168 Journal New York Extomological 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, 15^ 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 

 Bellport, 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 I. (Plate IX, fig. i.) — 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, 

 dhe 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 and 11 lean outward, alternating with 

 the others. Two simple subdorsal sette 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. 



