(LITHOCOLLETIS) NOVEMBER, 1859. 71 



The apical spot black; hinder-marginal line dark brown, 

 cilia silver-gray. Hind- wings silver-gray, cilia the same. 



Found in the pupa state in the same leaf as the foregoing 

 in the latter part of September. The pupa is suspended 

 within the mine in a very thin silken web. The perfect in- 

 sect appears early in May. 



7. L. obscuricostella. Head and frontal tuft silvery. 

 Thorax very pale golden. Fore-wings pale golden, with 

 a silvery median stripe from the base, black-margined to- 

 ivard the costa, extending to the middle of the wing; with 

 four silvery costal streaks, the first very oblique and rather 

 long, and all except the last black-margined internally, the 

 margin of the first being long and the continuation of a 

 black streak from the base along the extreme costa. Three 

 silvery dorsal streaks, the first quite long, obliquely curved 

 and opposite the first costal streak, and the first two black- 

 margined internally; the second dorsal obliquely opposite the 

 third costal streak. Apical spot black : hinder-marginal line 

 black, cilia grayish. Hind-wings bluish-gray, cilia the same. 

 Abdomen black, tipped freely with yellow. 



The larva mines the leaf of Ostrya Virginica (hop-horn- 

 beam) in September. I have no description of the larva, 

 supposing at the time of capture it was the same as the 

 succeeding species. The pupa was not contained in an 

 ovoid cocoon made of " frass" and silk. The imago appears 

 in May. 



8. L. Ostry&foliella. Antennas silvery. Front silvery, 

 tuft fuscous and silvery mixed. Thorax silvery, with the 

 basal part of tegulas pale golden. Fore-wings pale golden, 

 with an unmargined, median, silvery basal stripe, and a 

 silvery streak along the basal portion of the inner margin. 

 Fore-wings pale golden, with four silvery costal streaks, all 

 except the last black-margined internally; with two dorsal 

 streaks of the same hue, black-margined internally. The 

 first costal and first dorsal streaks opposite, quite oblique and 



