THE CANADIAN ENTOMOLOGIST. Ill 



confined to the dor.sal margin. The larva is of the second group, and 

 is described in the table appended. It makes a llat tvhitish mine on the 

 upper surface of the leaves of the Poison Ivy or Oak (Rhus toxicodendron). 

 Sometimes there is only a single larva in a mine, and then the mine is 

 either an irregular blotch or a narrow band, like the mark made by a 

 drop of water running over a smooth surface. But usually there are several 

 larvae in a mine— frequently six or seven and then the mine covers 

 nearly the entire upper surface. The pupa lies in a small circular depres- 

 sion in the mine, in an oval flat white cocoon. 



Variety L. ALsadisclla. Var. nor. 



The imago is not distinguishable from that of L. guttifinitella, but the 

 larva differs decidedly in its markings, as shown by the table annexed, 

 and approaches more nearly the larva of variety Ostryarella of the next 

 species (L. Coiylisella), (the larvae of which differ also, that of L. Cory- 

 lisella resembling that of Guttifinitdld). I have never found more than one 

 larva of this variety in a mine. The mine is a narrow band and blood- 

 brown in color, thus differing from the above. The mines and larvae, 

 therefore, differ, while the imagines are the same. These differences. 

 not great, are constant. AI. ex. > 4 inch. Kentucky, Pennsylvania.- 

 Abundant. Mines upper surface of leaves of the Buckeye (JEscuhts 

 glabia). 



\i. L. CoryliscUa. N. sp. 



The only difference between this species and L. guttifinitclla in the 

 imago is, that this lias a straight dorsal white streak at the inner angle, 

 internally dark-margined, and the apical dusting is much less dense and 

 much paler, and, in some lights, scarcely visible. The mine is an irregu- 

 larly circular blotch, brownish-yellow in colour, with a pale yellow border 

 on the upper surface of the leaves of the Hazel (Cory/us Americana), thus 

 differing from both of those above-named. The larva resembles that of 

 guttifinitella rather than its variety, AlsculiseUa, but differs from both, as 

 shown by the annexed table. 



Al ex. r 4 inch. Wisconsin. Kentucky. Common. 



Variety Ostryarella, mines the upper surface of the leaves of Ostrya 

 Virginica. The mine and the imago are not distinguishable from those of 

 L. CoryliscUa. But the larva differs from it, and bears the same relation 

 to it that var. s£sci/lisella does to sp. guttifinitella. Kentucky. Common. 



