140 PAPERS BY DE. P>. CLEMENS. 



silvery-white costal streaks, all black-margined internally 

 except the first, which is very oblique and continued along 

 the costa to the base of the wing. All the costal streaks are 

 short, except the first. On the inner margin are two con- 

 spicuous silvery dorsal streaks, dark-margined internally, 

 the first very large, and placed near the middle of the inner 

 margin, the second opposite the third costal streak. At the 

 tip is a small, round black spot, placed above the middle of 

 the wing ; cilia silvery-gray, tinted with saffron. Hind- 

 wings grayish-fuscous ; cilia paler. 



The specific name used by Dr. Fitch being already in use 

 to designate a European species of this genus, it was neces- 

 sary to change it. I feel pleasure, therefore, in dedicating it 

 to the industrious observer who first described it, and who is 

 adding so much to our knowledge of entomological Natural 

 History. 



T^Jh/oiX. tubiferella. Head silvery- white. Antennas fuscous, 

 slightly annulated with white ; basal joint pale saffron. 

 Fore-wings pale saffron, with two silvery-white moderately 

 broad bands, black-margined externally, one near the base 

 and the other on the middle of the wing, and both some- 

 what oblique ; cilia of the general hue. Hind-wings dark 

 grayish, cilia the same. 



The larva belongs to the second larval group of this genus, 

 but the body is much more contracted than that of any other 

 larva I have- seen. Its form is almost that of a flattened 

 ovoid, the rings separated by deep incisions, and each forming 

 in the sides a projecting mammilla. 



The larva mines the upper surface of the leaves of oaks in 

 September, and doubtless also in the summer months. The 

 mine is a linear tract, sometimes curved or wavy, gradually 

 increasing in breadth from the beginning to the end, or as 

 the larva increases in length, with the " frass" deposited on 

 each side of the tract and marking its outlines by two black 

 lines. The position of the larva within the mine is likeAvise 

 a peculiar one, as it is always placed transversely to its 



