.V> THE CANADIAN ENTOMOLOGIST. 



the markings of this species, especially about the basal portion of the 

 wings, where the black markings vary from mere dusting to distinct narrow- 

 lines or fascia?. Perhaps Clemens" variety No. 3 is the most distinctly 

 marked form, but there is no such thing as a distinct and separate variety^ 

 as the variations are of all kinds between the extremes. 



The larva is of the second group, and the mine is an irregular whitish 

 blotch on the upper surface of the leaves of different white oaks ( Qu evens 

 Alba and obtusiloba). The pupa lies on the upper surface under a thin 

 coverlet of silk. Imago in April, May and July. Alar. ex. nearly y$ inch. 

 ( ommon — Pennsylvania — Kentucky. 



There is another mine of a very distinct species.' hereafter to be des- 

 cribed, on the upper surface of the leaves of the same plant, and some- 

 times both occur upon the same leaf. Seldom more than one larva in a 

 mine. 



2. L. tiliaa 'Hi 1. A 7 . sj>. 



Glistening, snowy white ; middle portion of the anterior wings from 

 near their base to the base of the ciliae pale golden, which is produced 

 along the costa to the base — three broad silvery white fasciae dark mai- 

 gined internally: the dark margin of the third fascia widely interrupted in 

 the middle, and the pale golden very indistinct, sometimes not visible. 

 behind it ; the second fascia is about the middle of the wing. Al. ex. ^ 

 inch. Kentucky — rare. Larva of the first group, white, covered with 

 dispersed longish hairs. Mine on upper surface of Tilia /[merieana (the 

 Linden). Small, circular or ovate, brownish, mottled with whitish ; not 

 visible underneath until the lower cuticle dies. This is one of the anoma- 

 lous mines and lame before referred to. 



3. J,, lucetielld) Clem., loc. eit. supra. 



besides the markings mentioned by Dr. Clemens, nearly all my speci- 

 mens have the silvery band dark margined strongly by a dorsal black 

 streak, and have also a distinct black costal spot at the base of the ciliae. 

 Al. ex. \( in. nearly. Pennsylvania and Kentucky Common larva of 

 tlie 1 st group — pupa in thin whitish silken cocoon. 



Mines the under surface of leaves of Tilia Americana. It first sepa- 

 rates the lower cuticle, between two veins, over the whole surface of the 

 mine, and then picks out the parenchyma in specks above, so that the 

 incomplete mine resembles and may be mistaken for that of L. iiliacella, 

 but the perfect mine is white upon both surfaces. 



