., and at Jefferson High- 

 lands, N. H. 



Pontania populi Marlatt. 



This is evidently what Mr. Marlatt had in mind when he said of 

 the habits of the larvae of Pontania, " at least one America species de- 

 velops in the rolled or folded edge of the leaf."* The present species 

 forms at first a small gall, but soon the leaf rolls over, gall and all, form- 

 ing two or three turns and the larva lives in the tube so formed, without 

 spinning any sort of web. 



There are probably five larval stages. The larva remains in the 

 gall up to as late as the fourth stage, but is usually out to feed in the 

 third. It may be in the rolled part permanently in stage IV. 



Gall. — A low irregular swelling on the upper side of the leaf, the 

 nearest veins enlarged and tending to curve backward, rolling the leaf 

 with the back side inward. Under side of gall thin, flat or irregularly 

 rugose ; above scarcely much thickened but folded up. Green or yel- 

 lowish, an ill-defined swelling about 5 mm. in diameter, concealed in 

 the rolled leaf. 



Stage II. — (In gall.) Head pale brown, paler over the clypeus ; 

 body shining whitish; width of head .36 mm. 



Stage III — Head pale brown above clypeus; width .55 mm. 

 Body annulate, shining, no marks ; anal prongs dark. 



Stage IV. — Head very pale brown ; width .7 mm. Body colorless. 



Stage V. — (In leaf.) Head all pale brown ; width i.o mm. Body 

 segments 3-annulate, whitish, scarcely shining, food green ; two dusky 

 brown corneous patches precede the dark tipped anal prongs. 



The larvae never eat the whole leaf, but the parenchyma only, even 

 in the last stage. They spin small brown cocoons. 



Found on Populus grandidentata at Fort Lee, N. J. There is 

 more than one brood in the season, the larvae infesting the successive 

 leaves of young shoots. 



Pontania terminalis Marlatt. 



Allied to the preceding. Egg deposited under the lower epidermis 

 forming a small gall-like swelling ot the type of P. 1)0puli^ but less pro- 



* U. S. Dept. Agriculture, technical series, No. 3, 1896, p. 8. 



