INSECUTOR INSCITI^ MENSTRUUS 61 



1912, at East River, Connecticut; adults emerged September 

 3 to 25, 1912. 



This insect appears difficult to rear, the four specimens 

 having been obtained from a large number of cones containing 

 active and apparently healthy larvae. A careful examination 

 of the leaves on which the cones were found did not reveal 

 anything which looked as if it might be the mine of this 

 species. The cone is very peculiar. It is not made by rolling 

 the leaf, but by bending under a single lobe and fastening down 

 its edges to the flat surface of the under side of the main 

 portion of the leaf. Along the margin where the cone is 

 fastened together the leaf is eaten through in a row of small 

 holes. 



The larva is whitish in color, but appears brownish between 

 the segments, giving it a ringed appearance. It seems to 

 be more active than most other Gracilaria larvae, and there 

 is an unusually long interval between its early stages and the 

 appearance of the imago. Larvae which were apparently full 

 grown the first week in July, wandered about the breeding 

 jars for nearly a month before spinning their cocoons, and 

 did not emerge as adults until September. 



This species is probably also to be found on other oaks 

 than Q. nigra L. Cones similar to those above described were 

 found on red oak. None were, however, noticed on any of 

 the white oak group. 



Gracilaria ostryaella Chambers. 



In the Ent. News for April, 1912, Miss A. F. Braun notes 

 that the single specimen which she reared from a larva mining 

 the upper side of a leaf of Ostrya, was identical with those 

 obtained from larvae mining the under side of Carpinus. The 

 writer was enabled through the abundance of the material 

 afforded, during the summer of 1914, to obtain a series of 

 19 specimens from Ostrya and 25 from Carpinus. Although 

 there was a great variation in the specimens, taken as a whole, 

 it was not possible to find any satisfactory characters for 

 separating the two series. It hardly seems possible that the 

 same species should have such different habits when feeding 



