Sep'. 1898.] Kunze: Two Forms of Cerura nivea. 191 
larval differences of nivea and cinerea. The dorsal ornamentation of larva of nivea 
is bordered by a feint yellow line. Dorsal patch of joints 6, 7, 8 and 9, diamond- 
s aped, bluish-white on median line, edged rosy lilac when viewed in certain light 
and bordered }ellowish. All diamond shaped patches much constricted near place 
of union. The patch of segments 10 and 11, also diamond shaped and in coloration 
like preceding. On segments 4 and 5, the yellowish border of dorsal patch is almost 
confluent, a trace of lilac tint between it. Joint 12, has a median lilac line which 
widens on joint 13, to form a smaller diamond patch reaching to veDter. This dorsal 
patch is more lilac on median surface than the other. A brown elevate d spot now marks 
tbe place of former prothoracic processes. Supra and in'ra<piracular surface light 
green, spotted and speckled lilac and yellowish over entire parts, as far down as 
eet. These spots vary from ovoid to hemispherical. Below the yellowish border of 
dorsal ornamentation of posterior half of body, the green color of larva is lighter 
tinted, spiracles brown, white centered. Thoracic feet yellow, laterally spotted brown 
and sparingly pikse. Abdominal feet pilose, clasping surface white, and just above a 
brown lunulate mark covered by 6-8 hairs. Abdominal surface concoloring with 
lateral parts. Dorsal and lateral surface smooth. Stemapods have lost the bright 
color of previous stage. Spinose, with setae now very short. 
• ; C0< - 00 "— Co]or > dark drab - Shape, elliptical, very little flattened, strong, not 
indented by finger. Size, length, 24 mm ; width across central area, 9 mm. 
On the night of October 22c], this larva only 26 days old. com¬ 
menced to make its cocoon. The only one other example of this brood 
for five or six days tried hard to transform and failed, so that finally I 
made an alcoholic specimen of it for Professor Packard. 
WHITE FORM OF CERURA NIVEA. 
The accumulated evidence referred to under this heading should be 
accredited to the whitest form of an Arizona cerurine, heretofore known 
as a variety of cinerea. The example from which bred, a female as 
white as the driven snow, was ornamented with a minute, black spot 
between each vein on external margin of primaries. The antennae 
showed very little black, which was confined to the branches, all else¬ 
where a spotless white. The insect was secured at light in this city. 
Confined in a small paper box, I obtained 65 ova, all laid singly, of 
which about fifty hatched October 8, 1897. In color and size, as well 
as shape, the ova were black and hemispherical like those of the pre¬ 
vious female referred to. Of this brood about 33 reached maturity, and 
besides reserved two examples of every stage in alcohol for the use of 
Professor Packard. A full-grown larva or nearly so, by the time it ar¬ 
rived in Providence, R. I., was sent alive, and of which the doctor 
wrote me, Mr. Joutel made a beautiful figure. Of the earlier stages I 
