66 PSY OHE. 
posts and trees, and therefore probably 
does not feed on the pith of living branches. 
Gracilaria negundella. 
This species has heretofore been recorded 
only from Denver, Colorado; but I have 
also found the leaves of the box alder its 
food plant, in Kentucky, rolled into cases 
precisely similar to those made by this spe- 
cies in Colorado, and containing a Gracila- 
ria larva, of which, however, I did not suc- 
ceed in rearing the imago. I have, how- 
ever, no doubt that it is the same species. 
Laverna gleditschiaeella. 
The egg of this species (which I have 
found only by dissection of the female) is 
a very pretty microscopic object. It is 
opaque ; the centre of the larger end pro- 
jects a short distance, and ridges extend 
on every side from the projection to the 
margin, with concave valleys between 
them, and these ridges and valleys are 
continued along. the surface towards the 
smaller end of the egg, but grow gradually 
more indistinct ; they are not straight, but 
have a wavy outline. The egg is depressed 
and narrows gradually towards the smaller 
end, which is somewhat sharply and sud- 
denly rounded: color, white. 
The eggs of Argyresthia undulatella 
Cham., which I have obtained in the same 
way, resemble microscopic hen’s-eggs, ex- 
cept that they are a little more globular. 
Nepticula nyssaefoliella n. sp. 
Only the larva is known, as I have not 
yet succeeded in getting the imago. The 
larva is greenish white with deep green 
contents ; head pale ferruginous with the 
mouth-parts of a deeper green ; the mine is 
linear, ending in a brownish yellow blotch, 
and the frass is attached to the loosened 
upper cuticle. No exuviae were found in 
the mine, and this larva, like most larvae 
of this genus, undergoes no moult until 
pupation. I believe, however, one or two 
instances have been recorded of moults of 
larvae of this genus in Europe. But usu- 
ally the entire larval life does not exceed 
thirty-six hours. 
There is a larva of this genus which is 
not uncommon in hickory leaves (Carya 
alba), in which it makes a large blotch 
mine. ‘The larva itself is rather large for 
the genus, but I have not succeeded in 
rearing the imago. Another hickory Nep- 
ticula which I have not succeeded in rear- 
ing, makes a linear mine about 2.5 cm. 
long, in the first and last fourths of which 
the frass is deposited in a central line, 
while in the middle portion it is deposited 
in transverse rows of small specks, some- 
what as in the mine of the European JN. 
viscerella. 
Nepticula quercicastanella Cham., here- 
tofore bred from leaves of the chestnut oak 
(Quercus castanea), I have also bred from 
leaves of the white oak (Q. alba). 
N. castaneaefoliella Cham., heretofore 
bred from chestnut leaves (Castanea), I 
have also bred from the leaves of white 
oak. 
Dr. Clemens (Tin. N. Amer., p. 172-), 
mentions several other Nepticula larvae 
which have not as yet been bred, and 
besides these there is a species which makes 
a long crooked linear mine in leaves of the 
sugar maple (Acer saccharinum) ; another 
in leaves of sumac (Rhus); another in 
elm leaves (U/mus), and many others ; in 
fact we know comparatively little yet of the 
Nepticula of this country. There is also 
a species mining leaves of hackberry (Cel- 
tis). 
