48 THE CANADIAN ENTOMOLOGIST. 
white. Thorax and primaries dark iron gray, or brownish ; primaries pale 
whitish gray along the dorsal margin, dusted with brown. A narrow, 
brown streak from the fold, which widens into three small spots, once near 
the base, once towards the middle, and once behind the middle. Seven 
(or eight?) indistinct pale costal streaks, the first before the middle, the 
last close to the apex ; those in the apical part of the wing are longer than 
those about the middle, and extend nearly across the wing, and all are 
internally dark margined. A white spot at the extreme apex, very small, 
and followed by a minute dark brown dot, behind which is an indistinct 
brown hinder marginal line. Ciliae of the general hue. Adar ex. nearly 
74 inch. 
At the bottom of 2. 776, v. 3, ante, | have mentioned a mine on the 
upper surface of the leaves of Haw trees, which resembles that of Lztho- 
colletis Virginiella on the upper surface of Ostrya leaves; and which I 
then supposed to be the mine of an undescribed Lzthocolleiis. (As will be 
hereafter explained, there is no such species as ZL. Virginiella, and the 
supposed mine of that species proved to be the mine of Z. ¢riteneanella. 
(But of that hereafter.) The mine on the wger surface of the Haw leaves 
proves to be that of the O7zix above described. This mine is white, 
with the frass scattered, and much of it attached to the upper cuticle. It 
is large and nearly circular, and when completed the leaf is folded 
upwards. The larva never leaves the mine, but pupates in it, in a brownish- 
red cocoon attached to the upper cuticle. I have never seen it on any leaves 
except those of Crataegus tomentosa, and never on those, except in one 
small piece of woodland containing about ten acres, near Covington, 
Kentucky. There they are very abundant, and I have found multitudes 
of them containing larvae and pupae, and empty ones with the pupa case 
projecting through the upper cuticle, from May to November. Z have 
never met with any other Ornix on the leaves of C. tomentosa. It is a very 
difficult species to rear, as out of at least one hundred mines that I have 
gathered containing the larvae and pupae, I have succeeded in rearing 
but two specimens of the imago. 
Dr. Clemens states that his O. crataegifoliclla has the labial palpi 
whitish; and does not mention the annulus ; and he says that the fore- 
wings have a few whitish streaks zz the apical part of the wing. His 
description is scarcely sufficient to enable one to determine a species 
among those which resemble each other so closely as do many species of 
this genus. But if he had mentioned the annulus on the palpi, and had 
