LEPIDOPTERA OF NEW YORK AND NEIGHBORING STATES 667 



ined, very shortly stalked (fig. 422). Hind wing more or less extended at inner 

 margin, and sometimes lobed. 



Larvae (fig. 424) with long cylindrical subdorsal horns on mesothorax, in all 

 stages, and with the other horns reduced to short spines or nodules, longest in 

 A. stigma. Pupa very rough and spiny, with a strong serrate ridge across middle 

 of segment eight of abdomen ; formed in the ground. 



The moths of the three latter species are not always distinguishable, but the 

 larvae are strikingly different. 



Key to the species 

 (Adult) 



1. No discal spot 1. rubicunda. 



1. A white discal spot. 



2. Males (antennae pectinate). 



3. Fore wing opaque, and sprinkled with brown dots 2. stigma. 



3. Fore wing translucent on disc, and not sprinkled. 



4. senatoria, 3. virginiensis. 

 2. Females (antennae simple). 



3. Fore wings translucent, not sprinkled with brown dots. . . .3. virginiensis. 

 3. Fore wings opaque, sprinkled with brown dots 2. stigma, 4. senatoria. 



( Larva ) 



Green 1. rubicunda. 



Yellow-brown 2. stigma. 



Pink and gray 3. virginiensis. 



Black and yellow 4. senatoria. 



I. Moth without discal dot; larva with short spines, pupa with hooked spines on 

 antennal shaft ( Dryocampa ) . 



1. A. rubicunda Fabricius (Spiny mapie worm). Bright straw yellow (nearly 

 white in the western variety alba Grotej, with broad diffuse pink ante- and post- 

 medial lines, or (in the eastern form only) with the basal and outer thirds more 

 or less completely filled with pink; hind wing with a slight pink postmedial shade, 

 or wholly yellow. Male 40, female 50 mm. (H 8:11.) 



One brood in the north (June and July), two broods southward (May and June; 

 August). Caterpillar striped in two. shades of green, with a pink subventral bar 

 toward tail; spines black; feeding on maple, rarely in injurious numbers, occa- 

 sional on oak. Just before pupation the caterpillar turns dark brown with 

 obscure transverse banding. 



Generally distributed, north to Quebec. New York: general. 



II.. Moth with, white discal dot; larva often with long supines; pupa with "blunt 

 tubercles on antennal shaft (Anisota). 



2. A. stigma Fabricius. Sexes nearly alike, but wings a little squarer in male. 

 Bright ochre yellow, dotted with brown, often heavily; outer margin sometimes 

 with a little gray-brown shading. Antemedial band obscure, postmedial straight, 

 on fore wing running almost to apex, somewhat diffuse. Male 45, female 60 mm. 

 (H 11:9 male, 10 female.) 



One and two broods, the first in May and June. Caterpillar dull yellow-brown, 

 granulated with white secondary tubercles, without distinct stripes; smaller 

 spines strong, even on prothorax. Food, oak, and rarely, hazel. 



Massachusetts to Ontario, Illinois, Kansas, and south. New York: Karner, 

 Lansingburg, Poughkeepsie, Staten Island, Brooklyn. Records in this genus to be 

 quite safe should be based on the larva. 



