THE CANADIAN ENTOMOLOGIST. 129 



Alar. ex. }/{. inch. Kentucky. Not common. 



The larva is cylindrical, yellowish, and makes a tent mine on the 

 under surface of the leaves of the Hackberry (Celtis occidentalis.) 



21. — Z. celtisella. N. sp. 



Face, palpi, and under surface silvery white, the under surface and legs 

 tinged with yellowish ; antennae silvery, annulate above with dark brown. 

 Tuft, thorax, and anterior wings saffron-yelloAV, with a white patch in the 

 centre of the tuft and the usual white line across the anterior margin and 

 sides of the thorax, which, however, as in other species, is sometimes 

 wanting. When present it is confluent with the rather long narrow median 

 basal white streak which is faintly dark-margined towards the dorsal mar- 

 gin. Just before the middle is a white fascia angulated near the costa and 

 produced backwards at the angle, and strongly dark-margined internally. 

 Near the base of the cilia? is another straight white fascia not definitely 

 bounded, anteriorly margined with dark brown and with many dark brown 

 scales interspersed in the white, and sometimes divided into two or three 

 rather indefinite spots. The apex of the thorax is white, and from it a 

 narrow white line passes along the posterior margin of the wing to the first 

 fascia, and sometimes is faintly indicated to the base of the ciliae and is 

 margined with dark brown. Apex dusted with dark brown on a white 

 ground, the dusting margined by an oblique white line internally. Some- 

 times the dusting is not thick, and the whole apical half of the wings is 

 sparsely flecked with dark brown scales. The markings of the apical half 

 of the wing are all indefinite, the colors not being separated by distinct 

 well-marked lines, but to some extent running into each other. Al. ex. 

 less than ^ in. Kentucky. Very abundant. There is some variation 

 in the intensity of the color : some species being much paler than others, 

 and one specimen in my possession has the thorax entirely white. 



The larva mines the under surface of the leaves of the Hackberry 

 (Celtis occidentalis). The mine begins near the midrib and the first por- 

 tion of it is only discernible under a lens. It is only by observing this 

 part of it that it is possible to tell on which side of the leaf the larva 

 enters, as the remainder of the mine presents the same appearance on 

 both sides of the leaf. It is a short narrow crooked line ending in a 

 small ovoid dead-looking blotch which is slightly puckered along the 

 centre on both surfaces. Like all other species it leaves the mine upon 

 the same side on which it entered. 



