1G8 Journal New York Entomological Society. [Voi. v. 
green as its ally, but differs in the absence of the transverse yellow line 
on joint 3. 
The eggs are laid singly on the lower branches of the oak, its only 
food plant. The larvae feed in Stage I eating the parenchyma from be¬ 
low in little patches. The moths emerge at the end of June, my exam¬ 
ples all appearing between the 25th and 29th of that month. The 
males separate from the females before morning and are not found in 
copulation during the day. The species is single brooded, mature 
larvae occurring in the middle of August and into September. 
This is the larva originally described by me as A. y-inversa. (See 
Journ. N. Y. Ent. Soc. Ill, 153 and V, 2 .) I found them rarely at 
Plattsburgh, Clinton Co., and on Esopus Island in the Hudson River 
opposite Hyde Park, Dutchess Co. They were unusually abundant at 
Lellport, Long Island, in the summer of 1896 and I bred them in some 
numbers with the kind assistance of Mr. L. H. Joutel, who kept the 
cocoons over winter for me. 
Description of the Several Stages in Detail. 
-Egg- —Elliptical, rather opaque whitish, white on both glass and 
leaf; 1.2 x .7 mm. Reticulations very small and obscure, irregularly 
quadrangular. They hatch in 7 to 8 days. 
Stage /. (Plate IX, fig. 1.)—Distinctly segmented, opaquish white, 
the spines whiter. Rounded and narrowed behind, truncate before, 
highest in front. Dorsal and lateral spaces moderate, flat, not hol¬ 
lowed ; ridges slight. No marks except a large black spot on the head, 
which consists of a patch of pigment below the skin of joint 2 and is 
visible even to the naked eye. Head smoky, especially on the vertex, 
die sutures of clypeus black; mouth brown, a pale area around it. 
When retracted, the head looks black. Setae long, slender with broad¬ 
ened bases, tapering, the subdorsal row of joints 4-12 with distinct side 
prongs, one-third the length of the other limb. Tips enlarged and 
cleft. Basal two-thirds of seta milky white, apex transparent, smooth, 
becoming black. On joint 3 five setae, the same on joint 4 but the 
upper two consolidated. The lateral seta of joint 5 leans upward and 
the subdorsals of joints 5> 7 > 9 an d 11 lean outward, alternating with 
the others. Two simple subdorsal setae on joint 13. Skin smooth, 
slightly shining. Later the larva is very shiny, a hollow appears above 
the base of each subdorsal tubercle in the dorsal space and a distinct 
white line under the skin along subdorsal and lateral ridges. Spines 
no longer conspicuously white. Length .9-1.5 mm. The larvae feed 
in this stage. Duration about 5 days. 
