322 PROCEEDINGS OP THE ACADEMY OP 



The larva mines the leaf of Ostrya Virginica (hop-hornbeam) in Sep- 

 tember. 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. Os try aefol ie'll a. Antennae silvery. Front silvery, tuft fuscous 

 and silvery mixed. Thorax silvery, with the basal part of tegulae pale golden. 

 Fore wings pale golden, with an unmargined, median, silvery basal stripe, and a 

 silvery streak along the basalportion 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 broad at their bases, 

 the second dorsal opposite the second costal streak. The basal streak is moderately 

 broad, and extends quite to the middle of the wing. Apical spot black: hinder- 

 marginal line blackish ; cilia fulvous gray. Hind wings gray, cilia fulvous 

 gray. Abdomen pale fulvous. 



The larva mines the under side of the leaves of Ostrya, and may be found 

 early in July and October. The mine is usually near the margin of the leaf, is 

 flat at first, but is gradually thrown into a fold, the separated epidermis cor- 

 rugated. When completed, the epidermis has changed to a pale brown color. 

 The larva undergoes its transformation in a cocoon composed of "fras3" and 

 silk, in the form of a small ovoid ball suspended within the mine. The larva 

 is cylindrical, with the body pale yellow, colored on the dorsum beyond the 

 third segment, dark green from ingesta. The imago appears in August and 

 May. 



In the same leaf, mining the upper surface in a blotch mine, at first white and 

 subsequently brown, may be found in October a Litbocolletis larva of a different 

 type from the a6ove. It tapers posteriorly, is flattened above and beneath, 

 with the rings distinctly separated and mammillated at the sides ; the first ring 

 is rather abrupt anteriorly and much broader than the head. The head is some- 

 what triangular, flattened and thin, with the mandibles projecting in front as 

 two small, rounded appendages. The head is pale brown, the body of the same 

 hue, with dorsal, dark brown, elliptical maculae, placed transversely on the 

 segments. I have not seen the imago, and refrain from naming the species, lest 

 it may be identical with some one hereafater described. The cocoon is circular, 

 its outline being visible on the upper epidermis as a circle, while beneath it is 

 raised and prominent. 



9. L. lucetiella. Antennae silvery. Head, tuft and thorax silvery. 

 Anterior wings silvery from the base to the middle, and thence to the tip golden, 

 with a golden costal streak from the base not extended to the middle. About 

 the middle of the wing is a silvery band, broadly margined internally with 

 golden, and with a minute black point on the costa internally ; a costal silvery 

 spot, margined internally by a black spot, nearly opposite to which is a large 

 dorsal silvery streak margined internally by an oblique black line ; near the tip 

 is a costal, silvery, unmargined streak curving to the tip ; cilia golden, at the 

 tip and on inner margin silvery. No apical spot nor hinder-marginal line. 

 Hind wings silver gray, cilia the same. Abdomen blackish, tipped with silvery 

 gray. 



The larva mines the underside of the leaf of Tilia Americana (bass 

 wood) in July, September and October. The mine is most frequently nearly 

 square in form, and when completed both cuticles of the leaf are left nearly 

 transparent, and the leaf is not folded. The " frass " is cast on the edges of 

 the mine. It weaves an oval cocoon, thin enough, however, to permit the pupa 

 to be seen through the cuticles. The larva is cylindrical. The head pale brown ; 

 the body pale greenish white, with a series of dorsal brown spots from the third 

 ring posteriorly. The imago appears in August and May. 



10. L. o b st r ic te 1 1 a. Antennae silvery beneath, blackish above, with 



[Nov. 



